EP4048935A1 - Tank for storing natural gas in a liquid state aboard a vessel - Google Patents
Tank for storing natural gas in a liquid state aboard a vesselInfo
- Publication number
- EP4048935A1 EP4048935A1 EP20793001.7A EP20793001A EP4048935A1 EP 4048935 A1 EP4048935 A1 EP 4048935A1 EP 20793001 A EP20793001 A EP 20793001A EP 4048935 A1 EP4048935 A1 EP 4048935A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- plane
- wall
- angular
- angular junction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title description 24
- 239000007788 liquid Substances 0.000 title description 14
- 239000003345 natural gas Substances 0.000 title description 12
- 230000000284 resting effect Effects 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims description 62
- 239000003351 stiffener Substances 0.000 claims description 61
- 238000004078 waterproofing Methods 0.000 claims description 49
- 239000003949 liquefied natural gas Substances 0.000 claims description 46
- 230000004888 barrier function Effects 0.000 claims description 39
- 230000003014 reinforcing effect Effects 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 40
- 230000002787 reinforcement Effects 0.000 description 8
- 238000003860 storage Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000011120 plywood Substances 0.000 description 5
- 239000013521 mastic Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/08—Mounting arrangements for vessels
- F17C13/082—Mounting arrangements for vessels for large sea-borne storage vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/025—Bulk storage in barges or on ships
- F17C3/027—Wallpanels for so-called membrane tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0147—Shape complex
- F17C2201/0157—Polygonal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/052—Size large (>1000 m3)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0304—Thermal insulations by solid means
- F17C2203/0358—Thermal insulations by solid means in form of panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/033—Small pressure, e.g. for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0102—Applications for fluid transport or storage on or in the water
- F17C2270/0105—Ships
- F17C2270/0107—Wall panels
Definitions
- the present invention relates to the field of natural gas tanks in the liquid state in maritime transport.
- Liquid natural gas is transported by sea in sealed and thermally insulating storage tanks on transport ships. Natural gas is kept in liquid form to increase the amount of natural gas transported per tank, the volume of one liter of natural gas in liquid form being much less than the volume of one liter of natural gas in gaseous form. These tanks maintain the liquid natural gas at very low temperature, and more precisely at a temperature below -163 ° C, temperature at which the natural gas is in liquid form at atmospheric pressure.
- Such liquid natural gas tanks can also be used as a reservoir by some ships. In other words, ships load and store liquid natural gas in their tanks and then use the liquid natural gas as fuel.
- Liquid natural gas tanks generally have a parallelepipedal shape, the walls of which are carried by the internal hull of the ship in which the tank or tanks are installed. More particularly, the hulls of ships on which the tanks are loaded include an outer hull in contact with the external environment of the ship, and an internal hull used as a supporting structure for the tanks. Stiffeners extend between the outer shell and the inner shell to support the inner shell, as well as the walls of the vessel (s).
- liquid natural gas exerts pressure on the walls of the tank.
- the previously mentioned stiffeners make it possible to ensure that the walls withstand this pressure.
- the junction zones of the walls of the tank, or in other words the corners of the parallelepipedal shape of this tank, can very particularly be weakened by this pressure and it is necessary to ensure the tightness of the tank in these. junction areas of the walls, in order to to avoid contamination of the vessel wall by liquid natural gas, or even in certain cases a leak from the storage vessel leading to a loss of the stored liquid natural gas.
- the present invention firstly relates to a sealed and thermally insulating tank capable of resting on a supporting structure of a ship, the sealed tank comprising a plurality of tank walls including a first tank wall and at the bottom. least a second vessel wall, the first vessel wall extending mainly in a first plane and the second vessel wall extending mainly in a second plane, the first plane and the second plane being perpendicular to each other the other, the first tank wall and the second tank wall being linked by an angular junction piece, characterized in that the angular junction piece has a first portion extending mainly in a plane parallel to the first plane, a second portion extending mainly in a plane parallel to the second plane and at least one intermediate portion extending mainly in a plane secant to the first plane and the second plane, the first 1st portion of the angular junction piece having a thickness equivalent to that of the first tank wall and extending in the extension of this first tank wall and the second portion of the angular junction piece having a thickness equivalent to
- the vessel is intended to receive liquid natural gas, the natural gas having to be at a maximum temperature of -160 ° C. in order to be kept in its liquid form at atmospheric pressure.
- the tank comprises a succession of layers ensuring firstly the maintenance of the liquid natural gas at a temperature of at most -160 ° C and secondly maximum sealing to reduce the risk of leakage of the liquid natural gas.
- This tank can in particular be used for storing liquid natural gas during navigation or while awaiting its unloading at the quay, for example, or even be used to supply the machinery of the ship on which the tank is on board.
- Such a temperature of liquid natural gas can increase if it is kept in the tank at a pressure greater than the pressure. atmospheric.
- the tank can be operated at a pressure of 1 bar gauge and in such a case, the natural gas will be maintained in the liquid state at a maximum temperature of -152 ° C.
- the tank is supported by the internal hull of the vessel, which forms the supporting structure, because this tank with a membrane is not a self-supporting structure.
- the internal shell is provided to house the tank and withstand the pressure exerted by the liquid natural gas stored in the tank on the walls of the tank.
- the tank has at least two walls, the two walls being perpendicular to each other.
- the stored liquid natural gas exerts a pressure on each of these walls and the structure of the tank with the junction part according to the invention makes it possible to manage the pressure exerted at the level of the junction zone between the two walls, in order to limit the risk of liquid natural gas leakage at this junction zone.
- the junction piece is particular in that it has three parts among which two parts here called the first portion and second portion, are respectively arranged in a plane parallel to the extension plane of one of the side walls of the tank, and a third part, here called intermediate portion, is inclined relative to each of the other parts.
- This third part forms an intermediate part, arranged between the other two parts, which is configured to distribute the pressures exerted by the liquid natural gas in the direction of each of the side walls of the vessel.
- the angular junction piece and / or the angular junction element have a similar or substantially similar thickness, except for manufacturing clearances, to the thickness of the first tank wall and / or to the thickness of the tank.
- the angular junction piece ensures structural continuity of the tank at a corner of the tank, making a structural link between two perpendicular side walls mainly forming the tank but which does not show no continuity with respect to each other.
- the sealed tank comprises at least one third tank wall extending mainly in a third plane perpendicular to the first plane, to the second plane and to the secant plane, and having a junction zone with the first tank wall and the second tank wall, in which the junction zone comprises an angular junction element, the angular junction element comprising a first part and a second part, the first part having a first section extending mainly in the first plane, a second section extending mainly in the second plane and an intermediate section extending mainly in the secant plane, the second part having a return wall perpendicular to the first part and extending mainly in the third plane.
- the third tank wall extends in a plane perpendicular to the extension plane of the first tank wall, to the extension plane of the second tank wall as well as to the extension plane of the first portion, of the second portion and the intermediate portion of the junction piece.
- the junction element thus ensures the connection between the third tank wall and the first tank wall, the second tank wall and the junction piece, thanks to a first part extending in the extension planes of the first vessel wall, the second vessel wall, as well as the angular junction piece, and thanks to a second part extending in the extension plane of the third vessel wall.
- the angular junction element also ensures the distribution of the pressure exerted by the liquid natural gas on the internal face of the vessel at the level of the connection zone of the first vessel wall, of the second vessel wall and of the third. tank wall.
- the angular junction piece and / or the angular junction element each have an internal face and an external face, the internal face forming an internal chamfer at the level of the intermediate portion or at the level of the intermediate section and the external face forming an external chamfer at the level of the intermediate portion or at the level of the intermediate section, the internal and external chamfer inclining at an angle of between 120 ° and 150 ° with respect to the foreground and to the second plan.
- the third part, that is to say the intermediate portion, of the junction piece between the first tank wall and the second tank wall is advantageously inclined at an angle of 135 °, plus or minus 15 ° , with respect to each of the extension planes of the first part and of the second part of the junction piece, respectively called the first portion and the second portion, so that the distribution of the pressure exerted by the liquid natural gas is as well carried out on one or the other of the side walls linked by the junction piece.
- the third part of the junction piece between the first tank wall and the second tank wall is inclined at 135 °, plus or minus 15 °, with respect to each of the extension planes of the first part and the second part of the connecting piece.
- the dimension of the intermediate portion of the angular junction part measured between the first portion and the second portion of said part, and / or the dimension of the intermediate section of the junction element angular measured between the first section and the second section of said element increases while going from the internal face towards the external face.
- the internal surface and more particularly the internal chamfer as it could be mentioned previously, is less wide than the external surface, and more particularly the external chamfer, the width being understood as the dimension perpendicular to the longitudinal direction along which mainly extends the junction piece.
- the angular junction piece and / or the angular junction element successively comprise in the direction of the thickness from the outside to the inside of the sealed tank, a thermally insulating barrier secondary capable of being in contact with the supporting structure, a secondary waterproofing membrane carried by the secondary thermally insulating barrier, a primary thermally insulating barrier resting against the secondary waterproofing membrane and a primary waterproofing membrane carried by the thermally barrier primary insulator and intended to be in contact with the fluid contained in the sealed tank.
- the vessel walls as well as the junction parts of the liquid natural gas storage vessel are composed of at least one secondary space and one primary space, the secondary space of the vessel wall rests on the internal shell of the tank. ship through mastic rods.
- the secondary space is composed, successively from the outer face to the inner face of the tank, of a secondary thermal insulation barrier and a secondary waterproofing membrane.
- the primary space is for its part made up, successively from the outer face of the tank to the inner face of the tank, of a primary thermal insulation barrier and a primary waterproofing membrane.
- the secondary space of a junction piece composed of at least one secondary thermal insulation barrier and of a secondary waterproofing membrane, is arranged in the extension of the secondary space of the tank wall which it extends, these two secondary spaces being of the same constitution.
- the primary space of a junction piece composed of at least one primary thermal insulation barrier and a primary waterproofing membrane, is arranged in the extension of the primary space of the tank wall. that it extends, these two primary spaces being of the same constitution.
- the thermal insulation barriers help maintain the temperature of the liquid natural gas stored in the storage tank by limiting heat exchange between the environment outside the storage tank and the inside of the storage tank.
- the waterproof membranes prevent any leakage of liquid natural gas.
- the secondary thermally insulating barrier and the secondary sealing membrane of the angular junction part and / or of the angular junction element have, in a given direction, a greater dimension than the corresponding dimension, in the same direction, of the primary thermally insulating barrier and of the primary waterproofing membrane.
- the first portion of the angular junction piece extends mainly in the first plane of the intermediate portion along a vertical direction.
- the dimension of the secondary space measured along the vertical direction is greater than the dimension of the primary space also measured along the vertical direction at the first portion. This applies similarly to the first section of the angular junction element.
- the second portion of the angular junction piece extends mainly in the second plane of the intermediate portion along a transverse direction.
- the dimension of the secondary space measured along the transverse direction is greater than the dimension of the primary space also measured along the transverse direction at the second portion. This applies similarly to the second section of the angular joint member.
- the first portion, the second portion and the intermediate portion of the angular junction piece extend along a longitudinal direction common to the three portions.
- the dimension of the secondary space measured along the longitudinal direction is greater than the dimension of the space measured also along the longitudinal direction at each of the portions of the angular junction piece. This applies similarly to each of the sections of the angular joint member.
- the secondary space is uncovered leaving the secondary waterproofing membrane free.
- a primary space panel is then positioned so as to simultaneously overlap the first portion of the junction piece and the first tank wall, the panel thus making the junction element and this first wall integral. tank.
- the same assembly is used between the second portion of the junction part and the second tank wall as well as at the level of the first section, the second section and the return wall of the angular junction element.
- the deflection wall extends in a plane perpendicular to the first plane, to the second plane and to the secant plane and parallel to the vertical and transverse directions.
- the dimension of the secondary space measured along the vertical direction is greater than the dimension of the primary space also measured along the vertical direction at the return wall.
- the dimension of the secondary space measured along the transverse direction is greater than the dimension of the primary space also measured along the transverse direction at the return wall.
- a dimension of the first portion and / or of the second portion of the angular junction piece has a value equivalent to that of the dimension of the intermediate portion.
- the subject of the invention is also a vessel comprising at least one sealed tank as described above.
- the ship comprises an outer hull and a supporting structure, the supporting structure being intended to house the sealed tank, the supporting structure having a first bearing wall extending mainly along the foreground and a second bearing wall extending mainly along the second plane, the first bearing wall and the second bearing wall being substantially perpendicular, characterized in that a clearance zone is provided between the bearing walls of the supporting structure in the junction zone and the intermediate portion of the angular junction piece, and in that a reinforcing element is housed in said clearance zone.
- This reinforcing element makes it possible to provide a bearing face for the angular junction piece which is substantially perpendicular to the direction of the pressure exerted by the liquid natural gas present in the vessel at the level of the junction zone of the vessel walls. .
- the reinforcing element has a triangular shaped section, the reinforcing element having a vertex whose angle is equivalent to the right angle formed between the first bearing wall and the second bearing wall, the reinforcing element having a contact face with the intermediate portion which is opposite to this apex.
- the contact face of this reinforcing element may have a planar shape and form a square such that during contact between the reinforcing element and the intermediate portion of the angular junction piece, the stresses are evenly distributed over the entire contact face forming the support face.
- this contact face could have a faceted profile, being formed of a plurality of flat surfaces inclined with respect to each other so as to tend towards a profile curved towards the inside of the reinforcement element. .
- this contact face may have a curved profile with a generally concave shape of the reinforcing element.
- reinforcements and / or leveling material could be placed in the space thus formed between the contact face and the intermediate portion of the angular junction part.
- the outer shell has a plurality of stiffeners in contact with the supporting structure, the concentration of stiffeners being reduced near the angular junction piece and / or near the junction element angular.
- the distance between two neighboring stiffeners of a plurality of stiffeners arranged between the outer shell and the supporting structure varies depending on whether one is near or far from the angular junction piece, this distance being greater when we approach the angular junction piece.
- a dimension of the intermediate portion of the angular junction piece is determined as a function of the position of the stiffener closest to a corner of the internal bearing structure in which the piece of support is positioned. angular junction, so that with D60 the dimension of the intermediate portion, and d the distance between the first stiffener and the corner of the internal load-bearing structure.
- the dimension mentioned of the intermediate portion corresponds to the length of the outer face of this intermediate portion between a first bonded edge forming a junction between the intermediate portion and the first portion and a second bonded edge forming a junction between the intermediate portion and the second portion.
- FIG. 1 is a side view of a transport vessel showing at least one tank of natural gas in a liquid state;
- FIG. 2 is a sectional view of the schematic representation of a tank comprising at least one angular junction piece arranged between the various side walls of the tank and of a shell comprising an outer shell, stiffeners and an internal supporting structure inside. of which the tank is housed;
- FIG. 3 is an interior view of a plurality of connecting pieces
- FIG. 4 is a cross section of a tank, the internal supporting structure and the outer shell at the connection of two side walls of the tank;
- FIG. 5 is a view of the interior of the vessel of an angular junction element and a first transverse vessel wall
- FIG. 6 is a view of the interior of the vessel of at least one angular junction piece and at least one angular junction member;
- FIG. 7 is a cross section of a particular embodiment of the tank, of the internal supporting structure, of the stiffeners and of the external shell, in a representation similar to that of FIG. 4;
- FIG. 8 illustrates a variant of the embodiment of FIG. 7.
- the characteristics, variants and the different embodiments of the invention can be associated with each other, in various combinations, insofar as they are not compatible or exclusive with respect to each other. It is in particular possible to imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage and / or to differentiate the invention. compared to the state of the prior art.
- a transport vessel 200 for example an LNG carrier, which comprises four tanks 26 for the transport or storage of liquefied natural gas, one of these tanks being made visible here to facilitate understanding.
- the transport vessel 200 can be configured to only store and transport this liquefied natural gas, or to use it as fuel for the operation of the vessel.
- a vessel has a hull 2 comprising at least one outer hull 4 and an internal supporting structure 6, between which extend a plurality of stiffeners 8, 10.
- the outer hull 4 is in contact with the external environment of the ship, generally a maritime and / or river environment.
- the internal supporting structure 6 extends away from this external shell.
- stiffeners determines the distance between the outer shell 4 and the internal supporting structure 6, each stiffener being integral with the outer shell 4, at a first end 12, and in contact with the internal supporting structure 6, at the level of a second end 14. It will be understood that stiffeners are advantageously present on the whole of the internal supporting structure 6.
- the internal bearing structure 6 comprises a plurality of bearing walls, including a first bearing side wall 18 and at least one second bearing side wall 20 which extend in perpendicular planes.
- the first bearing side wall 18 comprises a first longitudinal side 21 and the second bearing side wall 20 comprises a second longitudinal side 23 at the level of which the second bearing side wall 20 is adjacent to the first bearing side wall 18.
- first bearing side wall 18 and the second bearing side wall 20 are thus perpendicular to each other at the level of a junction zone 24 between the first longitudinal side 21 of the first bearing side wall 18 and the second longitudinal side 23 of the second bearing side wall 20.
- the internal supporting structure 6 houses at least one sealed and thermally insulating tank 26, said tank 26 being intended to receive liquid natural gas.
- the sealed and thermally insulating tank 26 has an internal face 27, which is in contact with the liquid natural gas when it is stored in the sealed and thermally insulating tank, and an external face 29, resting on the plurality of bearing walls, and in particular the first or second bearing side wall 18, 20, of the internal supporting structure 6.
- the sealed and thermally insulating tank 26 advantageously extends in the form of a rectangular parallelepiped.
- the sealed and thermally insulating vessel 26 thus has a plurality of vessel walls, including a first vessel side wall 30 and at least one second vessel side wall 32.
- Each of the vessel side walls 30, 32 rests against a corresponding bearing side wall 18, 20. More particularly here, in the example illustrated, the outer face 29 of the first side wall of tank 30 rests on the first side wall of bearing 18 of the internal supporting structure 6 and the outer face of the second side wall of tank 32 rests on against the second bearing side wall 20 of the internal supporting structure 6. It follows from the foregoing that the second vessel side wall 32 and the first vessel side wall 30 extend in planes perpendicular to each other with respect to the other.
- the first side vessel wall 30 and the second side vessel wall 32 are connected to each other by being jointly integral with at least an angular junction piece 34 according to the invention which extends at the level of the junction zone 24 previously mentioned.
- the angular junction piece 34 forms an extension of each of the side walls of the tank by having a similar thickness, or substantially similar, except for manufacturing clearances, to that of the first side wall of tank 30 and / or of the second side wall of tank 32.
- the angular junction piece makes it possible to generate structural continuity of the tank by making a link between two perpendicular side walls mainly forming the tank but which do not have any continuity with respect to each other.
- the thickness of one or the other of the side walls of the vessel 30, 32 is here measured, along a direction perpendicular to the plane in which mainly extends the side wall of the vessel 30, 32 concerned, between the internal face 27 and the external face 29.
- the thickness of the first side wall of the tank 30 is measured along a direction parallel to the transverse axis B and the thickness of the second. vessel side wall 32 is measured along the vertical axis C.
- a first portion of the angular junction piece is arranged in the extension of the first side wall of tank 30, said first portion and said first side wall of tank having thickness values, respectively measured along axes mutually parallel, here parallel to the transverse axis B, similar or substantially similar to one another.
- a second portion of the angular junction piece is arranged in the extension of the second side wall of tank 32, said second portion and said second side wall of tank having thickness values, respectively measured along parallel axes. between them, here parallel to the vertical axis C, similar or substantially similar to one another.
- the angular junction piece 34 has a first thickness similar to the thickness of the first side wall of vessel 30 at least at the level of a contact zone between the angular junction piece 34 and the first side wall of vessel 30. , and a second thickness similar to the thickness of the second side wall of the tank 32 at least at an area contact between the angular junction part 34 and the second side wall of the tank 32.
- the angular junction piece 34 comprises, successively from the outer face to the inner face, a secondary thermal insulation barrier 36, a waterproofing membrane secondary 38, a primary thermal insulation barrier 40 and a primary waterproofing membrane 42.
- the secondary thermal insulation barrier 36 and the secondary waterproofing membrane 38 form a secondary space 37 and the primary thermal insulation barrier 40.
- the primary waterproofing membrane 42 form a primary space 41.
- the primary space, formed of the primary thermal insulation barrier 40 and of the primary waterproofing membrane 42, of the part of angular junction extends both in the extension of an equivalent primary space of the first side wall of tank 30 and in the extension of an equivalent primary space of the second side wall of tank 32, and that other apart from the secondary space, formed of the secondary thermal insulation barrier 36 and of the secondary waterproofing membrane 38, the angular junction piece extends both in the extension of an equivalent secondary space of the first side wall of tank 30 and in the extension of an equivalent secondary space of the second side wall of tank 32.
- the secondary thermal insulation barrier 36 comprises, successively from the external face of the tank towards the secondary waterproofing membrane 38, a first insulation wall 44 and a first layer of thermal insulation 46.
- the first insulation wall 44 comprises a board having substantially the shape of a rectangular parallelepiped.
- the board is advantageously made of plywood, for example wood plywood.
- the dimensions of the board are adapted to the size of the blocks of the secondary thermal insulation barrier 36.
- the first layer of thermal insulation 46 may be formed by a cellular plastic material, such as a polyurethane foam for example, allowing effective thermal insulation and well distributed between the insulation walls.
- the angular junction piece 34 comprises a second insulating wall 51 arranged to cover the first layer of thermal insulation 46, between this first layer and the secondary waterproofing membrane 38.
- This second insulating wall 51 also formed of a plank advantageously in plywood, for example a wood plywood, is specifically arranged in the angular junction piece, without it necessarily being provided in the composition of the tank walls.
- This second insulation wall 51 is in particular provided for better resistance to the pressure generated on the wall junctions by the natural gas present in the tank.
- the secondary thermal insulation barrier 36 and more particularly the second insulation wall 51, is integral with the secondary waterproofing membrane 38, for example by gluing.
- the secondary waterproofing membrane 38 includes a flexible secondary waterproofing membrane 48 and a rigid secondary waterproofing membrane 49.
- a rigid secondary waterproofing membrane 49 is specific to each portions 56, 58, 60 of the angular junction piece 34 and a flexible secondary waterproofing membrane 48 is common to all of the portions, by overlapping at least partial of each of the rigid secondary waterproofing membranes 49 which covers the secondary thermally insulating barrier 36 at the level of the flat surfaces. It will be understood that the secondary thermally insulating barrier of each portion of the angular junction piece 34 is covered by the rigid secondary waterproofing membrane 49, but that the intersections between each of the portions remain uncovered.
- the flexible secondary waterproofing membrane 48 is positioned overlapping the intersections between each of the portions 56, 58, 60 of the angular junction piece 34 and between each rigid secondary waterproofing membrane 49 covering said portions 56, 58, 60, decreasing the risk of contamination in these risk areas.
- the flexible secondary waterproofing membrane 48 is a triplex strip, composed of an aluminum sheet bonded between two braided glass mats, these components of the triplex strip not being shown in all of the figures.
- the flexible secondary waterproofing membrane 48 is on the one hand in contact and bonded to the rigid secondary waterproofing membrane 49 and, on the other hand, to the primary thermal insulation barrier 40.
- the rigid secondary waterproofing membrane 49 consists of an aluminum foil bonded between two braided glass mats impregnated with a polymer resin.
- the primary thermal insulation barrier 40 comprises a second thermal insulating layer 52 and a third insulation wall 54 and reference may be made to the above for the composition and function of each of these layers.
- the angular junction piece 34 and the plurality of tank walls are mounted by means of the assembly panels, arranged one beside the other and each comprising the different elements. constituents of the angular junction part 34 and of the plurality of vessel walls.
- These assembly panels can be covered with the primary waterproofing membrane 42, which can be stainless steel with waves. It should be noted that, alternatively, the primary waterproofing membrane 42 is, for example, made of invar® sheet.
- the side walls of the tank 30, 32 each extend along a main elongation plane, these elongation planes being perpendicular to each other and the angular junction piece 34 extends in three different planes, the angular junction piece 34 having at least three different portions extending respectively in one of these three different planes.
- the angular junction piece 34 comprises a first portion 56, a second portion 58 and at least one intermediate portion 60.
- the number of intermediate portions is not limiting, and it should be imagined according to l invention an angular junction piece 34 having for example four portions with two intermediate portions connecting to one another the first portion 56 and the second portion 58.
- the first portion 56 extends the intermediate portion 60 in a vertical direction, substantially parallel to a vertical axis C
- the second portion 58 extends the intermediate portion in a perpendicular transverse direction, substantially parallel to a transverse axis B.
- the first portion 56 and the second portion 58 each have primary 41 and secondary 37 spaces which do not extend over the same dimension, in a given direction, from the intermediate portion.
- the dimension of the primary space 41 of the first portion 56 measured along the vertical direction is shorter than the dimension of the secondary space 37 of this first portion 56 also measured along of the vertical direction so that the primary space 41 does not entirely cover the secondary space 37.
- the dimension of the primary space 41 of the second portion 58 measured along the transverse direction is shorter than the dimension of the secondary space 37 of this second portion 58 also measured along the transverse direction so that again, the primary space 41 does not entirely cover the secondary space 37
- the first portion 56 of the angular junction piece 34 extends mainly in the main extension plane of the first side wall of the tank 30, so as to extend this first side wall of the tank.
- the first portion 56 has a first free edge 62 and a second free edge 64, these two free edges extending opposite to the intermediate portion 60 and being differentiated by the difference in length of the primary and secondary spaces. More particularly, the primary space 41 of the first portion 56 participates in forming the first free edge 62 and the secondary space 37 of the first portion 56 participates in forming the second free edge 64.
- the sealing membrane secondary 38 is discovered on the first portion 56 of the angular junction piece 34, from the first free edge 62 to the second free edge 64, and aims to be covered by the primary thermal insulation barrier 40 of the first side wall tank 30.
- the first portion 56 extends structurally and with a thickness similarly the first side wall of the tank 30 at least along the vertical axis C towards the intermediate portion 58.
- the secondary space 37 constituting the first portion 56 extends, here vertically, the secondary space 37 constituting the the first side wall of the tank 30, and the primary space 41 constituting the first portion 56 extends in the same vertical direction the primary space 41 constituting the first side wall of the tank 30.
- the primary waterproofing membrane 42 and the secondary waterproofing membrane 38 are continuous between the first portion 56 of the angular junction piece 34 and the first side wall of the vessel 30.
- the second portion 58 of the angular junction piece 34 extends mainly in the plane.
- the second portion 58 of the angular junction piece 34 extends structurally and with a similar thickness the second side wall of the tank 32 along the transverse axis B towards the intermediate portion 58.
- the secondary space 37 constituting the second portion 58 extends, here transversely, the secondary space 37 constituting the second side wall of the tank 32 and the primary space 41 constituting the second portion 58 extends in the same transverse direction the primary space 41 constituting the the second side wall of the tank 32.
- the primary sealing membrane 42 and the secondary sealing membrane 38 are continuous between the second portion 58 of the angular junction piece 34 and the second side wall of the tank 32.
- the first portion 56 and the second portion 58 of the angular junction piece 34 extend in planes perpendicular to each other.
- the first portion 56 is not adjacent to the second portion 58, due to the presence of the intermediate portion 60 of which the first portion 56 and the second portion 58 of the angular junction piece 34 are respectively integral.
- the first portion 56 is integral with the intermediate portion 60 at a first bonded edge 66
- the second portion 58 is integral with the intermediate portion 60 at the level of a second bonded edge 72.
- the intermediate portion 60 extends mainly in an inclined plane which is on the one hand secant to the main plane of elongation of the first portion 56 and on the other hand secant to the main plane of elongation of the second portion 58.
- the edges linked 66, 72 previously mentioned form the junctions between each of the portions and each of the corresponding main planes.
- the intermediate portion 60 forms an inclined wall relative to the two portions arranged respectively in the extension of one of the side walls of the vessel perpendicular to each other.
- the inclined plane in which the intermediate portion mainly extends has an angle of approximately 135 ° with, on the one hand, the first portion 56 and the first side wall 30 which it extends and on the other hand the second portion 58 and the second side wall 32 which it extends.
- the dimension measured between the first portion 56 and the second portion 58 of the intermediate portion 60 increases from the internal face 27 towards the external face 29 of the sealed and thermally insulating tank 26.
- the dimension of the intermediate portion 60 between the first bonded edge 66 of the first portion 56 and the second bonded edge 72 of the second portion 58 at the level of the internal face 27 is smaller than the dimension of the intermediate portion between the first bonded edge 66 of the first portion 56 and the second bonded edge 72 of the second portion 58 at the outer face 29.
- the purpose of the angular junction piece 34 according to the invention is to optimize the distribution of the pressure exerted by the liquid natural gas, the pressure being represented by an arrow D in FIG. 4, on the junction zones 24 of the constituent walls. of the plurality of tank walls of the sealed and thermally sealed tank insulating 26.
- the pressure exerted by the liquid natural gas present in the tank 26 on the internal face 27 at the level of the first portion 56 or of the second portion 58 is exerted on the corresponding first space 41 of the angular junction piece 34, and it is distributed in the direction of the outer face 29 over the whole of the corresponding second space 37, that is to say over a larger area.
- the angular junction piece 34 participates in forming an angular junction module 74, which can be arranged after other similar modules one after the other along a longitudinal axis A , corresponding to the axis common to the two side walls of the tank.
- the first portion 56, the second portion 58 and the intermediate portion 60 of each angular junction piece 34 is aligned with the first portion, the second portion and the intermediate portion of the other angular junction pieces 34 of a junction module angular 74.
- Each angular junction module 74 includes a first longitudinal end 75 and a second longitudinal end 77.
- the sealing membrane 38 of the secondary space 37 is exposed at at least one of the longitudinal ends of the plurality of junction modules. angular 74.
- each angular junction module 74 cooperates with the first tank wall 30 and the second tank wall 32.
- the first portion 56 of the angular junction pieces 34 of each angular junction module 74 is intended to be in contact with the first tank wall 30 at the level of the first free edge 62 and of the second free edge 64.
- the secondary space 37 of the first portion 56 of each part forming an angular junction module 74 is arranged in the continuity of the secondary space 37 of the first tank wall 30, the primary space 41 of the first portion 56 of each part forming each angular junction module 74 also being arranged in continuity of the primary space 41 of the first wall of the tank 30.
- the secondary space 37 of the first portion 56 of the parts forming each angular junction module 74 is covered with the primary space 41 of the first tank wall 30 up to the first free edge 62.
- the secondary space 37 of the second portion 58 of each part forming an angular junction module 74 is arranged in the continuity of the the secondary space 37 of the second tank wall 32
- the primary space 41 of the second portion 58 of each part forming an angular junction module 74 is arranged in the continuity of the primary space 41 of the second tank wall 32.
- the secondary space 37 of the second portion 58 of the parts forming each angular junction module 74 in its part not covered by the primary space, is covered by the primary space 41 of the second tank wall 30 up to at the third free edge 6 8.
- the side walls 30, 32 of the sealed and thermally insulating tank 26 rest directly on the bearing walls 18, 20 of the internal supporting structure 6.
- the outer face 29 at the level of the intermediate portion 60 which extends in a plane inclined with respect to the main extension planes of the first and second side walls of the vessel, forms a chamfer and thus a clearance zone 76 between the portion. intermediate 60 and the internal supporting structure 6 at the junction zone 24.
- the internal supporting structure 6 present in this junction zone 24, that is to say in the corner formed between the first bearing side wall 18 and the second bearing side wall 20 , a reinforcing element 78 which is arranged to be in contact with each of the bearing side walls and with the external face 29 of the intermediate portion 60.
- the internal supporting structure 6 is equipped with a bearing element. reinforcement 78 capable of filling the clearance zone 76.
- the reinforcement element 78 here takes on a triangular cross-section shape similar to that of the clearance zone, by presenting a contact face 80 capable of forming a stop for the movement of the portion. intermediate under the effect of the pressure exerted by the liquid natural gas present in the tank, and an opposite apex 82, having an angle substantially equal to 90 ° to come to match the wedge shape of the junction zone 24.
- the element nt of reinforcement 78 extends mainly along the longitudinal axis A, so as to form a reinforcement for each of the angular junction pieces 34.
- the reinforcement element 78 may in particular consist of a plate forming a longitudinal rib arranged at 135 ° each of the span walls of the internal load-bearing structure.
- the contact face 80 is opposite the intermediate portion 60 of the angular junction piece 34.
- the reinforcing element 78 and the angular junction piece 34 participate in delimiting a space extending between the contact face 80 of the reinforcing element and the outer face 29 of the intermediate portion 60 of the junction piece angular 34.
- This space is here regular along two faces, that is to say a dimension measured between the contact face 80 and the outer face 29 of the intermediate portion 60 along an axis perpendicular to the main extension plane of the contact face 80 of the reinforcing element 78 and / or of the outer face 29 of the intermediate portion 60 is constant.
- the contact face 80 of the reinforcing element 78 and the outer face 29 of the intermediate portion 60 each extend in a plane parallel to the plane in which the other face is inscribed.
- the pressure exerted on the internal face 27 of the intermediate portion 60 by the liquid gas then implies a plane contact directly between the external face 29 of the intermediate portion 60 and the contact face 80 of the reinforcing element 78.
- the external face 29 of the intermediate portion 60 of the plurality of angular junction pieces 34 rests on the reinforcing element 78.
- the pressure exerted by the liquid natural gas stored in the sealed and thermally insulating tank 26 on the internal face 27 of the intermediate portion 60 is then distributed more easily over the outer face 29 of each portion of the corresponding angular junction piece 34, the reinforcing element 78 forming at the level of the contact face a face substantially perpendicular to the general direction the pressure of the liquid natural gas in this junction zone 24 of the tank.
- the pressure exerted by the liquid natural gas stored in the sealed and thermally insulating tank 26 is thus better distributed and reduces the risk of the primary sealing membrane 42 appearing to leak.
- this distribution of the pressure on various elements of the sealed and thermally insulating tank 26 and of the internal supporting structure 6 influences the concentration of stiffeners 8, 10 previously mentioned and more particularly the concentration of a first plurality of stiffeners 8 arranged between the outer shell 4 and the first bearing wall 18 of the internal supporting structure 6 and the concentration of a second plurality of stiffeners 10 arranged between the outer shell 4 and the second bearing wall 20 of the internal supporting structure 6.
- stiffeners 8, 10 in the vicinity of the junction zone 24, and only a first stiffener 84, 90 of each plurality of stiffeners 8 , 10 may be in contact with the corresponding bearing wall 18, 20 of the internal bearing structure 6 at the level of the junction zone 24 while several stiffeners 86, 88, 92, 94 may be in contact with one of the walls bearing range 18, 20, at a distance from this junction zone 24.
- the concentration of stiffeners is thus reduced near the angular junction piece.
- a second stiffener 86, 92 is positioned between the first stiffener 84, 90 and a third stiffener 88, 94.
- concentration of stiffeners reduced at the junction zone and the angular junction piece it is understood that the distance separating the second stiffener 86, 92 and the third stiffener 88, 94 is smaller than the distance separating the second stiffener 86, 92 from the first stiffener 84, 90.
- the first stiffener 84, 90 of each plurality of stiffeners is in contact with the bearing side wall of the internal supporting structure 6 at the level of the reinforcing element 78, without this being limitative of the invention.
- this first stiffener 84, 90 can extend at the level of the junction zone at a distance from the reinforcing element and more particularly in a zone covered by the first portion or the second portion of the angular junction piece.
- each side wall 18, 20 of the vessel a proximal zone 101 and a distal zone 103 according to their arrangement with respect to the nearest junction zone 24, these two zones being delimited one with respect to the other by a demarcation in the extension of the free edge of the secondary space of the angular junction piece, namely the second free edge 64 for the first side wall of the tank 18 and the fourth free edge 70 for the second side wall of vessel 20.
- the proximal zone 101 consists of the zone extending between the junction zone 24 and this demarcation and the distal zone 103 consists of the zone moving away from the junction zone from this demarcation. As illustrated here in FIG.
- first stiffener 84, 90 is advantageously located in the proximal zone 101, while several stiffeners 86, 88, 92, 94, are arranged in the distal zone 103.
- the distance between the first stiffener 84, 90 and the second stiffener 86, 92 is greater than the distance separating the second stiffener 86, 92 from the third stiffener 88, 94.
- the first stiffener 84 of the first plurality of stiffeners 8 can in particular be arranged in the transverse alignment of the first free edge 62 of the piece of angular junction 34 and the first stiffener 90 of the second plurality of stiffeners 10 can in particular be arranged in vertical alignment with the third free edge 68 of the angular junction piece 34.
- At least a first stiffener of a plurality of stiffeners 8, 10 is positioned at a distance d from the corner of the internal load-bearing structure 6, i.e. from the top 82 of the. 'reinforcing element 78 and the first stiffener 84, 90. More particularly, in the example illustrated, each first stiffener of the plurality of stiffeners is arranged at this same distance d from the corner of the internal supporting structure 6.
- the dimensions of the angular junction part are determined as a function of this positioning of the first stiffeners and of this distance d. More particularly, one can calculate a dimension D60 of the intermediate portion 60, measured along the outer face 29 of the intermediate portion 60 between the first bonded edge 66 and the second bonded edge 72, so that:
- dimensions D56, D58 of the first portion 56 and of the second portion 58 are equivalent to dimension D60 of the pre-determined intermediate portion. More particularly, a dimension D56 of the first portion 56, here measured vertically along the outer surface between the first bonded edge 66 and the zone of contact with the first stiffener 84 of the first plurality of stiffeners 8, that is to say ie to the right of the first free edge 62, has a value equivalent to the value of the dimension D60 of the intermediate portion.
- a dimension D58 of the second portion 58 measured here transversely along the outer surface between the second bonded edge 72 and the area of contact with the first stiffener 90 of the second plurality of stiffeners 10, that is to say to the right of the third free edge 68, has a value equivalent to the value of the dimensions D60 and D56 previously mentioned.
- the contact face 80 of the reinforcing element 78 has a shape distinct from the flat surface previously mentioned, forming a fillet 91 rather than a square corner. More particularly, the contact face 80 has an advantageously concave curvature, so that the space delimited between the contact face 80 of the reinforcing element 78 and the outer face 29 of the intermediate portion 60 is no longer constant and increases as one approaches the center of the intermediate portion 60.
- This space is filled by one or more shims 93, for example in the form of plywood panels and / or cylinders of wood for example, and / or by leveling material 95, such as mastic for example illustrated in FIG.
- reinforcing element 8 by a hatched zone, it being understood that this list is not exhaustive. It should be noted that the structure of the reinforcing element is easier to produce when it has a fillet and that it presents less risk of breakage at the junction with the bearing walls of the supporting structure under the effect of the pressure exerted by the liquid gas, the additional presence of reinforcing material filling the space making it possible to ensure the good transmission of the forces.
- Each angular junction module 74 which has been described above is provided to ensure the junction between the first tank wall 30 and the second. tank wall 32 of the sealed and thermally insulating tank 26. However, it is not excluded that the tank 26 has other tank walls and that the angular junction modules 74 according to the invention are configured to be positioned in further facing a second junction zone of the vessel walls.
- the plurality of vessel walls further comprises a third vessel wall, or first transverse vessel wall 96, extending in a plane. perpendicular to the first side wall 30 and perpendicular to the second side wall 32. Furthermore, this first transverse tank wall 96 is perpendicular to the main axis of extension of the plurality of angular junction pieces 34, that is- i.e. the longitudinal axis A.
- each wall of the sealed tank 26 can be connected to another wall of the sealed tank 26 by an angular junction module 74.
- the junction between the third tank wall 96 and the first vessel wall 30 may have an angular junction module 74, just like the junction between the third vessel wall 96 and the second vessel wall 32.
- the sealed and thermally insulating tank 26 comprises an angular junction element 98 which differs from the angular junction piece 34 in the presence of a return part.
- the angular junction element 98 comprises a first part 100 and a second part 102.
- Each of the two parts 100 and 102 has a structure substantially equivalent to what has just been described, namely , from an external face 29 towards an internal face 27, a secondary space 37, comprising the secondary thermal insulation barrier 36 and the secondary waterproofing membrane 38, and a primary space 41, comprising the primary thermal insulation barrier 40 and the primary waterproofing membrane 42.
- the secondary thermal insulation barrier 36 comprises, from the external face 29 towards the internal face 27, the insulation wall 44 covered with the first layer of thermal insulation 46, then with the second insulation wall 51 present specifically in the angular junction element in accordance with what has been described above for the angular junction piece.
- This secondary thermal insulation barrier 36 ensures a first maintenance of the temperature inside the sealed and thermally insulating tank 26, advantageously when liquid natural gas is stored there.
- the secondary thermal insulation barrier 36 is covered by the secondary waterproofing membrane 38.
- the secondary sealing membrane 38 ensures the conservation of the liquid natural gas stored in the sealed and thermally insulating tank 26 when a leak of liquid natural gas occurs in the primary space 41.
- the secondary waterproofing membrane 38 includes a flexible secondary waterproofing membrane 48 overlying a plurality of rigid secondary waterproofing membranes 49.
- the triplex strip forming the first flexible waterproofing membrane 48 is intended to be bonded on the one hand to the rigid secondary waterproofing membranes 49, and more particularly to cover the junction areas of these rigid membranes, and on the other hand to the primary thermal insulation barrier 40, thus preventing contamination at the various junctions.
- the primary thermal insulation barrier 40 thus comprises, from the external face 29 towards the internal face 27, the second layer of thermal insulation 52 and the third insulation wall 54.
- the primary thermal insulation barrier 40 is covered by the primary waterproofing membrane 42.
- the angular junction element 98 comprises a first part 100 and a second part 102.
- the first part 100 of the angular junction element 98 is provided to align and cooperate with the plurality of parts or angular junction modules 34, 74, as well as with the first side wall of tank 30 and the second side wall of tank 32.
- the second part 102 of the angular junction element 98 is formed perpendicular to the first part 100 so to extend opposite the first transverse vessel wall 96.
- the first part 100 of the angular junction element 98 comprises, as for the angular junction part 34, a first section 104, a second section 106 and at least one intermediate section 108.
- the first section 104 of the angular junction element 98 extends mainly in a plane parallel to the main extension plane of the first side wall of the tank 30 and of the first portion 56 of the angular junction pieces 34 and as before, primary space 41 and space secondary 37 do not have the same dimensions, both with respect to the longitudinal axis A and with respect to the vertical axis C, it being understood that the main extension plane of the first side wall of tank 30 extends here longitudinally and vertically.
- the first section 104 has a first free end edge 110 and a second free end edge 112, these end edges being perpendicular to each other.
- the secondary space 37 of the first section 104 is not covered with the primary space 41 in the vicinity of the first free end edge 110 and in the vicinity of the second free end edge 112.
- the second section 106 has a shape equivalent to that of the first section 104, with a third free end edge 116 and a fourth free end edge 118. Again, the secondary space 37 is not covered by the. 'primary space 41 in the vicinity of the third and fourth free end edge.
- the first section 104 and the second section 106 of the angular junction member 98 extend mainly in planes perpendicular to each other.
- the first section 104 is not adjacent to the second section 106, due to the presence of the intermediate section of which the first section 104 and the second section 106 are respectively secured at a respective linked side 114, 120.
- the intermediate section 108 extends mainly in an inclined plane, secant on the one hand to the main elongation plane of the first section 104 and on the other hand to the main elongation plane of the second section 106.
- the secant plane is parallel to the longitudinal axis A and is oriented so as to advantageously present an angle of approximately 135 ° with each of the main elongation planes mentioned above.
- the intermediate section 108 is thus secant to the first section 104 advantageously at an angle of about 135 ° while also being secant to the second section 106, advantageously at an angle of about 135 °.
- the secondary space 37 is not covered with the primary space 41 at the level of a fifth free side 115 of the intermediate section 108.
- the primary space 41 and the secondary space 37 do not extend. on the same length along the longitudinal axis A.
- the primary space 41 is shorter than the secondary space 37 along the longitudinal axis A towards the fifth free side 115 of the intermediate section 108.
- the secondary waterproofing membrane 38 is uncovered at the fifth free side 115 without any superimposed and / or glued element.
- the intermediate section 108 has a dimension which increases as it moves away from the internal face 27, in particular in order in particular to best distribute the pressures exerted by the liquid natural gas present in the tank, such as that cal could be described previously.
- the intermediate section 108 is again facing a clearance zone which can be filled with a reinforcing element against which the junction element rests at the level of the outer face of the intermediate section.
- the reinforcing element can have a contact face extending in a plane or forming a fillet, as described above, the intermediate section 108 being able to include shims and / or patching material to fill. the space between the outer face 29 and the contact face of the reinforcing element.
- the second part 102 of the junction element 98 extends mainly in a plane perpendicular to the longitudinal axis A, that is to say in a plane perpendicular to each of the sections of the first part 100 of the element junction.
- the second part 102 of the angular junction element 98 forms a deflection part which extends perpendicularly the first part 100 of the angular junction element 98.
- the second part 102 comprises a return wall 121 having a free transverse side 122, a linked transverse side 124, a free vertical side 126 and a linked vertical side 128.
- the free transverse side 122 and the linked transverse side 124. extend along a transverse axis B, perpendicular to the longitudinal axis A and the vertical axis C, while the free vertical side 126 and the side vertical linked 128 extend along the vertical axis C.
- the second part 102 is integral with the first part 100 at the level of the linked transverse side 124 and the linked vertical side 128.
- the secondary space 37 is not covered with the primary space 41 at the level of the free transverse side 122 and of the free vertical side 126 of the second part 102 of the angular junction element 98. Indeed, the primary space 41 and the secondary space 37 do not extend the same length along the transverse axis B and along the vertical axis C. As before, the primary space 41 is shorter than the secondary space 37, here along the transverse axis B to the free vertical side 126 and also shorter along the vertical axis C to the free transverse side 122.
- the purpose of the angular junction element 98 according to the invention is to optimize the distribution of the pressure exerted by the liquid natural gas on the junction zones of the constituent walls of said tank 26, in particular by the shape of the intermediate section 108 and the clearance zone between this intermediate section and the junction zone of the bearing walls 18, 20, while providing a connection between the first transverse vessel wall 96 and the plurality of angular junction modules 74.
- the pressure exerted by the gas natural liquid stored in the sealed and thermally insulating tank 26 on the internal face 27 at the level of the intermediate section 108 of the angular junction element 98 is distributed over the whole of the angular junction element 98, and up to the return wall 121 which extends opposite the first transverse wall of the tank 96.
- the primary space 41 of the first part 100 and the primary space of the second part 102 of the angular junction element 98 can be one piece.
- the primary sealing membrane 42 at the first part 100 can be welded to the primary sealing membrane 42 of the second part 102, or be made as a single element.
- the first part 100 of the angular junction element 98 is intended to be in contact with an angular junction piece 34 of an angular junction module 74.
- the first portion 56, the second portion 58 and the intermediate portion 60 of the closest angular junction module 74 of the angular junction element 98 align respectively with the first section 104, the second section 106 and the intermediate section 108 of the first part 100 of the angular junction element 98.
- the secondary space 37 of the angular junction element 98 is in contact with the secondary space of this angular junction module 74.
- primary space panels 41 are fixed by gluing and welding on the secondary space 37 between the primary space 41 associated with the angular junction module 74 and the primary space 41 associated with the angular junction element 98.
- the first section 104 of the angular junction element 98 and the first portion 56 of the angular junction pieces 34 are intended to be in contact with the first side wall of the vessel 30.
- the fixing of the angular junction element 98 and the angular junction pieces 34 to the first side wall of the tank 30 is carried out in a similar way to the fixing of the angular junction element 98 with the nearest angular junction module 74.
- a panel of the primary space 41 is glued and welded at the connection between the first side wall of the vessel 30 and the angular junction element 98 and the plurality of angular junction pieces 34.
- the second section 106 of the angular junction element 98 and the second portion 58 of the angular junction pieces 74 are intended to be in contact with the second side wall of the tank 32.
- the fixing of the angular junction element 98 and the angular junction pieces 34 to the second side wall of the tank 32 is carried out in a manner similar to the fixing of the angular junction element 98 with the nearest angular junction module 74.
- a panel of the primary space 41 is glued and welded at the connection between the second vessel side wall 32 and the angular junction element 98 and the plurality of angular junction pieces 34.
- the first lateral vessel wall 30, respectively the second lateral vessel wall 32, and the first transverse vessel wall 98 are integral with one another via a first conventional junction element 130, respectively a second conventional junction element. 132, produced in a known manner.
- the first conventional junction element 130 and the second conventional junction element 132 each have two parts. Each of the parts of the junction elements are perpendicular to each other, and each extends in a main extension plane of one of the vessel walls described above.
- the angular junction element 98 is thus in contact with at least one of the ends of at least one conventional junction element 130. In the example illustrated, the angular junction element 98 is in contact on the one hand.
- a sealed tank according to the invention can be made so that the third wall, or first transverse wall 96, perpendicular to the first side wall 30 and to the second side wall 32, is linked to each of these walls by an angular junction module 74.
- the The angular junction element 98 arranged at the junction of these three walls is particular in that an intermediate portion similar to what has been previously described is arranged between sections of the angular junction element arranged in s the extension of each of the walls.
- the angular junction element thus being adapted to present at each junction of two walls a shape similar to the first part as described above, it should be noted that the reinforcement 78 provided to fill the clearance between the angular junction element and the internal supporting structure 6 this time has a pyramidal shape.
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Abstract
The present invention relates to a sealed and thermally insulating tank (26) intended for storing a fluid and capable of resting on a supporting structure (6) of a vessel, the sealed tank (26) comprising a plurality of tank walls including a first vessel wall (30) and at least one second vessel wall (32), the first vessel wall (30) extending mainly in a first plane and the second vessel wall (32) extending mainly in a second plane, the first plane and the second plane being perpendicular to each other, the first tank wall (30) and the second tank wall (32) being connected by an angular connecting piece (34), characterised in that the angular connecting piece (34) has a first portion (56) extending mainly in the first plane, a second portion (58) extending mainly in the second plane and at least one intermediate portion (60) extending mainly in a plane that intersects the first plane and the second plane.
Description
DESCRIPTION DESCRIPTION
Titre : Cuve de gaz naturel à l’état liquide d’un navireTitle: Natural gas tank in the liquid state of a ship
La présente invention se rapporte au domaine des cuves de gaz naturel à l’état liquide dans le transport maritime. The present invention relates to the field of natural gas tanks in the liquid state in maritime transport.
Le gaz naturel liquide est transporté par voie maritime dans des cuves de stockage étanches et thermiquement isolantes ménagées sur des navires de transport. Le gaz naturel est maintenu sous forme liquide pour augmenter la quantité de gaz naturel transporté par cuve, le volume d’un litre de gaz naturel sous forme liquide étant bien inférieur au volume d’un litre de gaz naturel sous forme gazeuse. Ces cuves maintiennent le gaz naturel liquide à très basse température, et plus précisément à une température inférieure à -163°C, température à laquelle le gaz naturel est sous forme liquide à pression atmosphérique. Liquid natural gas is transported by sea in sealed and thermally insulating storage tanks on transport ships. Natural gas is kept in liquid form to increase the amount of natural gas transported per tank, the volume of one liter of natural gas in liquid form being much less than the volume of one liter of natural gas in gaseous form. These tanks maintain the liquid natural gas at very low temperature, and more precisely at a temperature below -163 ° C, temperature at which the natural gas is in liquid form at atmospheric pressure.
De tels cuves de gaz naturel à l’état liquide peuvent également être utilisées comme réservoir par certains navires. En d’autres termes, les navires chargent et stockent du gaz naturel liquide dans leurs cuves puis utilisent ensuite le gaz naturel liquide comme carburant. Such liquid natural gas tanks can also be used as a reservoir by some ships. In other words, ships load and store liquid natural gas in their tanks and then use the liquid natural gas as fuel.
Les cuves de gaz naturel liquide présentent généralement une forme parallélépipédique dont les parois sont portées par la coque interne du navire dans lequel la ou les cuves sont installées. Plus particulièrement, la coque des navires sur lesquels sont embarquées les cuves comportent une coque externe en contact avec le milieu extérieur du navire, et une coque interne utilisée comme structure porteuse des cuves. Des raidisseurs s’étendent entre la coque externe et la coque interne pour soutenir la coque interne, ainsi que les parois de la ou les cuves. Liquid natural gas tanks generally have a parallelepipedal shape, the walls of which are carried by the internal hull of the ship in which the tank or tanks are installed. More particularly, the hulls of ships on which the tanks are loaded include an outer hull in contact with the external environment of the ship, and an internal hull used as a supporting structure for the tanks. Stiffeners extend between the outer shell and the inner shell to support the inner shell, as well as the walls of the vessel (s).
Une fois chargé dans une cuve, le gaz naturel liquide exerce une pression sur les parois de la cuve. Les raidisseurs précédemment évoqués permettent de s’assurer de la tenue des parois à cette pression. Les zones de jonction des parois de la cuve, ou en d’autres termes les coins de la forme parallélépipédique de cette cuve, peuvent tout particulièrement être fragilisés par cette pression et il convient de s’assurer de l’étanchéité de la cuve dans ces zones de jonction des parois, afin
d’éviter une contamination de la paroi de cuve par du gaz naturel liquide, voire dans certains cas une fuite de la cuve de stockage entraînant une perte du gaz naturel liquide stocké. Once loaded into a tank, liquid natural gas exerts pressure on the walls of the tank. The previously mentioned stiffeners make it possible to ensure that the walls withstand this pressure. The junction zones of the walls of the tank, or in other words the corners of the parallelepipedal shape of this tank, can very particularly be weakened by this pressure and it is necessary to ensure the tightness of the tank in these. junction areas of the walls, in order to to avoid contamination of the vessel wall by liquid natural gas, or even in certain cases a leak from the storage vessel leading to a loss of the stored liquid natural gas.
Dans ce contexte, la présente invention a tout d’abord pour objet une cuve étanche et thermiquement isolante apte à reposer sur une structure porteuse d’un navire, la cuve étanche comportant une pluralité de parois de cuve dont une première paroi de cuve et au moins une deuxième paroi de cuve, la première paroi de cuve s’étendant principalement dans un premier plan et la deuxième paroi de cuve s’étendant principalement dans un deuxième plan, le premier plan et le deuxième plan étant perpendiculaires l’un par rapport à l’autre, la première paroi de cuve et la deuxième paroi de cuve étant liées par une pièce de jonction angulaire, caractérisé en ce que la pièce de jonction angulaire présente une première portion s’étendant principalement dans un plan parallèle au premier plan, un deuxième portion s’étendant principalement dans un plan parallèle au deuxième plan et au moins une portion intermédiaire s’étendant principalement dans un plan sécant au premier plan et au deuxième plan, la première portion de la pièce de jonction angulaire présentant une épaisseur équivalente à celle de la première paroi de cuve et s’étendant dans le prolongement de cette première paroi de cuve et la deuxième portion de la pièce de jonction angulaire présentant une épaisseur équivalente à celle de la deuxième paroi de cuve et s’étendant dans le prolongement de cette deuxième paroi de cuve. In this context, the present invention firstly relates to a sealed and thermally insulating tank capable of resting on a supporting structure of a ship, the sealed tank comprising a plurality of tank walls including a first tank wall and at the bottom. least a second vessel wall, the first vessel wall extending mainly in a first plane and the second vessel wall extending mainly in a second plane, the first plane and the second plane being perpendicular to each other the other, the first tank wall and the second tank wall being linked by an angular junction piece, characterized in that the angular junction piece has a first portion extending mainly in a plane parallel to the first plane, a second portion extending mainly in a plane parallel to the second plane and at least one intermediate portion extending mainly in a plane secant to the first plane and the second plane, the first 1st portion of the angular junction piece having a thickness equivalent to that of the first tank wall and extending in the extension of this first tank wall and the second portion of the angular junction piece having a thickness equivalent to that of the second vessel wall and extending in the extension of this second vessel wall.
On comprend que la cuve est destinée à recevoir du gaz naturel liquide, le gaz naturel devant être au maximum à une température de -160°C pour être conserver sous sa forme liquide à pression atmosphérique. Ainsi, la cuve comporte une succession de couches assurant dans un premier temps le maintien du gaz naturel liquide à une température d’au plus -160°C et dans un second temps une étanchéité maximale pour réduire le risque de fuite du gaz naturel liquide. Cette cuve peut notamment être utilisée pour stocker du gaz naturel liquide pendant la navigation ou être dans l’attente de son déchargement à quai, par exemple, ou bien encore être utilisée pour l’alimentation des machines du navire sur lequel la cuve est embarquée. Une telle température du gaz naturel liquide peut augmenter si celui-ci est maintenu dans la cuve à une pression supérieure à la pression
atmosphérique. A titre d’exemple, la cuve peut être opérée à une pression de 1 bar gauge et dans un tel cas, le gaz naturel sera maintenu à l’état liquide à une température maximale de -152°C. It will be understood that the vessel is intended to receive liquid natural gas, the natural gas having to be at a maximum temperature of -160 ° C. in order to be kept in its liquid form at atmospheric pressure. Thus, the tank comprises a succession of layers ensuring firstly the maintenance of the liquid natural gas at a temperature of at most -160 ° C and secondly maximum sealing to reduce the risk of leakage of the liquid natural gas. This tank can in particular be used for storing liquid natural gas during navigation or while awaiting its unloading at the quay, for example, or even be used to supply the machinery of the ship on which the tank is on board. Such a temperature of liquid natural gas can increase if it is kept in the tank at a pressure greater than the pressure. atmospheric. By way of example, the tank can be operated at a pressure of 1 bar gauge and in such a case, the natural gas will be maintained in the liquid state at a maximum temperature of -152 ° C.
La cuve est supportée par la coque interne du navire, qui forme la structure porteuse, car cette cuve avec une membrane n’est pas une structure autoporteuse. La coque interne est ménagée pour loger la cuve et supporter la pression exercée par le gaz naturel liquide stocké dans la cuve sur les parois de la cuve. The tank is supported by the internal hull of the vessel, which forms the supporting structure, because this tank with a membrane is not a self-supporting structure. The internal shell is provided to house the tank and withstand the pressure exerted by the liquid natural gas stored in the tank on the walls of the tank.
La cuve comprend au moins deux parois, les deux parois étant perpendiculaires l’une par rapport à l’autre. Le gaz naturel liquide stocké exerce une pression sur chacune de ces parois et la structure de la cuve avec la pièce de jonction selon l’invention permet de gérer la pression exercée au niveau de la zone de jonction entre les deux parois, afin de limiter le risque de fuite de gaz naturel liquide au niveau de cette zone jonction. The tank has at least two walls, the two walls being perpendicular to each other. The stored liquid natural gas exerts a pressure on each of these walls and the structure of the tank with the junction part according to the invention makes it possible to manage the pressure exerted at the level of the junction zone between the two walls, in order to limit the risk of liquid natural gas leakage at this junction zone.
La pièce de jonction est particulière en ce qu’elle présente trois parties parmi lesquelles deux parties ici dénommées première portion et deuxième portion, sont respectivement disposées dans un plan parallèle au plan d’extension d’une des parois latérales de cuve, et une troisième partie, ici dénommée portion intermédiaire, est inclinée par rapport à chacune des autres parties. Cette troisième partie forme une partie intermédiaire, agencée entre les deux autres parties, qui est configurée pour répartir les pressions exercées par le gaz naturel liquide en direction de chacune des parois latérales de cuve. Tel que cela a été précisé, la pièce de jonction angulaire et/ou l’élément de jonction angulaire présentent une épaisseur similaire ou sensiblement similaire, aux jeux de fabrication près, à l’épaisseur de la première paroi de cuve et/ou à l’épaisseur de la deuxième paroi de cuve de sorte que la pièce de jonction angulaire assure une continuité structurelle de la cuve au niveau d’un coin de la cuve, en faisant un lien structurel entre deux parois latérales perpendiculaires formant principalement la cuve mais qui ne présentent pas de continuité l’une par rapport à l’autre. The junction piece is particular in that it has three parts among which two parts here called the first portion and second portion, are respectively arranged in a plane parallel to the extension plane of one of the side walls of the tank, and a third part, here called intermediate portion, is inclined relative to each of the other parts. This third part forms an intermediate part, arranged between the other two parts, which is configured to distribute the pressures exerted by the liquid natural gas in the direction of each of the side walls of the vessel. As has been specified, the angular junction piece and / or the angular junction element have a similar or substantially similar thickness, except for manufacturing clearances, to the thickness of the first tank wall and / or to the thickness of the tank. 'thickness of the second tank wall so that the angular junction piece ensures structural continuity of the tank at a corner of the tank, making a structural link between two perpendicular side walls mainly forming the tank but which does not show no continuity with respect to each other.
Selon une autre caractéristique optionnelle de l’invention, la cuve étanche comporte au moins une troisième paroi de cuve s’étendant principalement dans un troisième plan perpendiculaire au premier plan, au deuxième plan et au plan sécant, et
présentant une zone de jonction avec la première paroi de cuve et la deuxième paroi de cuve, dans laquelle la zone de jonction comprend un élément de jonction angulaire, l’élément de jonction angulaire comportant une première partie et une deuxième partie, la première partie présentant une première section s’étendant principalement dans le premier plan, une deuxième section s’étendant principalement dans le deuxième plan et une section intermédiaire s’étendant principalement dans le plan sécant, la deuxième partie présentant une paroi de renvoi perpendiculaire à la première partie et s’étendant principalement dans le troisième plan. According to another optional characteristic of the invention, the sealed tank comprises at least one third tank wall extending mainly in a third plane perpendicular to the first plane, to the second plane and to the secant plane, and having a junction zone with the first tank wall and the second tank wall, in which the junction zone comprises an angular junction element, the angular junction element comprising a first part and a second part, the first part having a first section extending mainly in the first plane, a second section extending mainly in the second plane and an intermediate section extending mainly in the secant plane, the second part having a return wall perpendicular to the first part and extending mainly in the third plane.
La troisième paroi de cuve s’étend dans un plan perpendiculaire au plan d’extension de la première paroi de cuve, au plan d’extension de la deuxième paroi de cuve ainsi qu’au plan d’extension de la première portion, de la deuxième portion et de la portion intermédiaire de la pièce de jonction. The third tank wall extends in a plane perpendicular to the extension plane of the first tank wall, to the extension plane of the second tank wall as well as to the extension plane of the first portion, of the second portion and the intermediate portion of the junction piece.
L’élément de jonction assure ainsi la liaison entre la troisième paroi de cuve et la première paroi de cuve, la deuxième paroi de cuve et la pièce de jonction, grâce à une première partie s’étendant dans les plans d’extension de la première paroi de cuve, de la deuxième paroi de cuve, ainsi que de la pièce de jonction angulaire, et grâce à une deuxième partie s’étendant dans le plan d’extension de la troisième paroi de cuve. The junction element thus ensures the connection between the third tank wall and the first tank wall, the second tank wall and the junction piece, thanks to a first part extending in the extension planes of the first vessel wall, the second vessel wall, as well as the angular junction piece, and thanks to a second part extending in the extension plane of the third vessel wall.
L’élément de jonction angulaire assure également la répartition de la pression exercée par le gaz naturel liquide sur la face interne de la cuve au niveau de la zone de liaison de la première paroi de cuve, de la deuxième paroi de cuve et de la troisième paroi de cuve. The angular junction element also ensures the distribution of the pressure exerted by the liquid natural gas on the internal face of the vessel at the level of the connection zone of the first vessel wall, of the second vessel wall and of the third. tank wall.
Selon une caractéristique optionnelle de l’invention, la pièce de jonction angulaire et/ou l’élément de jonction angulaire présentent chacun une face interne et une face externe, la face interne formant un chanfrein interne au niveau de la portion intermédiaire ou au niveau de la section intermédiaire et la face externe formant un chanfrein externe au niveau de la portion intermédiaire ou au niveau de la section intermédiaire, le chanfrein interne et externe s’inclinant selon un angle compris entre 120° et 150° par rapport au premier plan et au deuxième plan.
On comprend que la troisième partie, c’est-à-dire la portion intermédiaire, de la pièce de jonction entre la première paroi de cuve et la deuxième paroi de cuve est avantageusement inclinée selon un angle de 135°, plus ou moins 15°, par rapport à chacun des plans d’extension de la première partie et de la deuxième partie de la pièce de jonction, dénommées respectivement la première portion et la deuxième portion, de sorte que la répartition de la pression exercée par le gaz naturel liquide soit aussi bien effectuée sur l’une ou l’autre des parois latérales liées par la pièce de jonction. According to an optional characteristic of the invention, the angular junction piece and / or the angular junction element each have an internal face and an external face, the internal face forming an internal chamfer at the level of the intermediate portion or at the level of the intermediate section and the external face forming an external chamfer at the level of the intermediate portion or at the level of the intermediate section, the internal and external chamfer inclining at an angle of between 120 ° and 150 ° with respect to the foreground and to the second plan. It is understood that the third part, that is to say the intermediate portion, of the junction piece between the first tank wall and the second tank wall is advantageously inclined at an angle of 135 °, plus or minus 15 ° , with respect to each of the extension planes of the first part and of the second part of the junction piece, respectively called the first portion and the second portion, so that the distribution of the pressure exerted by the liquid natural gas is as well carried out on one or the other of the side walls linked by the junction piece.
Comme la pièce de jonction angulaire, la troisième partie de la pièce de jonction entre la première paroi de cuve et la deuxième paroi de cuve est inclinée à 135°, plus ou moins 15°, par rapport à chacun des plans d’extension de la première partie et de la deuxième partie de la pièce de jonction. Like the angular junction piece, the third part of the junction piece between the first tank wall and the second tank wall is inclined at 135 °, plus or minus 15 °, with respect to each of the extension planes of the first part and the second part of the connecting piece.
Selon une autre caractéristique optionnelle de l’invention, la dimension de la portion intermédiaire de la pièce de jonction angulaire mesurée entre la première portion et la deuxième portion de ladite pièce, et/ou la dimension de la section intermédiaire de l’élément de jonction angulaire mesurée entre la première section et la deuxième section dudit élément, s’agrandit en allant de la face interne vers la face externe.According to another optional characteristic of the invention, the dimension of the intermediate portion of the angular junction part measured between the first portion and the second portion of said part, and / or the dimension of the intermediate section of the junction element angular measured between the first section and the second section of said element, increases while going from the internal face towards the external face.
Il en résulte que la surface interne, et plus particulièrement le chanfrein interne tel qu’il a pu être évoqué précédemment, est moins large que la surface externe, et plus particulièrement le chanfrein externe, la largeur s’entendant comme la dimension perpendiculaire à la direction longitudinale le long de laquelle s’étend principalement la pièce de jonction. It follows that the internal surface, and more particularly the internal chamfer as it could be mentioned previously, is less wide than the external surface, and more particularly the external chamfer, the width being understood as the dimension perpendicular to the longitudinal direction along which mainly extends the junction piece.
Selon une autre caractéristique optionnelle de l’invention, la pièce de jonction angulaire et/ou l’élément de jonction angulaire comportent successivement dans le sens de l’épaisseur depuis l’extérieur vers l’intérieur de la cuve étanche, une barrière thermiquement isolante secondaire apte à être au contact de la structure porteuse, une membrane d’étanchéité secondaire portée par la barrière thermiquement isolante secondaire, une barrière thermiquement isolante primaire reposant contre la membrane d’étanchéité secondaire et une membrane d’étanchéité primaire portée par la barrière thermiquement isolante primaire et destinée à être en contact avec le fluide contenu dans la cuve étanche.
Les parois de cuves ainsi que les pièces de jonction de la cuve de stockage de gaz naturel liquide sont composées d’au moins un espace secondaire et d’un espace primaire, l’espace secondaire de la paroi de cuve repose sur la coque interne du navire par l’intermédiaire de boudins de mastic. L’espace secondaire est composée, successivement depuis la face externe vers la face interne de la cuve, d’une barrière d’isolation thermique secondaire et d’une membrane d’étanchéité secondaire. L’espace primaire est quant à elle composée, successivement depuis la face externe de la cuve vers la face interne de la cuve, d’une barrière d’isolation thermique primaire et d’une membrane d’étanchéité primaire. According to another optional characteristic of the invention, the angular junction piece and / or the angular junction element successively comprise in the direction of the thickness from the outside to the inside of the sealed tank, a thermally insulating barrier secondary capable of being in contact with the supporting structure, a secondary waterproofing membrane carried by the secondary thermally insulating barrier, a primary thermally insulating barrier resting against the secondary waterproofing membrane and a primary waterproofing membrane carried by the thermally barrier primary insulator and intended to be in contact with the fluid contained in the sealed tank. The vessel walls as well as the junction parts of the liquid natural gas storage vessel are composed of at least one secondary space and one primary space, the secondary space of the vessel wall rests on the internal shell of the tank. ship through mastic rods. The secondary space is composed, successively from the outer face to the inner face of the tank, of a secondary thermal insulation barrier and a secondary waterproofing membrane. The primary space is for its part made up, successively from the outer face of the tank to the inner face of the tank, of a primary thermal insulation barrier and a primary waterproofing membrane.
Selon une autre caractéristique optionnelle de l’invention, l’espace secondaire d’une pièce de jonction, composé d’au moins une barrière d’isolation thermique secondaire et d’une membrane d’étanchéité secondaire, est disposé dans le prolongement de l’espace secondaire de la paroi de cuve qu’elle prolonge, ces deux espaces secondaires étant de même constitution. Également, l’espace primaire d’une pièce de jonction, composé d’au moins une barrière d’isolation thermique primaire et d’une membrane d’étanchéité primaire, est disposé dans le prolongement de l’espace primaire de la paroi de cuve qu’elle prolonge, ces deux espaces primaires étant de même constitution. According to another optional characteristic of the invention, the secondary space of a junction piece, composed of at least one secondary thermal insulation barrier and of a secondary waterproofing membrane, is arranged in the extension of the secondary space of the tank wall which it extends, these two secondary spaces being of the same constitution. Also, the primary space of a junction piece, composed of at least one primary thermal insulation barrier and a primary waterproofing membrane, is arranged in the extension of the primary space of the tank wall. that it extends, these two primary spaces being of the same constitution.
Les barrières d’isolation thermique participent au maintien de la température du gaz naturel liquide stocké dans la cuve de stockage en limitant les échanges thermiques entre l’environnement extérieur de la cuve de stockage et l’intérieur de la cuve de stockage. Les membranes d’étanchéité empêchent toutes fuites de gaz naturel liquide. The thermal insulation barriers help maintain the temperature of the liquid natural gas stored in the storage tank by limiting heat exchange between the environment outside the storage tank and the inside of the storage tank. The waterproof membranes prevent any leakage of liquid natural gas.
Selon une autre caractéristique optionnelle de l’invention, la barrière thermiquement isolante secondaire et la membrane d’étanchéité secondaire de la pièce de jonction angulaire et/ou de l’élément de jonction angulaire présentent, selon une direction donnée, une plus grande dimension que la dimension correspondante, selon la même direction, de la barrière thermiquement isolante primaire et de la membrane d’étanchéité primaire. According to another optional characteristic of the invention, the secondary thermally insulating barrier and the secondary sealing membrane of the angular junction part and / or of the angular junction element have, in a given direction, a greater dimension than the corresponding dimension, in the same direction, of the primary thermally insulating barrier and of the primary waterproofing membrane.
La première portion de la pièce de jonction angulaire s’étend principalement dans le premier plan de la portion intermédiaire le long d’une direction verticale. La
dimension de l’espace secondaire mesurée le long de la direction verticale est plus grande que la dimension de l’espace primaire également mesurée le long de la direction verticale au niveau de la première portion. Cela s’applique similairement à la première section de l’élément de jonction angulaire. The first portion of the angular junction piece extends mainly in the first plane of the intermediate portion along a vertical direction. The dimension of the secondary space measured along the vertical direction is greater than the dimension of the primary space also measured along the vertical direction at the first portion. This applies similarly to the first section of the angular junction element.
La deuxième portion de la pièce de jonction angulaire s’étend principalement dans le deuxième plan de la portion intermédiaire le long d’une direction transversale. La dimension de l’espace secondaire mesurée le long de la direction transversale est plus grande que la dimension de l’espace primaire également mesurée le long de la direction transversale au niveau de la deuxième portion. Cela s’applique similairement à la deuxième section de l’élément de jonction angulaire. The second portion of the angular junction piece extends mainly in the second plane of the intermediate portion along a transverse direction. The dimension of the secondary space measured along the transverse direction is greater than the dimension of the primary space also measured along the transverse direction at the second portion. This applies similarly to the second section of the angular joint member.
La première portion, la deuxième portion et la portion intermédiaire de la pièce de jonction angulaire s’étendent le long d’une direction longitudinale commune aux trois portions. La dimension de l’espace secondaire mesurée le long de la direction longitudinale est plus grande que la dimension de l’espace mesurée également le long de la direction longitudinale au niveau de chacune des portions de la pièce de jonction angulaire. Cela s’applique similairement à chacune des sections de l’élément de jonction angulaire. The first portion, the second portion and the intermediate portion of the angular junction piece extend along a longitudinal direction common to the three portions. The dimension of the secondary space measured along the longitudinal direction is greater than the dimension of the space measured also along the longitudinal direction at each of the portions of the angular junction piece. This applies similarly to each of the sections of the angular joint member.
Au niveau des extrémités des pièces de jonction, l’espace secondaire est découverte laissant la membrane d’étanchéité secondaire libre. Lors du montage de la cuve, un panneau d’espace primaire est alors positionné de manière à chevaucher simultanément la première portion de la pièce de jonction et la première paroi de cuve, le panneau rendant ainsi solidaire l’élément de jonction et cette première paroi de cuve. Le même montage est utilisé entre la deuxième portion de la pièce de jonction et la deuxième paroi de cuve ainsi qu’au niveau de la première section, de la deuxième section et de la paroi de renvoi de l’élément de jonction angulaire. At the ends of the junction pieces, the secondary space is uncovered leaving the secondary waterproofing membrane free. When mounting the tank, a primary space panel is then positioned so as to simultaneously overlap the first portion of the junction piece and the first tank wall, the panel thus making the junction element and this first wall integral. tank. The same assembly is used between the second portion of the junction part and the second tank wall as well as at the level of the first section, the second section and the return wall of the angular junction element.
La paroi de renvoi s’étend dans un plan perpendiculaire au premier plan, au deuxième plan et au plan sécant et parallèlement aux directions verticale et transversale. La dimension de l’espace secondaire mesurée le long de la direction verticale est plus grande que la dimension de l’espace primaire également mesurée le long de la direction verticale au niveau de la paroi de renvoi. De plus, la
dimension de l’espace secondaire mesurée le long de la direction transversale est plus grande que la dimension de l’espace primaire également mesurée le long de la direction transversale au niveau de la paroi de renvoi. The deflection wall extends in a plane perpendicular to the first plane, to the second plane and to the secant plane and parallel to the vertical and transverse directions. The dimension of the secondary space measured along the vertical direction is greater than the dimension of the primary space also measured along the vertical direction at the return wall. In addition, the dimension of the secondary space measured along the transverse direction is greater than the dimension of the primary space also measured along the transverse direction at the return wall.
Selon une autre caractéristique optionnelle de l’invention, une dimension de la première portion et/ou de la deuxième portion de la pièce de jonction angulaire présente une valeur équivalente à celle de la dimension de la portion intermédiaire.According to another optional feature of the invention, a dimension of the first portion and / or of the second portion of the angular junction piece has a value equivalent to that of the dimension of the intermediate portion.
L’invention a également pour objet un navire comportant au moins une cuve étanche tel que précédemment décrite. The subject of the invention is also a vessel comprising at least one sealed tank as described above.
Selon une caractéristique optionnelle de l’invention, le navire comporte une coque externe et une structure porteuse, la structure porteuse étant destinée à loger la cuve étanche, la structure porteuse présentant une première paroi de portée s’étendant principalement le long du premier plan et une deuxième paroi de portée s’étendant principalement le long du deuxième plan, la première paroi de portée et la deuxième paroi de portée étant sensiblement perpendiculaires, caractérisé en ce qu’une zone de dégagement est ménagée entre les parois de portée de la structure porteuse dans la zone de jonction et la portion intermédiaire de la pièce de jonction angulaire, et en ce qu’un élément de renfort est logé dans ladite zone de dégagement. According to an optional characteristic of the invention, the ship comprises an outer hull and a supporting structure, the supporting structure being intended to house the sealed tank, the supporting structure having a first bearing wall extending mainly along the foreground and a second bearing wall extending mainly along the second plane, the first bearing wall and the second bearing wall being substantially perpendicular, characterized in that a clearance zone is provided between the bearing walls of the supporting structure in the junction zone and the intermediate portion of the angular junction piece, and in that a reinforcing element is housed in said clearance zone.
Cet élément de renfort permet d’assurer une face d’appui pour la pièce de jonction angulaire qui est sensiblement perpendiculaire à la direction de la pression exercée par le gaz naturel liquide présent dans la cuve au niveau de la zone de jonction des parois de cuve. This reinforcing element makes it possible to provide a bearing face for the angular junction piece which is substantially perpendicular to the direction of the pressure exerted by the liquid natural gas present in the vessel at the level of the junction zone of the vessel walls. .
Selon une autre caractéristique optionnelle de l’invention, l’élément de renfort est de section de forme triangulaire, l’élément de renfort présentant un sommet dont l’angle est équivalent à l’angle droit formé entre la première paroi de portée et la deuxième paroi de portée, l’élément de renfort présentant une face de contact avec la portion intermédiaire qui est opposée à ce sommet. According to another optional characteristic of the invention, the reinforcing element has a triangular shaped section, the reinforcing element having a vertex whose angle is equivalent to the right angle formed between the first bearing wall and the second bearing wall, the reinforcing element having a contact face with the intermediate portion which is opposite to this apex.
La face de contact de cet élément de renfort peut présenter une forme plane et former une équerre de telle sorte que lors du contact entre l’élément de renfort et la portion intermédiaire de la pièce de jonction angulaire, les contraintes sont
équitablement réparties sur toute la face de contact formant face d’appui. De manière alternative, cette face de contact pourrait présenter un profil à facettes, en étant formée d’une pluralité de surfaces planes inclinées les unes par rapport aux autres de manière à tendre vers un profil incurvé vers l’intérieur de l’élément de renfort. Alternativement, et notamment pour faciliter la réalisation de l’élément de renfort agencé à la jonction des parois de portée de la structure porteuse, cette face de contact peut présenter un profil incurvé avec une forme générale concave de l’élément de renfort. Dans ce contexte d’une face incurvée, des renforts et/ou du matériel de ragréage pourraient être disposés dans l’espace ainsi formé entre la face de contact et la portion intermédiaire de la pièce de jonction angulaire. The contact face of this reinforcing element may have a planar shape and form a square such that during contact between the reinforcing element and the intermediate portion of the angular junction piece, the stresses are evenly distributed over the entire contact face forming the support face. Alternatively, this contact face could have a faceted profile, being formed of a plurality of flat surfaces inclined with respect to each other so as to tend towards a profile curved towards the inside of the reinforcement element. . Alternatively, and in particular to facilitate the production of the reinforcing element arranged at the junction of the bearing walls of the supporting structure, this contact face may have a curved profile with a generally concave shape of the reinforcing element. In this context of a curved face, reinforcements and / or leveling material could be placed in the space thus formed between the contact face and the intermediate portion of the angular junction part.
Selon une autre caractéristique optionnelle de l’invention, la coque externe présente une pluralité de raidisseurs en contact avec la structure porteuse, la concentration de raidisseurs étant réduite à proximité de la pièce de jonction angulaire et/ou à proximité de l’élément de jonction angulaire. En d’autres termes, la distance entre deux raidisseurs voisins d’une pluralité de raidisseurs agencée entre la coque externe et la structure porteuse varie selon que l’on soit proche ou loin de la pièce de jonction angulaire, cette distance étant plus élevée lorsque l’on se rapproche de la pièce de jonction angulaire. According to another optional characteristic of the invention, the outer shell has a plurality of stiffeners in contact with the supporting structure, the concentration of stiffeners being reduced near the angular junction piece and / or near the junction element angular. In other words, the distance between two neighboring stiffeners of a plurality of stiffeners arranged between the outer shell and the supporting structure varies depending on whether one is near or far from the angular junction piece, this distance being greater when we approach the angular junction piece.
Ces raidisseurs permettent de transmettre la pression exercée par le gaz naturel liquide présent dans la cuve sur la coque externe du navire. La présence de la pièce de jonction angulaire et/ou de l’élément de jonction angulaire permet de mieux répartir la pression exercée par le gaz naturel liquide en direction des parois de cuve, réduisant ainsi le besoin de raidisseurs au niveau de ces zones de jonction. Selon une autre caractéristique optionnelle de l’invention, une dimension de la portion intermédiaire de la pièce de jonction angulaire est déterminée en fonction de la position du raidisseur le plus proche d’un coin de la structure porteuse interne dans lequel est positionnée la pièce de jonction angulaire, de telle sorte que
avec D60 la dimension de la portion intermédiaire, et d la distance entre le premier raidisseur et le coin de la structure porteuse interne. These stiffeners make it possible to transmit the pressure exerted by the liquid natural gas present in the tank on the outer hull of the ship. The presence of the angular junction piece and / or the angular junction element makes it possible to better distribute the pressure exerted by the liquid natural gas in the direction of the vessel walls, thus reducing the need for stiffeners at these junction zones. . According to another optional characteristic of the invention, a dimension of the intermediate portion of the angular junction piece is determined as a function of the position of the stiffener closest to a corner of the internal bearing structure in which the piece of support is positioned. angular junction, so that with D60 the dimension of the intermediate portion, and d the distance between the first stiffener and the corner of the internal load-bearing structure.
La dimension évoquée de la portion intermédiaire correspond à la longueur de la face externe de cette portion intermédiaire entre un premier bord lié formant jonction entre la portion intermédiaire et la première portion et un deuxième bord lié formant jonction entre la portion intermédiaire et la deuxième portion. The dimension mentioned of the intermediate portion corresponds to the length of the outer face of this intermediate portion between a first bonded edge forming a junction between the intermediate portion and the first portion and a second bonded edge forming a junction between the intermediate portion and the second portion.
D’autres caractéristiques, détails et avantages de l’invention ressortiront plus clairement à la lecture de la description qui suit d’une part, et de plusieurs exemples de réalisation donnés à titre indicatif et non limitatif en référence aux dessins schématiques annexés d’autre part, sur lesquels : Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows, on the one hand, and of several embodiments given by way of indication and not by way of limitation with reference to the appended schematic drawings on the other hand. share, on which:
[Fig. 1] est une vue de côté d’un navire de transport montrant au moins une cuve de gaz naturel à l’état liquide ; [Fig. 1] is a side view of a transport vessel showing at least one tank of natural gas in a liquid state;
[Fig. 2] est une coupe de la représentation schématique d’une cuve comprenant au moins une pièce de jonction angulaire agencée entre les différentes parois latérales de cuve et d’une coque comportant une coque externe, des raidisseurs et une structure porteuse interne à l’intérieur de laquelle est logée la cuve ; [Fig. 2] is a sectional view of the schematic representation of a tank comprising at least one angular junction piece arranged between the various side walls of the tank and of a shell comprising an outer shell, stiffeners and an internal supporting structure inside. of which the tank is housed;
[Fig. 3] est une vue de l’intérieur d’une pluralité de pièces de jonction ; [Fig. 3] is an interior view of a plurality of connecting pieces;
[Fig. 4] est une coupe transversale d’une cuve, de la structure porteuse interne et de la coque externe au niveau de la liaison de deux parois latérales de cuve ; [Fig. 4] is a cross section of a tank, the internal supporting structure and the outer shell at the connection of two side walls of the tank;
[Fig. 5] est une vue de l’intérieur de la cuve d’un élément de jonction angulaire et d’une première paroi transversale de cuve ; [Fig. 5] is a view of the interior of the vessel of an angular junction element and a first transverse vessel wall;
[Fig. 6] est une vue de l’intérieur de la cuve d’au moins une pièce de jonction angulaire et d’au moins un élément de jonction angulaire ; [Fig. 6] is a view of the interior of the vessel of at least one angular junction piece and at least one angular junction member;
[Fig. 7] est une coupe transversale d’un mode de réalisation particulier de la cuve, de la structure porteuse interne, des raidisseurs et de la coque externe, dans une représentation semblable à celle de la figure 4 ; [Fig. 7] is a cross section of a particular embodiment of the tank, of the internal supporting structure, of the stiffeners and of the external shell, in a representation similar to that of FIG. 4;
[Fig. 8] illustre une variante du mode de réalisation de la figure 7.
Les caractéristiques, variantes et les différentes formes de réalisation de l’invention peuvent être associées les unes avec les autres, selon diverses combinaisons, dans la mesure où elles ne sont pas compatibles ou exclusives les unes par rapport aux autres. On pourra notamment imaginer des variantes de l’invention ne comprenant qu’une sélection de caractéristiques décrites par la suite de manière isolée des autres caractéristiques décrites, si cette sélection de caractéristiques est suffisante pour conférer un avantage technique et/ou pour différencier l’invention par rapport à l’état de la technique antérieur. [Fig. 8] illustrates a variant of the embodiment of FIG. 7. The characteristics, variants and the different embodiments of the invention can be associated with each other, in various combinations, insofar as they are not compatible or exclusive with respect to each other. It is in particular possible to imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage and / or to differentiate the invention. compared to the state of the prior art.
Sur la figure 1 est représenté un navire de transport 200, par exemple un méthanier, qui comporte quatre cuves 26 pour le transport ou le stockage de gaz naturel liquéfié, une de ces cuves étant ici rendue visible pour faciliter la compréhension. Le navire de transport 200 peut être configuré pour uniquement stocker et transporter ce gaz naturel liquéfié, ou bien pour s’en servir de carburant pour le fonctionnement du navire. Tel que cela est plus particulièrement illustré sur la figure 2, un tel navire présente une coque 2 comprenant au moins une coque externe 4 et une structure porteuse interne 6, entre lesquelles s’étendent une pluralité de raidisseurs 8, 10. La coque externe 4 est en contact avec l’environnement extérieur du navire, généralement un environnement maritime et/ou fluvial. La structure porteuse interne 6 s’étend à distance de cette coque externe. La dimension des raidisseurs détermine l’écartement entre la coque externe 4 et la structure porteuse interne 6, chaque raidisseur étant solidaire de la coque externe 4, au niveau d’une première extrémité 12, et en contact de la structure porteuse interne 6, au niveau d’une deuxième extrémité 14. On comprend que des raidisseurs sont avantageusement présents sur l’ensemble de la structure porteuse interne 6. In FIG. 1 is shown a transport vessel 200, for example an LNG carrier, which comprises four tanks 26 for the transport or storage of liquefied natural gas, one of these tanks being made visible here to facilitate understanding. The transport vessel 200 can be configured to only store and transport this liquefied natural gas, or to use it as fuel for the operation of the vessel. As is more particularly illustrated in FIG. 2, such a vessel has a hull 2 comprising at least one outer hull 4 and an internal supporting structure 6, between which extend a plurality of stiffeners 8, 10. The outer hull 4 is in contact with the external environment of the ship, generally a maritime and / or river environment. The internal supporting structure 6 extends away from this external shell. The dimension of the stiffeners determines the distance between the outer shell 4 and the internal supporting structure 6, each stiffener being integral with the outer shell 4, at a first end 12, and in contact with the internal supporting structure 6, at the level of a second end 14. It will be understood that stiffeners are advantageously present on the whole of the internal supporting structure 6.
La structure porteuse interne 6 comporte une pluralité de parois de portée, dont une première paroi latérale de portée 18 et au moins une deuxième paroi latérale de portée 20 qui s’étendent dans des plans perpendiculaires. La première paroi latérale de portée 18 comprend un premier côté longitudinal 21 et la deuxième paroi latérale de portée 20 comprend un deuxième côté longitudinal 23 au niveau
desquels la deuxième paroi latérale de portée 20 est adjacente de la première paroi latérale de portée 18. The internal bearing structure 6 comprises a plurality of bearing walls, including a first bearing side wall 18 and at least one second bearing side wall 20 which extend in perpendicular planes. The first bearing side wall 18 comprises a first longitudinal side 21 and the second bearing side wall 20 comprises a second longitudinal side 23 at the level of which the second bearing side wall 20 is adjacent to the first bearing side wall 18.
En d’autres termes, la première paroi latérale de portée 18 et la deuxième paroi latérale de portée 20 sont ainsi perpendiculaires l’une par rapport à l’autre au niveau d’une zone de jonction 24 entre le premier côté longitudinal 21 de la première paroi latérale de portée 18 et le deuxième côté longitudinal 23 de la deuxième paroi latérale de portée 20. In other words, the first bearing side wall 18 and the second bearing side wall 20 are thus perpendicular to each other at the level of a junction zone 24 between the first longitudinal side 21 of the first bearing side wall 18 and the second longitudinal side 23 of the second bearing side wall 20.
La structure porteuse interne 6 loge au moins une cuve étanche et thermiquement isolante 26, ladite cuve 26 étant destinée à recevoir du gaz naturel liquide. La cuve étanche et thermiquement isolante 26 présente une face interne 27, qui est en contact avec le gaz naturel liquide lorsqu’il est stocké dans la cuve étanche et thermiquement isolante, et une face externe 29, reposant sur la pluralité de parois de portée, et notamment la première ou deuxième paroi latérale de portée 18, 20, de la structure porteuse interne 6. La cuve étanche et thermiquement isolante 26 s’étend avantageusement sous la forme d’un parallélépipède rectangle. La cuve étanche et thermiquement isolante 26 présente ainsi une pluralité de parois de cuve, dont une première paroi latérale de cuve 30 et au moins une deuxième paroi latérale de cuve 32. The internal supporting structure 6 houses at least one sealed and thermally insulating tank 26, said tank 26 being intended to receive liquid natural gas. The sealed and thermally insulating tank 26 has an internal face 27, which is in contact with the liquid natural gas when it is stored in the sealed and thermally insulating tank, and an external face 29, resting on the plurality of bearing walls, and in particular the first or second bearing side wall 18, 20, of the internal supporting structure 6. The sealed and thermally insulating tank 26 advantageously extends in the form of a rectangular parallelepiped. The sealed and thermally insulating vessel 26 thus has a plurality of vessel walls, including a first vessel side wall 30 and at least one second vessel side wall 32.
Chacune des parois latérales de cuve 30, 32 repose contre une paroi latérale de portée 18, 20 correspondante. Plus particulièrement ici, dans l’exemple illustré, la face externe 29 de la première paroi latérale de cuve 30 repose sur la première paroi latérale de portée 18 de la structure porteuse interne 6 et la face externe de la deuxième paroi latérale de cuve 32 repose contre la deuxième paroi latérale de portée 20 de la structure porteuse interne 6. II résulte de ce qui précède que la deuxième paroi latérale de cuve 32 et la première paroi latérale de cuve 30 s’étendent dans des plans perpendiculaires l’une par rapport à l’autre. Each of the vessel side walls 30, 32 rests against a corresponding bearing side wall 18, 20. More particularly here, in the example illustrated, the outer face 29 of the first side wall of tank 30 rests on the first side wall of bearing 18 of the internal supporting structure 6 and the outer face of the second side wall of tank 32 rests on against the second bearing side wall 20 of the internal supporting structure 6. It follows from the foregoing that the second vessel side wall 32 and the first vessel side wall 30 extend in planes perpendicular to each other with respect to the other.
Selon l’invention, la première paroi latérale de cuve 30 et la deuxième paroi latérale de cuve 32 sont reliées l’une à l’autre en étant conjointement solidaires d’au moins
une pièce de jonction angulaire 34 selon l’invention qui s’étend au niveau de la zone de jonction 24 précédemment évoquée. According to the invention, the first side vessel wall 30 and the second side vessel wall 32 are connected to each other by being jointly integral with at least an angular junction piece 34 according to the invention which extends at the level of the junction zone 24 previously mentioned.
Tel que notamment illustré sur les figures 2, 4, 7 et 8, la pièce de jonction angulaire 34 forme un prolongement de chacune des parois latérales de cuve en présentant une épaisseur similaire, ou sensiblement similaire aux jeux de fabrication près, à celle de la première paroi latérale de cuve 30 et/ou de la deuxième paroi latérale de cuve 32. En d’autres termes, la pièce de jonction angulaire permet de générer une continuité structurelle de la cuve en faisant un lien entre deux parois latérales perpendiculaires formant principalement la cuve mais qui ne présentent pas de continuité l’une par rapport à l’autre. As illustrated in particular in FIGS. 2, 4, 7 and 8, the angular junction piece 34 forms an extension of each of the side walls of the tank by having a similar thickness, or substantially similar, except for manufacturing clearances, to that of the first side wall of tank 30 and / or of the second side wall of tank 32. In other words, the angular junction piece makes it possible to generate structural continuity of the tank by making a link between two perpendicular side walls mainly forming the tank but which do not have any continuity with respect to each other.
L’épaisseur de l’une ou l’autre des parois latérales de cuve 30, 32 est ici mesurée, le long d’une direction perpendiculaire au plan dans lequel s’étend principalement la paroi latérale de cuve 30, 32 concernée, entre la face interne 27 et la face externe 29. Ainsi, dans l’exemple illustré, l’épaisseur de la première paroi latérale de cuve 30 est mesurée le long d’une direction parallèle à l’axe transversal B et l’épaisseur de la deuxième paroi latérale de cuve 32 est mesurée le long de l’axe vertical C. The thickness of one or the other of the side walls of the vessel 30, 32 is here measured, along a direction perpendicular to the plane in which mainly extends the side wall of the vessel 30, 32 concerned, between the internal face 27 and the external face 29. Thus, in the example illustrated, the thickness of the first side wall of the tank 30 is measured along a direction parallel to the transverse axis B and the thickness of the second. vessel side wall 32 is measured along the vertical axis C.
Plus particulièrement, une première portion de la pièce de jonction angulaire est disposée dans le prolongement de la première paroi latérale de cuve 30, ladite première portion et ladite première paroi latérale de cuve présentant des valeurs d’épaisseur, mesurées respectivement le long d’axes parallèles entre eux, ici parallèles à l’axe transversal B, similaires ou sensiblement similaires l’une à l’autre. Pareillement, une deuxième portion de la pièce de jonction angulaire est disposée dans le prolongement de la deuxième paroi latérale de cuve 32, ladite deuxième portion et ladite deuxième paroi latérale de cuve présentant des valeurs d’épaisseur, mesurées respectivement le long d’axes parallèles entre eux, ici parallèles à l’axe vertical C, similaires ou sensiblement similaires l’une à l’autre. More particularly, a first portion of the angular junction piece is arranged in the extension of the first side wall of tank 30, said first portion and said first side wall of tank having thickness values, respectively measured along axes mutually parallel, here parallel to the transverse axis B, similar or substantially similar to one another. Similarly, a second portion of the angular junction piece is arranged in the extension of the second side wall of tank 32, said second portion and said second side wall of tank having thickness values, respectively measured along parallel axes. between them, here parallel to the vertical axis C, similar or substantially similar to one another.
Avantageusement, la pièce de jonction angulaire 34 présente une première épaisseur similaire à l’épaisseur de la première paroi latérale de cuve 30 au moins au niveau d’une zone de contact entre la pièce de jonction angulaire 34 et la première paroi latérale de cuve 30, et une deuxième épaisseur similaire à l’épaisseur de la deuxième paroi latérale de cuve 32 au moins au niveau d’une zone
de contact entre la pièce de jonction angulaire 34 et la deuxième paroi latérale de cuve 32. Advantageously, the angular junction piece 34 has a first thickness similar to the thickness of the first side wall of vessel 30 at least at the level of a contact zone between the angular junction piece 34 and the first side wall of vessel 30. , and a second thickness similar to the thickness of the second side wall of the tank 32 at least at an area contact between the angular junction part 34 and the second side wall of the tank 32.
On va maintenant décrire plus en détails la structure de cette pièce de jonction angulaire 34, en référence aux figures 3 et 4 notamment. Conformément à la structure des parois de cuve 30, 32 qu’elle participe à relier, la pièce de jonction angulaire 34 comprend, successivement de la face externe vers la face interne, une barrière d’isolation thermique secondaire 36, une membrane d’étanchéité secondaire 38, une barrière d’isolation thermique primaire 40 et une membrane d’étanchéité primaire 42. La barrière d’isolation thermique secondaire 36 et la membrane d’étanchéité secondaire 38 forment une espace secondaire 37 et la barrière d’isolation thermique primaire 40 et la membrane d’étanchéité primaire 42 forment une espace primaire 41. The structure of this angular junction piece 34 will now be described in more detail, with reference to FIGS. 3 and 4 in particular. In accordance with the structure of the vessel walls 30, 32 that it participates in connecting, the angular junction piece 34 comprises, successively from the outer face to the inner face, a secondary thermal insulation barrier 36, a waterproofing membrane secondary 38, a primary thermal insulation barrier 40 and a primary waterproofing membrane 42. The secondary thermal insulation barrier 36 and the secondary waterproofing membrane 38 form a secondary space 37 and the primary thermal insulation barrier 40. and the primary waterproofing membrane 42 form a primary space 41.
On comprend de ce qui précède, tel que cela va être détaillé ci-après, que d’une part l’espace primaire, formé de la barrière d’isolation thermique primaire 40 et de la membrane d’étanchéité primaire 42, de la pièce de jonction angulaire s’étend à la fois dans le prolongement d’un espace primaire équivalent de la première paroi latérale de cuve 30 et dans le prolongement d’un espace primaire équivalent de la deuxième paroi latérale de cuve 32, et que d’autre part l’espace secondaire, formé de la barrière d’isolation thermique secondaire 36 et de la membrane d’étanchéité secondaire 38, de la pièce de jonction angulaire s’étend à la fois dans le prolongement d’un espace secondaire équivalent de la première paroi latérale de cuve 30 et dans le prolongement d’un espace secondaire équivalent de la deuxième paroi latérale de cuve 32. It will be understood from the above, as will be detailed below, that on the one hand the primary space, formed of the primary thermal insulation barrier 40 and of the primary waterproofing membrane 42, of the part of angular junction extends both in the extension of an equivalent primary space of the first side wall of tank 30 and in the extension of an equivalent primary space of the second side wall of tank 32, and that other apart from the secondary space, formed of the secondary thermal insulation barrier 36 and of the secondary waterproofing membrane 38, the angular junction piece extends both in the extension of an equivalent secondary space of the first side wall of tank 30 and in the extension of an equivalent secondary space of the second side wall of tank 32.
La barrière d’isolation thermique secondaire 36 comprend, successivement de la face externe de la cuve vers la membrane d’étanchéité secondaire 38, une première paroi d’isolation 44 et une première couche d’isolant thermique 46. La première paroi d’isolation 44 comprend une planche ayant sensiblement la forme d’un parallélépipède rectangle. La planche est avantageusement en contre-plaqué, par exemple un contre-plaqué de bois. Les dimensions de la planche sont adaptées à la taille des blocs de la barrière d’isolation thermique secondaire 36.
La première couche d’isolant thermique 46 peut être constituée par un matériau plastique alvéolaire, tel qu’une mousse de polyuréthane par exemple, permettant une isolation thermique efficace et bien répartie entre les parois d’isolation. The secondary thermal insulation barrier 36 comprises, successively from the external face of the tank towards the secondary waterproofing membrane 38, a first insulation wall 44 and a first layer of thermal insulation 46. The first insulation wall 44 comprises a board having substantially the shape of a rectangular parallelepiped. The board is advantageously made of plywood, for example wood plywood. The dimensions of the board are adapted to the size of the blocks of the secondary thermal insulation barrier 36. The first layer of thermal insulation 46 may be formed by a cellular plastic material, such as a polyurethane foam for example, allowing effective thermal insulation and well distributed between the insulation walls.
Par ailleurs, la pièce de jonction angulaire 34 comprend une deuxième paroi d’isolation 51 disposée en recouvrement de la première couche d’isolant thermique 46, entre cette première couche et la membrane d’étanchéité secondaire 38. Cette deuxième paroi d’isolation 51, également formée d’une planche avantageusement en contre-plaqué, par exemple un contre-plaqué de bois, est spécifiquement agencée dans la pièce de jonction angulaire, sans qu’elle soit nécessairement prévue dans la composition des parois de cuve. Cette deuxième paroi d’isolation 51 est notamment prévue pour une meilleure tenue à la pression générée sur les jonctions de parois par le gaz naturel présent dans la cuve. Furthermore, the angular junction piece 34 comprises a second insulating wall 51 arranged to cover the first layer of thermal insulation 46, between this first layer and the secondary waterproofing membrane 38. This second insulating wall 51 , also formed of a plank advantageously in plywood, for example a wood plywood, is specifically arranged in the angular junction piece, without it necessarily being provided in the composition of the tank walls. This second insulation wall 51 is in particular provided for better resistance to the pressure generated on the wall junctions by the natural gas present in the tank.
La barrière d’isolation thermique secondaire 36, et plus particulièrement la deuxième paroi d’isolation 51, est solidaire de la membrane d’étanchéité secondaire 38, par exemple par collage. The secondary thermal insulation barrier 36, and more particularly the second insulation wall 51, is integral with the secondary waterproofing membrane 38, for example by gluing.
La membrane d’étanchéité secondaire 38 comprend une membrane d’étanchéité secondaire souple 48 et une membrane d’étanchéité secondaire rigide 49. The secondary waterproofing membrane 38 includes a flexible secondary waterproofing membrane 48 and a rigid secondary waterproofing membrane 49.
Plus particulièrement, une membrane d’étanchéité secondaire rigide 49 est spécifique à chaque portions 56, 58, 60 de la pièce de jonction angulaire 34 et une membrane d’étanchéité secondaire souple 48 est commune à l’ensemble des portions, en venant en recouvrement au moins partiel de chacune des membranes d’étanchéité secondaires rigides 49 qui recouvre la barrière thermiquement isolante secondaire 36 au niveau des surfaces planes. On comprend que la barrière thermiquement isolante secondaire de chaque portion de la pièce de jonction angulaire 34 est recouvert par la membrane d’étanchéité secondaire rigide 49, mais que les intersections entre chacune des portions restent découvertes. La membrane d’étanchéité secondaire souple 48 se positionne en recouvrement des intersections entre chacune des portions 56, 58, 60 de la pièce de jonction angulaire 34 et entre chaque membrane d’étanchéité secondaire rigide 49 recouvrant lesdites portions 56, 58, 60, diminuant le risque de contamination au niveau de ces zones à risque. La membrane d’étanchéité secondaire souple 48 est
une bande triplex, composée d’une feuille d’aluminium collée entre deux mats de verre tressés, ces composants de la bande triplex n’étant pas représentés sur l’ensemble des figures. La membrane d’étanchéité secondaire souple 48 est d’une part en contact et collée sur la membrane d’étanchéité secondaire rigide 49 et d’autre part à la barrière d’isolation thermique primaire 40. More particularly, a rigid secondary waterproofing membrane 49 is specific to each portions 56, 58, 60 of the angular junction piece 34 and a flexible secondary waterproofing membrane 48 is common to all of the portions, by overlapping at least partial of each of the rigid secondary waterproofing membranes 49 which covers the secondary thermally insulating barrier 36 at the level of the flat surfaces. It will be understood that the secondary thermally insulating barrier of each portion of the angular junction piece 34 is covered by the rigid secondary waterproofing membrane 49, but that the intersections between each of the portions remain uncovered. The flexible secondary waterproofing membrane 48 is positioned overlapping the intersections between each of the portions 56, 58, 60 of the angular junction piece 34 and between each rigid secondary waterproofing membrane 49 covering said portions 56, 58, 60, decreasing the risk of contamination in these risk areas. The flexible secondary waterproofing membrane 48 is a triplex strip, composed of an aluminum sheet bonded between two braided glass mats, these components of the triplex strip not being shown in all of the figures. The flexible secondary waterproofing membrane 48 is on the one hand in contact and bonded to the rigid secondary waterproofing membrane 49 and, on the other hand, to the primary thermal insulation barrier 40.
La membrane d’étanchéité secondaire rigide 49 se compose d’une feuille d’aluminium collée entre deux mats de verre tressés imprégnés d’une résine polymère. The rigid secondary waterproofing membrane 49 consists of an aluminum foil bonded between two braided glass mats impregnated with a polymer resin.
La barrière d’isolation thermique primaire 40 comporte une deuxième couche d’isolant thermique 52 et une troisième paroi d’isolation 54 et on pourra se référer à ce qui précède pour la composition et la fonction de chacune de ces couches. The primary thermal insulation barrier 40 comprises a second thermal insulating layer 52 and a third insulation wall 54 and reference may be made to the above for the composition and function of each of these layers.
Lors du montage de la cuve étanche et thermiquement isolante 26, la pièce de jonction angulaire 34 et la pluralité de parois de cuve sont montées par l’intermédiaire des panneaux d’assemblage, disposés les uns à côté des autres et comprenant chacun les différents éléments constituants de la pièce de jonction angulaire 34 et de la pluralité de parois de cuve. Ces panneaux d’assemblage peuvent être recouverts de la membrane d’étanchéité primaire 42, qui peut être en acier inoxydable en présentant des ondes. On notera qu’alternativement la membrane d’étanchéité primaire 42 est par exemple en tôle d’invar®. During the assembly of the sealed and thermally insulating tank 26, the angular junction piece 34 and the plurality of tank walls are mounted by means of the assembly panels, arranged one beside the other and each comprising the different elements. constituents of the angular junction part 34 and of the plurality of vessel walls. These assembly panels can be covered with the primary waterproofing membrane 42, which can be stainless steel with waves. It should be noted that, alternatively, the primary waterproofing membrane 42 is, for example, made of invar® sheet.
Les parois latérales de cuve 30, 32 s’étendent chacune selon un plan d’allongement principal, ces plans d’allongement étant perpendiculaires l’un à l’autre et la pièce de jonction angulaire 34 s’étend elle dans trois plans différents, la pièce de jonction angulaire 34 présentant au moins trois portions différentes s’étendant respectivement dans l’un de ces trois plans différents. The side walls of the tank 30, 32 each extend along a main elongation plane, these elongation planes being perpendicular to each other and the angular junction piece 34 extends in three different planes, the angular junction piece 34 having at least three different portions extending respectively in one of these three different planes.
Selon le premier mode de réalisation, la pièce de jonction angulaire 34 comprend une première portion 56, une deuxième portion 58 et au moins une portion intermédiaire 60. Le nombre de portions intermédiaires n’est pas limitatif, et il convient d’imaginer selon l’invention une pièce de jonction angulaire 34 présentant par exemple quatre portions avec deux portions intermédiaires reliant l’une à l’autre la première portion 56 et la deuxième portion 58.
Tel qu’illustré, la première portion 56 prolonge la portion intermédiaire 60 selon une direction verticale, sensiblement parallèle à un axe vertical C, et la deuxième portion 58 prolonge la portion intermédiaire selon une direction transversale perpendiculaire, sensiblement parallèle à un axe transversal B. According to the first embodiment, the angular junction piece 34 comprises a first portion 56, a second portion 58 and at least one intermediate portion 60. The number of intermediate portions is not limiting, and it should be imagined according to l invention an angular junction piece 34 having for example four portions with two intermediate portions connecting to one another the first portion 56 and the second portion 58. As illustrated, the first portion 56 extends the intermediate portion 60 in a vertical direction, substantially parallel to a vertical axis C, and the second portion 58 extends the intermediate portion in a perpendicular transverse direction, substantially parallel to a transverse axis B.
La première portion 56 et la deuxième portion 58 présentent chacune des espaces primaire 41 et secondaire 37 qui ne s’étendant par sur la même dimension, selon une direction donnée, depuis la portion intermédiaire. Tel qu’illustré sur la figure 3, la dimension de l’espace primaire 41 de la première portion 56 mesurée le long de la direction verticale est plus courte que la dimension de l’espace secondaire 37 de cette première portion 56 également mesurée le long de la direction verticale de sorte que l’espace primaire 41 ne recouvre pas entièrement l’espace secondaire 37. De façon analogue, la dimension de l’espace primaire 41 de la deuxième portion 58 mesurée le long de la direction transversale est plus courte que la dimension de l’espace secondaire 37 de cette deuxième portion 58 également mesurée le long de la direction transversale de sorte que là encore, l’espace primaire 41 ne recouvre pas entièrement l’espace secondaire 37 The first portion 56 and the second portion 58 each have primary 41 and secondary 37 spaces which do not extend over the same dimension, in a given direction, from the intermediate portion. As illustrated in Figure 3, the dimension of the primary space 41 of the first portion 56 measured along the vertical direction is shorter than the dimension of the secondary space 37 of this first portion 56 also measured along of the vertical direction so that the primary space 41 does not entirely cover the secondary space 37. Similarly, the dimension of the primary space 41 of the second portion 58 measured along the transverse direction is shorter than the dimension of the secondary space 37 of this second portion 58 also measured along the transverse direction so that again, the primary space 41 does not entirely cover the secondary space 37
La première portion 56 de la pièce de jonction angulaire 34 s’étend principalement dans le plan d’allongement principal de la première paroi latérale de cuve 30, de manière à prolonger cette première paroi latérale de cuve. La première portion 56 présente un premier bord libre 62 et un deuxième bord libre 64, ces deux bords libres s’étendant à l’opposé de la portion intermédiaire 60 et étant différenciés par la différence de longueur des espaces primaire et secondaire. Plus particulièrement, l’espace primaire 41 de la première portion 56 participe à former le premier bord libre 62 et l’espace secondaire 37 de la première portion 56 participe à former le deuxième bord libre 64. De la sorte, la membrane d’étanchéité secondaire 38 est découverte sur la première portion 56 de la pièce de jonction angulaire 34, depuis le premier bord libre 62 jusqu’au deuxième bord libre 64, et vise à être recouverte par la barrière d’isolation thermique primaire 40 de la première paroi latérale de cuve 30. The first portion 56 of the angular junction piece 34 extends mainly in the main extension plane of the first side wall of the tank 30, so as to extend this first side wall of the tank. The first portion 56 has a first free edge 62 and a second free edge 64, these two free edges extending opposite to the intermediate portion 60 and being differentiated by the difference in length of the primary and secondary spaces. More particularly, the primary space 41 of the first portion 56 participates in forming the first free edge 62 and the secondary space 37 of the first portion 56 participates in forming the second free edge 64. In this way, the sealing membrane secondary 38 is discovered on the first portion 56 of the angular junction piece 34, from the first free edge 62 to the second free edge 64, and aims to be covered by the primary thermal insulation barrier 40 of the first side wall tank 30.
Tel que cela a été évoqué précédemment, et tel qu’illustré plus particulièrement sur la figure 4, la première portion 56 prolonge structurellement et avec une épaisseur
similaire la première paroi latérale de cuve 30 au moins le long de l’axe vertical C vers la portion intermédiaire 58. Plus particulièrement, l’espace secondaire 37 constitutif de la première portion 56 prolonge, ici verticalement, l’espace secondaire 37 constitutif de la première paroi latérale de cuve 30, et l’espace primaire 41 constitutif de la première portion 56 prolonge dans la même direction verticale l’espace primaire 41 constitutif de la première paroi latérale de cuve 30. De plus, la membrane d’étanchéité primaire 42 et la membrane d’étanchéité secondaire 38 sont continues entre la première portion 56 de la pièce de jonction angulaire 34 et la première paroi latérale de cuve 30. La deuxième portion 58 de la pièce de jonction angulaire 34 s’étend principalement dans le plan d’allongement principal de la deuxième paroi latérale de cuve 32, de manière à prolonger cette deuxième paroi latérale de cuve. Ce qui vient d’être décrit pour la première portion 56 se retrouve dans la structure de la deuxième portion 58, avec un troisième bord libre 68 et un quatrième bord libre 70 respectivement formés par l’espace primaire 41 et l’espace secondaire 37 de cette deuxième portion 58.As mentioned above, and as illustrated more particularly in FIG. 4, the first portion 56 extends structurally and with a thickness similarly the first side wall of the tank 30 at least along the vertical axis C towards the intermediate portion 58. More particularly, the secondary space 37 constituting the first portion 56 extends, here vertically, the secondary space 37 constituting the the first side wall of the tank 30, and the primary space 41 constituting the first portion 56 extends in the same vertical direction the primary space 41 constituting the first side wall of the tank 30. In addition, the primary waterproofing membrane 42 and the secondary waterproofing membrane 38 are continuous between the first portion 56 of the angular junction piece 34 and the first side wall of the vessel 30. The second portion 58 of the angular junction piece 34 extends mainly in the plane. main extension of the second side wall of the tank 32, so as to extend this second side wall of the tank. What has just been described for the first portion 56 is found in the structure of the second portion 58, with a third free edge 68 and a fourth free edge 70 respectively formed by the primary space 41 and the secondary space 37 of this second portion 58.
Par ailleurs, la deuxième portion 58 de la pièce de jonction angulaire 34 prolonge structurellement et avec une épaisseur similaire la deuxième paroi latérale de cuve 32 le long de l’axe transversal B vers la portion intermédiaire 58. Plus particulièrement, l’espace secondaire 37 constitutif de la deuxième portion 58 prolonge, ici transversalement, l’espace secondaire 37 constitutif de la deuxième paroi latérale de cuve 32 et l’espace primaire 41 constitutif de la deuxième portion 58 prolonge dans la même direction transversale l’espace primaire 41 constitutif de la deuxième paroi latérale de cuve 32. De plus, la membrane d’étanchéité primaire 42 et la membrane d’étanchéité secondaire 38 sont continues entre la deuxième portion 58 de la pièce de jonction angulaire 34 et la deuxième paroi latérale de cuve 32. Furthermore, the second portion 58 of the angular junction piece 34 extends structurally and with a similar thickness the second side wall of the tank 32 along the transverse axis B towards the intermediate portion 58. More particularly, the secondary space 37 constituting the second portion 58 extends, here transversely, the secondary space 37 constituting the second side wall of the tank 32 and the primary space 41 constituting the second portion 58 extends in the same transverse direction the primary space 41 constituting the the second side wall of the tank 32. In addition, the primary sealing membrane 42 and the secondary sealing membrane 38 are continuous between the second portion 58 of the angular junction piece 34 and the second side wall of the tank 32.
La première portion 56 et la deuxième portion 58 de la pièce de jonction angulaire 34 s’étendent dans des plans perpendiculaires l’un par rapport à l’autre. La première portion 56 n’est pas adjacente à la deuxième portion 58, du fait de la présence de la portion intermédiaire 60 dont sont respectivement solidaires la première portion 56 et la deuxième portion 58 de la pièce de jonction angulaire 34.
La première portion 56 est solidaire de la portion intermédiaire 60 au niveau d’un premier bord lié 66, et la deuxième portion 58 est solidaire de la portion intermédiaire 60 au niveau d’un deuxième bord lié 72. The first portion 56 and the second portion 58 of the angular junction piece 34 extend in planes perpendicular to each other. The first portion 56 is not adjacent to the second portion 58, due to the presence of the intermediate portion 60 of which the first portion 56 and the second portion 58 of the angular junction piece 34 are respectively integral. The first portion 56 is integral with the intermediate portion 60 at a first bonded edge 66, and the second portion 58 is integral with the intermediate portion 60 at the level of a second bonded edge 72.
La portion intermédiaire 60 s’étend principalement dans un plan incliné qui est d’une part sécant au plan principal d’allongement de la première portion 56 et d’autre part sécant au plan principal d’allongement de la deuxième portion 58. Les bords liés 66, 72 précédemment évoqués forment les jonctions entre chacune des portions et chacun des plans principaux correspondants. The intermediate portion 60 extends mainly in an inclined plane which is on the one hand secant to the main plane of elongation of the first portion 56 and on the other hand secant to the main plane of elongation of the second portion 58. The edges linked 66, 72 previously mentioned form the junctions between each of the portions and each of the corresponding main planes.
Ainsi, selon l’invention, la portion intermédiaire 60 forme une paroi inclinée par rapport aux deux portions agencées respectivement dans le prolongement d’une des parois latérales de cuve perpendiculaires entre elles. Thus, according to the invention, the intermediate portion 60 forms an inclined wall relative to the two portions arranged respectively in the extension of one of the side walls of the vessel perpendicular to each other.
Plus particulièrement, dans l’exemple illustré où une unique portion intermédiaire 60 est agencée entre les deux portions 56, 58, le plan incliné dans lequel la portion intermédiaire s’étend principalement présente un angle d’environ 135° avec d’une part la première portion 56 et la première paroi latérale 30 qu’elle prolonge et d’autre part la deuxième portion 58 et la deuxième paroi latérale 32 qu’elle prolonge. More particularly, in the example illustrated where a single intermediate portion 60 is arranged between the two portions 56, 58, the inclined plane in which the intermediate portion mainly extends has an angle of approximately 135 ° with, on the one hand, the first portion 56 and the first side wall 30 which it extends and on the other hand the second portion 58 and the second side wall 32 which it extends.
Il résulte de cet agencement des différentes portions de la pièce de jonction angulaire 34 que la dimension mesurée entre la première portion 56 et la deuxième portion 58 de la portion intermédiaire 60 va en s’agrandissant depuis la face interne 27 vers la face externe 29 de la cuve étanche et thermiquement isolante 26. En d’autres termes, la dimension de la portion intermédiaire 60 entre le premier bord lié 66 de la première portion 56 et le deuxième bord lié 72 de la deuxième portion 58 au niveau de la face interne 27 est plus petite que la dimension de la portion intermédiaire entre le premier bord lié 66 de la première portion 56 et le deuxième bord lié 72 de la deuxième portion 58 au niveau de la face externe 29. It follows from this arrangement of the different portions of the angular junction piece 34 that the dimension measured between the first portion 56 and the second portion 58 of the intermediate portion 60 increases from the internal face 27 towards the external face 29 of the sealed and thermally insulating tank 26. In other words, the dimension of the intermediate portion 60 between the first bonded edge 66 of the first portion 56 and the second bonded edge 72 of the second portion 58 at the level of the internal face 27 is smaller than the dimension of the intermediate portion between the first bonded edge 66 of the first portion 56 and the second bonded edge 72 of the second portion 58 at the outer face 29.
La pièce de jonction angulaire 34 selon l’invention a pour but d’optimiser la répartition de la pression exercée par le gaz naturel liquide, la pression étant représentée par une flèche D sur la figure 4, sur les zones de jonction 24 des parois constitutives de la pluralité de parois de cuve de la cuve étanche et thermiquement
isolante 26. La pression exercée par le gaz naturel liquide présent dans la cuve 26 sur la face interne 27 au niveau de la première portion 56 ou de la deuxième portion 58 est exercée sur le premier espace 41 correspondant de la pièce de jonction angulaire 34, et elle est répartie en direction de la face externe 29 sur l’ensemble du deuxième espace 37 correspondant, c’est-à-dire sur une plus grande étendue. Et la pression exercée par le gaz naturel liquide sur la face interne 27 de la portion intermédiaire 60 est répartie sur l’ensemble de la face externe 29 de cette portion intermédiaire 60, là encore de plus grande dimension. Les efforts de pression du gaz naturel liquide sont répartis sur une plus grande surface d’appui au niveau de la face externe 29 destinée à être en contact avec la structure porteuse interne 6.The purpose of the angular junction piece 34 according to the invention is to optimize the distribution of the pressure exerted by the liquid natural gas, the pressure being represented by an arrow D in FIG. 4, on the junction zones 24 of the constituent walls. of the plurality of tank walls of the sealed and thermally sealed tank insulating 26. The pressure exerted by the liquid natural gas present in the tank 26 on the internal face 27 at the level of the first portion 56 or of the second portion 58 is exerted on the corresponding first space 41 of the angular junction piece 34, and it is distributed in the direction of the outer face 29 over the whole of the corresponding second space 37, that is to say over a larger area. And the pressure exerted by the liquid natural gas on the internal face 27 of the intermediate portion 60 is distributed over the entire external face 29 of this intermediate portion 60, again of a larger dimension. The pressure forces of the liquid natural gas are distributed over a larger bearing surface at the level of the external face 29 intended to be in contact with the internal supporting structure 6.
Tel qu’illustré sur la figure 3, la pièce de jonction angulaire 34 participe à former un module de jonction angulaire 74, qui peut être agencé à la suite d’autres modules similaires les uns après les autres le long d’un axe longitudinal A, correspondant à l’axe commun aux deux parois latérales de cuve. Ainsi, la première portion 56, la deuxième portion 58 et la portion intermédiaire 60 de chaque pièce de jonction angulaire 34 est alignée avec la première portion, la deuxième portion et la portion intermédiaire des autres pièces de jonction angulaire 34 d’un module de jonction angulaire 74. As illustrated in FIG. 3, the angular junction piece 34 participates in forming an angular junction module 74, which can be arranged after other similar modules one after the other along a longitudinal axis A , corresponding to the axis common to the two side walls of the tank. Thus, the first portion 56, the second portion 58 and the intermediate portion 60 of each angular junction piece 34 is aligned with the first portion, the second portion and the intermediate portion of the other angular junction pieces 34 of a junction module angular 74.
Chaque module de jonction angulaire 74 comprend une première extrémité longitudinale 75 et une deuxième extrémité longitudinale 77. La membrane d’étanchéité 38 de l’espace secondaire 37 est découverte au niveau d’au moins une des extrémités longitudinales de la pluralité de modules de jonction angulaire 74.Each angular junction module 74 includes a first longitudinal end 75 and a second longitudinal end 77. The sealing membrane 38 of the secondary space 37 is exposed at at least one of the longitudinal ends of the plurality of junction modules. angular 74.
Tel qu’illustré sur la figure 4, chaque module de jonction angulaire 74 coopère avec la première paroi de cuve 30 et la deuxième paroi de cuve 32. La première portion 56 des pièces de jonction angulaire 34 de chaque module de jonction angulaire 74 est destinée à être en contact avec la première paroi de cuve 30 au niveau du premier bord libre 62 et du deuxième bord libre 64. Ainsi, l’espace secondaire 37 de la première portion 56 de chaque pièce formant un module de jonction angulaire 74 est agencé dans la continuité de l’espace secondaire 37 de la première paroi de cuve 30, l’espace primaire 41 de la première portion 56 de chaque pièce formant chaque module de jonction angulaire 74 étant également agencé dans la continuité
de l’espace primaire 41 de la première paroi de cuve 30. L’espace secondaire 37 de la première portion 56 des pièces formant chaque module de jonction angulaire 74, dans sa partie non recouverte par l’espace primaire, est recouverte de l’espace primaire 41 de la première paroi de cuve 30 jusqu’au premier bord libre 62. Et de façon analogue, l’espace secondaire 37 de la deuxième portion 58 de chaque pièce formant un module de jonction angulaire 74 est agencé dans la continuité de l’espace secondaire 37 de la deuxième paroi de cuve 32, et l’espace primaire 41 de la deuxième portion 58 de chaque pièce formant un module de jonction angulaire 74 est agencé dans la continuité de l’espace primaire 41 de la deuxième paroi de cuve 32. L’espace secondaire 37 de la deuxième portion 58 des pièces formant chaque module de jonction angulaire 74, dans sa partie non recouverte par l’espace primaire, est recouverte par l’espace primaire 41 de la deuxième paroi de cuve 30 jusqu’au troisième bord libre 68. As illustrated in Figure 4, each angular junction module 74 cooperates with the first tank wall 30 and the second tank wall 32. The first portion 56 of the angular junction pieces 34 of each angular junction module 74 is intended to be in contact with the first tank wall 30 at the level of the first free edge 62 and of the second free edge 64. Thus, the secondary space 37 of the first portion 56 of each part forming an angular junction module 74 is arranged in the continuity of the secondary space 37 of the first tank wall 30, the primary space 41 of the first portion 56 of each part forming each angular junction module 74 also being arranged in continuity of the primary space 41 of the first wall of the tank 30. The secondary space 37 of the first portion 56 of the parts forming each angular junction module 74, in its part not covered by the primary space, is covered with the primary space 41 of the first tank wall 30 up to the first free edge 62. And similarly, the secondary space 37 of the second portion 58 of each part forming an angular junction module 74 is arranged in the continuity of the the secondary space 37 of the second tank wall 32, and the primary space 41 of the second portion 58 of each part forming an angular junction module 74 is arranged in the continuity of the primary space 41 of the second tank wall 32. The secondary space 37 of the second portion 58 of the parts forming each angular junction module 74, in its part not covered by the primary space, is covered by the primary space 41 of the second tank wall 30 up to at the third free edge 6 8.
Pour rappel, les parois latérales 30, 32 de la cuve étanche et thermiquement isolante 26 reposent directement sur les parois de portée 18, 20 de la structure porteuse interne 6. Il en est de même pour la face externe des première et deuxième portions de la pièce de jonction angulaire qui s’étendent sensiblement perpendiculairement l’une et à l’autre. Plus précisément, la face externe 29 de la première paroi latérale de cuve 30 et la face externe de la première portion 56 de la pièce de jonction angulaire reposent sur la première paroi de portée 18 de la structure porteuse interne 6 par l’intermédiaire de boudins de mastic non représentés et d’autre part la face externe 29 de la deuxième paroi latérale de cuve 32 et la face externe de la deuxième portion 58 de la pièce de jonction angulaire reposent sur la deuxième paroi de portée 20 de la structure porteuse interne 6 par l’intermédiaire de boudins de mastic non représentés. As a reminder, the side walls 30, 32 of the sealed and thermally insulating tank 26 rest directly on the bearing walls 18, 20 of the internal supporting structure 6. The same is true for the external face of the first and second portions of the angular junction piece which extend substantially perpendicular to each other. More precisely, the external face 29 of the first side wall of the tank 30 and the external face of the first portion 56 of the angular junction piece rest on the first bearing wall 18 of the internal supporting structure 6 by means of tubes of mastic not shown and on the other hand the external face 29 of the second side wall of the tank 32 and the external face of the second portion 58 of the angular junction piece rest on the second bearing wall 20 of the internal supporting structure 6 by means of mastic strands not shown.
La face externe 29 au niveau de la portion intermédiaire 60, qui s’étend dans un plan incliné par rapport aux plans d’allongement principaux des première et deuxième parois latérales de cuve, forme un chanfrein et ainsi une zone de dégagement 76 entre la portion intermédiaire 60 et la structure porteuse interne 6 au niveau de la zone de jonction 24.
Tel que cela est illustré sur la figure 4, la structure porteuse interne 6 présente dans cette zone de jonction 24, c’est-à-dire dans le coin formé entre la première paroi latérale de portée 18 et la deuxième paroi latérale de portée 20, un élément de renfort 78 qui est ménagé pour être en contact avec chacune des parois latérales de portée et avec la face externe 29 de la portion intermédiaire 60. En d’autres termes, la structure porteuse interne 6 est équipée d’un élément de renfort 78 apte à combler la zone de dégagement 76. L’élément de renfort 78 reprend ici une forme de section triangulaire similaire à celle de la zone de dégagement, en présentant une face de contact 80 susceptible de former une butée au déplacement de la portion intermédiaire sous l’effet de la pression exercée par le gaz naturel liquide présent dans la cuve, et un sommet 82 opposé, présentant un angle sensiblement égal à 90° pour venir épouser la forme de coin de la zone de jonction 24. Avantageusement, l’élément de renfort 78 s’étend principalement le long de l’axe longitudinal A, de manière à former un renfort pour chacune des pièces de jonction angulaire 34. L’élément de renfort 78 peut notamment consister en une plaque formant nervure longitudinale agencée à 135° de chacune des parois de portée de la structure porteuse interne. The outer face 29 at the level of the intermediate portion 60, which extends in a plane inclined with respect to the main extension planes of the first and second side walls of the vessel, forms a chamfer and thus a clearance zone 76 between the portion. intermediate 60 and the internal supporting structure 6 at the junction zone 24. As illustrated in FIG. 4, the internal supporting structure 6 present in this junction zone 24, that is to say in the corner formed between the first bearing side wall 18 and the second bearing side wall 20 , a reinforcing element 78 which is arranged to be in contact with each of the bearing side walls and with the external face 29 of the intermediate portion 60. In other words, the internal supporting structure 6 is equipped with a bearing element. reinforcement 78 capable of filling the clearance zone 76. The reinforcement element 78 here takes on a triangular cross-section shape similar to that of the clearance zone, by presenting a contact face 80 capable of forming a stop for the movement of the portion. intermediate under the effect of the pressure exerted by the liquid natural gas present in the tank, and an opposite apex 82, having an angle substantially equal to 90 ° to come to match the wedge shape of the junction zone 24. Advantageously, the element nt of reinforcement 78 extends mainly along the longitudinal axis A, so as to form a reinforcement for each of the angular junction pieces 34. The reinforcement element 78 may in particular consist of a plate forming a longitudinal rib arranged at 135 ° each of the span walls of the internal load-bearing structure.
Tel que plus particulièrement visible sur la figure 4, la face de contact 80 est en regard de la portion intermédiaire 60 de la pièce de jonction angulaire 34. Dans une position d’origine, sans pression exercée sur la pièce de jonction angulaire par du gaz liquide, l’élément de renfort 78 et la pièce de jonction angulaire 34 participent à délimiter un espace s’étendant entre la face de contact 80 de l’élément de renfort et la face externe 29 de la portion intermédiaire 60 de la pièce de jonction angulaire 34. Cet espace est ici régulier le long de deux faces, c’est-à-dire qu’une dimension mesurée entre la face de contact 80 et la face externe 29 de la portion intermédiaire 60 le long d’un axe perpendiculaire au plan d’extension principal de la face de contact 80 de l’élément de renfort 78 et/ou de la face externe 29 de la portion intermédiaire 60 est constante. Autrement dit, la face de contact 80 de l’élément de renfort 78 et la face externe 29 de la portion intermédiaire 60 s’étendent chacune dans un plan parallèle au plan dans lequel s’inscrit l’autre face.
La pression exercée sur la face interne 27 de la portion intermédiaire 60 par le gaz liquide implique alors un contact plan directement entre la face externe 29 de la portion intermédiaire 60 et la face de contact 80 de l’élément de renfort 78. As more particularly visible in FIG. 4, the contact face 80 is opposite the intermediate portion 60 of the angular junction piece 34. In an original position, without pressure exerted on the angular junction piece by gas liquid, the reinforcing element 78 and the angular junction piece 34 participate in delimiting a space extending between the contact face 80 of the reinforcing element and the outer face 29 of the intermediate portion 60 of the junction piece angular 34. This space is here regular along two faces, that is to say a dimension measured between the contact face 80 and the outer face 29 of the intermediate portion 60 along an axis perpendicular to the main extension plane of the contact face 80 of the reinforcing element 78 and / or of the outer face 29 of the intermediate portion 60 is constant. In other words, the contact face 80 of the reinforcing element 78 and the outer face 29 of the intermediate portion 60 each extend in a plane parallel to the plane in which the other face is inscribed. The pressure exerted on the internal face 27 of the intermediate portion 60 by the liquid gas then implies a plane contact directly between the external face 29 of the intermediate portion 60 and the contact face 80 of the reinforcing element 78.
Ainsi, la face externe 29 de la portion intermédiaire 60 de la pluralité de pièces de jonction angulaire 34 repose sur l’élément de renfort 78. La pression exercée par le gaz naturel liquide stocké dans la cuve étanche et thermiquement isolante 26 sur la face interne 27 de la portion intermédiaire 60 est alors répartie plus facilement sur la face externe 29 de chaque portion de la pièce de jonction angulaire 34 correspondante, l’élément de renfort 78 formant au niveau de la face de contact une face sensiblement perpendiculaire à la direction générale de la pression du gaz naturel liquide dans cette zone de jonction 24 de la cuve. La pression exercée par le gaz naturel liquide stockée dans la cuve étanche et thermiquement isolante 26 est ainsi mieux répartie et réduit les risques d’apparition de fuite de la membrane d’étanchéité primaire 42. Thus, the external face 29 of the intermediate portion 60 of the plurality of angular junction pieces 34 rests on the reinforcing element 78. The pressure exerted by the liquid natural gas stored in the sealed and thermally insulating tank 26 on the internal face 27 of the intermediate portion 60 is then distributed more easily over the outer face 29 of each portion of the corresponding angular junction piece 34, the reinforcing element 78 forming at the level of the contact face a face substantially perpendicular to the general direction the pressure of the liquid natural gas in this junction zone 24 of the tank. The pressure exerted by the liquid natural gas stored in the sealed and thermally insulating tank 26 is thus better distributed and reduces the risk of the primary sealing membrane 42 appearing to leak.
Avantageusement, cette répartition de la pression sur différents éléments de la cuve étanche et thermiquement isolante 26 et de la structure porteuse interne 6 influence la concentration de raidisseurs 8, 10 précédemment évoqués et plus particulièrement la concentration d’une première pluralité de raidisseurs 8 disposée entre la coque externe 4 et la première paroi de portée 18 de la structure porteuse interne 6 et la concentration d’une deuxième pluralité de raidisseurs 10 disposée entre la coque externe 4 et la deuxième paroi de portée 20 de la structure porteuse interne 6. Advantageously, this distribution of the pressure on various elements of the sealed and thermally insulating tank 26 and of the internal supporting structure 6 influences the concentration of stiffeners 8, 10 previously mentioned and more particularly the concentration of a first plurality of stiffeners 8 arranged between the outer shell 4 and the first bearing wall 18 of the internal supporting structure 6 and the concentration of a second plurality of stiffeners 10 arranged between the outer shell 4 and the second bearing wall 20 of the internal supporting structure 6.
Tel que cela est notamment visible sur les figures 2 et 4, il est dès lors moins nécessaire d’avoir des raidisseurs 8, 10 au voisinage de la zone de jonction 24, et seul un premier raidisseur 84, 90 de chaque pluralité de raidisseurs 8, 10 peut être en contact avec la paroi de portée 18, 20 correspondante de la structure porteuse interne 6 au niveau de la zone de jonction 24 alors que plusieurs raidisseurs 86, 88, 92, 94 peuvent être en contact de l’une des parois de portée 18, 20, à distance de cette zone de jonction 24. La concentration de raidisseurs est ainsi réduite à proximité de la pièce de jonction angulaire.
Pour chaque pluralité de raidisseurs, respectivement en regard d’une ou l’autre des parois de portée 18, 20, un deuxième raidisseur 86, 92 se positionne entre le premier raidisseur 84, 90 et un troisième raidisseur 88, 94. Par concentration de raidisseurs réduite au niveau de la zone de jonction et de la pièce de jonction angulaire, on comprend que la distance séparant le deuxième raidisseur 86, 92 et le troisième raidisseur 88, 94 est plus petite que la distance séparant le deuxième raidisseur 86, 92 du premier raidisseur 84, 90. As can be seen in particular in FIGS. 2 and 4, it is therefore less necessary to have stiffeners 8, 10 in the vicinity of the junction zone 24, and only a first stiffener 84, 90 of each plurality of stiffeners 8 , 10 may be in contact with the corresponding bearing wall 18, 20 of the internal bearing structure 6 at the level of the junction zone 24 while several stiffeners 86, 88, 92, 94 may be in contact with one of the walls bearing range 18, 20, at a distance from this junction zone 24. The concentration of stiffeners is thus reduced near the angular junction piece. For each plurality of stiffeners, respectively facing one or the other of the bearing walls 18, 20, a second stiffener 86, 92 is positioned between the first stiffener 84, 90 and a third stiffener 88, 94. By concentration of stiffeners reduced at the junction zone and the angular junction piece, it is understood that the distance separating the second stiffener 86, 92 and the third stiffener 88, 94 is smaller than the distance separating the second stiffener 86, 92 from the first stiffener 84, 90.
Dans l’exemple illustré sur la figure 4, le premier raidisseur 84, 90 de chaque pluralité de raidisseurs est en contact de la paroi latérale de portée de la structure porteuse interne 6 au niveau de l’élément de renfort 78, sans que cela soit limitatif de l’invention. In the example illustrated in FIG. 4, the first stiffener 84, 90 of each plurality of stiffeners is in contact with the bearing side wall of the internal supporting structure 6 at the level of the reinforcing element 78, without this being limitative of the invention.
Tel qu’illustré sur la figure 7, et tel que cela est visible sur la figure 2, ce premier raidisseur 84, 90 peut s’étendre au niveau de la zone de jonction à distance de l’élément de renfort et plus particulièrement dans une zone recouverte par la première portion ou la deuxième portion de la pièce de jonction angulaire. As illustrated in FIG. 7, and as can be seen in FIG. 2, this first stiffener 84, 90 can extend at the level of the junction zone at a distance from the reinforcing element and more particularly in a zone covered by the first portion or the second portion of the angular junction piece.
On peut définir pour chaque paroi latérale 18, 20 de la cuve une zone proximale 101 et une zone distale 103 en fonction de leur agencement par rapport à la zone de jonction 24 la plus proche, ces deux zones étant délimitées l’une par rapport à l’autre par une démarcation dans le prolongement du bord libre de l’espace secondaire de la pièce de jonction angulaire, à savoir le deuxième bord libre 64 pour la première paroi latérale de cuve 18 et le quatrième bord libre 70 pour la deuxième paroi latérale de cuve 20. La zone proximale 101 consiste en la zone s’étendant entre la zone de jonction 24 et cette démarcation et la zone distale 103 consiste en la zone s’éloignant de la zone de jonction depuis cette démarcation. Tel qu’illustré ici sur la figure 7, seul le premier raidisseur 84, 90 est avantageusement situé dans la zone proximale 101, alors que plusieurs raidisseurs 86, 88, 92, 94, sont disposés dans la zone distale 103. Comme décrit ci-dessus, la distance entre le premier raidisseur 84, 90 et le deuxième raidisseur 86, 92 est plus grande que la distance séparant le deuxième raidisseur 86, 92 du troisième raidisseur 88, 94. Le premier raidisseur 84 de la première pluralité de raidisseurs 8 peut notamment être disposé dans l’alignement transversal du premier bord libre 62 de la pièce de
jonction angulaire 34 et le premier raidisseur 90 de la deuxième pluralité de raidisseurs 10 peut notamment être disposé dans l’alignement vertical du troisième bord libre 68 de la pièce de jonction angulaire 34. It is possible to define for each side wall 18, 20 of the vessel a proximal zone 101 and a distal zone 103 according to their arrangement with respect to the nearest junction zone 24, these two zones being delimited one with respect to the other by a demarcation in the extension of the free edge of the secondary space of the angular junction piece, namely the second free edge 64 for the first side wall of the tank 18 and the fourth free edge 70 for the second side wall of vessel 20. The proximal zone 101 consists of the zone extending between the junction zone 24 and this demarcation and the distal zone 103 consists of the zone moving away from the junction zone from this demarcation. As illustrated here in FIG. 7, only the first stiffener 84, 90 is advantageously located in the proximal zone 101, while several stiffeners 86, 88, 92, 94, are arranged in the distal zone 103. As described above- above, the distance between the first stiffener 84, 90 and the second stiffener 86, 92 is greater than the distance separating the second stiffener 86, 92 from the third stiffener 88, 94. The first stiffener 84 of the first plurality of stiffeners 8 can in particular be arranged in the transverse alignment of the first free edge 62 of the piece of angular junction 34 and the first stiffener 90 of the second plurality of stiffeners 10 can in particular be arranged in vertical alignment with the third free edge 68 of the angular junction piece 34.
Tel qu’illustré sur la figure 7, au moins un premier raidisseur d’une pluralité de raidisseurs 8, 10 est positionné à une distance d du coin de la structure porteuse interne 6, c’est-à-dire du sommet 82 de l’élément de renfort 78 et le premier raidisseur 84, 90. Plus particulièrement, dans l’exemple illustré, chaque premier raidisseur des pluralités de raidisseurs est disposé à cette même distance d du coin de la structure porteuse interne 6. As illustrated in Figure 7, at least a first stiffener of a plurality of stiffeners 8, 10 is positioned at a distance d from the corner of the internal load-bearing structure 6, i.e. from the top 82 of the. 'reinforcing element 78 and the first stiffener 84, 90. More particularly, in the example illustrated, each first stiffener of the plurality of stiffeners is arranged at this same distance d from the corner of the internal supporting structure 6.
Selon une caractéristique de l’invention, des dimensions de la pièce de jonction angulaire sont déterminées en fonction de ce positionnement des premiers raidisseurs et de cette distance d. Plus particulièrement, on peut calculer une dimension D60 de la portion intermédiaire 60, mesurée le long de la face externe 29 de la portion intermédiaire 60 entre le premier bord lié 66 et le deuxième bord lié 72, de sorte que :
According to one characteristic of the invention, the dimensions of the angular junction part are determined as a function of this positioning of the first stiffeners and of this distance d. More particularly, one can calculate a dimension D60 of the intermediate portion 60, measured along the outer face 29 of the intermediate portion 60 between the first bonded edge 66 and the second bonded edge 72, so that:
Dans l’exemple illustré, des dimensions D56, D58 de la première portion 56 et de la deuxième portion 58, respectivement mesurées entre la portion intermédiaire et une zone correspondant à la position du premier raidisseur 84, 90 correspondant, sont équivalentes à la dimension D60 de la portion intermédiaire préalablement déterminée. Plus particulièrement, une dimension D56 de la première portion 56, mesurée ici verticalement le long de la surface externe entre le premier bord lié 66 et la zone de contact avec le premier raidisseur 84 de la première pluralité de raidisseurs 8, c’est-à-dire au droit du premier bord libre 62, présente une valeur équivalente à la valeur de la dimension D60 de la portion intermédiaire. Et une dimension D58 de la deuxième portion 58, mesurée ici transversalement le long de la surface externe entre le deuxième bord lié 72 et la zone de contact avec le premier raidisseur 90 de la deuxième pluralité de raidisseurs 10, c’est-à-dire au droit du troisième bord libre 68, présente une valeur équivalente à la valeur des dimensions D60 et D56 précédemment évoquées.
De la sorte, les efforts exercées par la pression du gaz liquide sont plus équitablement répartis entre l’élément de renfort dans la zone de jonction et chacune des parois latérales de cuve et les raidisseurs sur lesquels ces parois latérales reposent. In the example illustrated, dimensions D56, D58 of the first portion 56 and of the second portion 58, respectively measured between the intermediate portion and a zone corresponding to the position of the corresponding first stiffener 84, 90, are equivalent to dimension D60 of the pre-determined intermediate portion. More particularly, a dimension D56 of the first portion 56, here measured vertically along the outer surface between the first bonded edge 66 and the zone of contact with the first stiffener 84 of the first plurality of stiffeners 8, that is to say ie to the right of the first free edge 62, has a value equivalent to the value of the dimension D60 of the intermediate portion. And a dimension D58 of the second portion 58, measured here transversely along the outer surface between the second bonded edge 72 and the area of contact with the first stiffener 90 of the second plurality of stiffeners 10, that is to say to the right of the third free edge 68, has a value equivalent to the value of the dimensions D60 and D56 previously mentioned. In this way, the forces exerted by the pressure of the liquid gas are more evenly distributed between the reinforcing element in the junction zone and each of the side walls of the tank and the stiffeners on which these side walls rest.
Dans une variante des modes de réalisation précédemment décrits et tel qu’illustré sur la figure 8, la face de contact 80 de l’élément de renfort 78 présente une forme distincte de la surface plane précédemment évoquée, en formant un congé 91 plutôt qu’un coin en équerre. Plus particulièrement, la face de contact 80 présente une courbure avantageusement concave, de sorte que l’espace délimité entre la face de contact 80 de l’élément de renfort 78 et la face externe 29 de la portion intermédiaire 60 n’est plus constant et va en s’agrandissant au fur et à mesure qu’on se rapproche du centre de la portion intermédiaire 60. Cet espace est comblé par une ou plusieurs cales 93, par exemple sous la forme de panneaux et/ou de cylindres de contre-plaqué de bois par exemple, et/ou par du matériau de ragréage 95, comme du mastic par exemple illustré sur la figure 8 par une zone hachurée, étant entendu que cette liste n’étant pas exhaustive. Il convient de noter que la structure de l’élément de renfort est plus facile à réaliser lorsqu’elle présente un congé et qu’elle présente moins de risques de cassure à la jonction avec les parois de portée de la structure porteuse sous l’effet de la pression exercée par le gaz liquide, la présence additionnelle de matériau de renfort comblant l’espace permettant de s’assurer de la bonne transmission des efforts. In a variant of the embodiments previously described and as illustrated in FIG. 8, the contact face 80 of the reinforcing element 78 has a shape distinct from the flat surface previously mentioned, forming a fillet 91 rather than a square corner. More particularly, the contact face 80 has an advantageously concave curvature, so that the space delimited between the contact face 80 of the reinforcing element 78 and the outer face 29 of the intermediate portion 60 is no longer constant and increases as one approaches the center of the intermediate portion 60. This space is filled by one or more shims 93, for example in the form of plywood panels and / or cylinders of wood for example, and / or by leveling material 95, such as mastic for example illustrated in FIG. 8 by a hatched zone, it being understood that this list is not exhaustive. It should be noted that the structure of the reinforcing element is easier to produce when it has a fillet and that it presents less risk of breakage at the junction with the bearing walls of the supporting structure under the effect of the pressure exerted by the liquid gas, the additional presence of reinforcing material filling the space making it possible to ensure the good transmission of the forces.
On va maintenant décrire une variante de réalisation de l’invention, en référence aux figures 5 et 6. Chaque module de jonction angulaire 74 qui a été décrit ci- dessus est ménagé pour assurer la jonction entre la première paroi de cuve 30 et la deuxième paroi de cuve 32 de la cuve étanche et thermiquement isolante 26. Cependant, il n’est pas exclu que la cuve 26 présente d’autres parois de cuve et que des modules de jonction angulaire 74 selon l’invention soient configurés pour être positionnés en outre en regard d’une deuxième zone de jonction de parois de cuve. A variant embodiment of the invention will now be described with reference to FIGS. 5 and 6. Each angular junction module 74 which has been described above is provided to ensure the junction between the first tank wall 30 and the second. tank wall 32 of the sealed and thermally insulating tank 26. However, it is not excluded that the tank 26 has other tank walls and that the angular junction modules 74 according to the invention are configured to be positioned in further facing a second junction zone of the vessel walls.
Dans cet exemple, la pluralité de parois de cuve comprend en outre une troisième paroi de cuve, ou première paroi transversale de cuve 96, s’étendant dans un plan
perpendiculaire à la première paroi latérale 30 et perpendiculaire à la deuxième paroi latérale 32. Par ailleurs, cette première paroi transversale de cuve 96 est perpendiculaire à l’axe d’extension principale de la pluralité de pièces de jonction angulaire 34, c’est-à-dire l’axe longitudinal A. In this example, the plurality of vessel walls further comprises a third vessel wall, or first transverse vessel wall 96, extending in a plane. perpendicular to the first side wall 30 and perpendicular to the second side wall 32. Furthermore, this first transverse tank wall 96 is perpendicular to the main axis of extension of the plurality of angular junction pieces 34, that is- i.e. the longitudinal axis A.
On comprend que selon l’invention, chaque paroi de la cuve étanche 26 peut être reliée à une autre paroi de la cuve étanche 26 par un module de jonction angulaire 74. Selon l’exemple décrit ici, la jonction entre la troisième paroi de cuve 96 et la première paroi de cuve 30 peut présenter un module de jonction angulaire 74, tout comme la jonction entre la troisième paroi de cuve 96 et la deuxième paroi de cuve 32. It is understood that according to the invention, each wall of the sealed tank 26 can be connected to another wall of the sealed tank 26 by an angular junction module 74. According to the example described here, the junction between the third tank wall 96 and the first vessel wall 30 may have an angular junction module 74, just like the junction between the third vessel wall 96 and the second vessel wall 32.
Dans ce contexte, la cuve étanche et thermiquement isolante 26 selon l’invention comprend un élément de jonction angulaire 98 qui diffère de la pièce de jonction angulaire 34 en la présence d’une partie de renvoi. In this context, the sealed and thermally insulating tank 26 according to the invention comprises an angular junction element 98 which differs from the angular junction piece 34 in the presence of a return part.
Tel qu’illustré sur la figure 5, l’élément de jonction angulaire 98 comprend une première partie 100 et une deuxième partie 102. Chacune des deux parties 100 et 102 présente une structure sensiblement équivalente à ce qui vient d’être décrit, à savoir, depuis une face externe 29 vers une face interne 27, une espace secondaire 37, comportant la barrière d’isolation thermique secondaire 36 et la membrane d’étanchéité secondaire 38, et une espace primaire 41, comportant la barrière d’isolation thermique primaire 40 et la membrane d’étanchéité primaire 42. As illustrated in FIG. 5, the angular junction element 98 comprises a first part 100 and a second part 102. Each of the two parts 100 and 102 has a structure substantially equivalent to what has just been described, namely , from an external face 29 towards an internal face 27, a secondary space 37, comprising the secondary thermal insulation barrier 36 and the secondary waterproofing membrane 38, and a primary space 41, comprising the primary thermal insulation barrier 40 and the primary waterproofing membrane 42.
Pour rappel, la barrière d’isolation thermique secondaire 36 comprend, de la face externe 29 vers la face interne 27, la paroi d’isolation 44 recouverte de la première couche d’isolant thermique 46, puis de la deuxième paroi d’isolation 51 présente spécifiquement dans l’élément de jonction angulaire conformément à ce qui a été décrit précédemment pour la pièce de jonction angulaire. Cette barrière d’isolation thermique secondaire 36 assure un premier maintien de la température à l’intérieur de la cuve étanche et thermiquement isolante 26, avantageusement quand du gaz naturel liquide y est stocké. La barrière d’isolation thermique secondaire 36 est recouverte par la membrane d’étanchéité secondaire 38.
La membrane d’étanchéité secondaire 38 assure la conservation du gaz naturel liquide stocké dans la cuve étanche et thermiquement isolante 26 lorsqu’une fuite de gaz naturel liquide survient dans l’espace primaire 41. As a reminder, the secondary thermal insulation barrier 36 comprises, from the external face 29 towards the internal face 27, the insulation wall 44 covered with the first layer of thermal insulation 46, then with the second insulation wall 51 present specifically in the angular junction element in accordance with what has been described above for the angular junction piece. This secondary thermal insulation barrier 36 ensures a first maintenance of the temperature inside the sealed and thermally insulating tank 26, advantageously when liquid natural gas is stored there. The secondary thermal insulation barrier 36 is covered by the secondary waterproofing membrane 38. The secondary sealing membrane 38 ensures the conservation of the liquid natural gas stored in the sealed and thermally insulating tank 26 when a leak of liquid natural gas occurs in the primary space 41.
La membrane d’étanchéité secondaire 38 comprend une membrane d’étanchéité secondaire souple 48 en recouvrement d’une pluralité de membranes d’étanchéité secondaires rigides 49. The secondary waterproofing membrane 38 includes a flexible secondary waterproofing membrane 48 overlying a plurality of rigid secondary waterproofing membranes 49.
La bande de triplex formant la première membrane d’étanchéité souple 48 est destinée à être collée d’une part aux membranes d’étanchéité secondaires rigides 49, et plus particulièrement en recouvrement des zones de jonctions de ces membranes rigides, et d’autre part à la barrière d’isolation thermique primaire 40, empêchant ainsi des contaminations au niveau des différentes jonctions. La barrière d’isolation thermique primaire 40 comporte ainsi, de la face externe 29 vers la face interne 27, la deuxième couche d’isolant thermique 52 et la troisième paroi d’isolation 54. La barrière d’isolation thermique primaire 40 est recouverte par la membrane d’étanchéité primaire 42. The triplex strip forming the first flexible waterproofing membrane 48 is intended to be bonded on the one hand to the rigid secondary waterproofing membranes 49, and more particularly to cover the junction areas of these rigid membranes, and on the other hand to the primary thermal insulation barrier 40, thus preventing contamination at the various junctions. The primary thermal insulation barrier 40 thus comprises, from the external face 29 towards the internal face 27, the second layer of thermal insulation 52 and the third insulation wall 54. The primary thermal insulation barrier 40 is covered by the primary waterproofing membrane 42.
Comme précisé ci-dessus, l’élément de jonction angulaire 98 comprend une première partie 100 et une deuxième partie 102. La première partie 100 de l’élément de jonction angulaire 98 est ménagée pour s’aligner et coopérer avec la pluralité de pièces ou modules de jonction angulaire 34, 74, ainsi qu’avec la première paroi latérale de cuve 30 et la deuxième paroi latérale de cuve 32. La deuxième partie 102 de l’élément de jonction angulaire 98 est ménagée perpendiculairement à la première partie 100 de manière à s’étendre en regard de la première paroi transversale de cuve 96. As specified above, the angular junction element 98 comprises a first part 100 and a second part 102. The first part 100 of the angular junction element 98 is provided to align and cooperate with the plurality of parts or angular junction modules 34, 74, as well as with the first side wall of tank 30 and the second side wall of tank 32. The second part 102 of the angular junction element 98 is formed perpendicular to the first part 100 so to extend opposite the first transverse vessel wall 96.
La première partie 100 de l’élément de jonction angulaire 98 comporte, comme pour la pièce de jonction angulaire 34, une première section 104, une deuxième section 106 et au moins une section intermédiaire 108. The first part 100 of the angular junction element 98 comprises, as for the angular junction part 34, a first section 104, a second section 106 and at least one intermediate section 108.
La première section 104 de l’élément de jonction angulaire 98 s’étend principalement dans un plan parallèle au plan d’allongement principale de la première paroi latérale de cuve 30 et de la première portion 56 des pièces de jonction angulaire 34 et comme précédemment, l’espace primaire 41 et l’espace
secondaire 37 ne présentent pas les mêmes dimensions, aussi bien par rapport à l’axe longitudinal A que par rapport à l’axe vertical C, étant entendu que le plan d’allongement principal de la première paroi latérale de cuve 30 s’étend ici longitudinalement et verticalement. The first section 104 of the angular junction element 98 extends mainly in a plane parallel to the main extension plane of the first side wall of the tank 30 and of the first portion 56 of the angular junction pieces 34 and as before, primary space 41 and space secondary 37 do not have the same dimensions, both with respect to the longitudinal axis A and with respect to the vertical axis C, it being understood that the main extension plane of the first side wall of tank 30 extends here longitudinally and vertically.
La première section 104 présente un premier bord d’extrémité libre 110 et un deuxième bord d’extrémité libre 112, ces bords d’extrémité étant perpendiculaires l’un à l’autre. L’espace secondaire 37 de la première section 104 n’est pas recouverte de l’espace primaire 41 au voisinage du premier bord d’extrémité libre 110 et au voisinage du deuxième bord d’extrémité libre 112. The first section 104 has a first free end edge 110 and a second free end edge 112, these end edges being perpendicular to each other. The secondary space 37 of the first section 104 is not covered with the primary space 41 in the vicinity of the first free end edge 110 and in the vicinity of the second free end edge 112.
La deuxième section 106 présente une forme équivalente à celle de la première section 104, avec un troisième bord d’extrémité libre 116 et un quatrième bord d’extrémité libre 118. Là encore, l’espace secondaire 37 n’est pas recouverte par l’espace primaire 41 au voisinage du troisième et du quatrième bord d’extrémité libre. The second section 106 has a shape equivalent to that of the first section 104, with a third free end edge 116 and a fourth free end edge 118. Again, the secondary space 37 is not covered by the. 'primary space 41 in the vicinity of the third and fourth free end edge.
La première section 104 et la deuxième section 106 de l’élément de jonction angulaire 98 s’étendent principalement dans des plans perpendiculaires l’un par rapport à l’autre. La première section 104 n’est pas adjacente à la deuxième section 106, du fait de la présence de la section intermédiaire dont sont respectivement solidaires la première section 104 et la deuxième section 106 au niveau d’un côté lié respectif 114, 120. The first section 104 and the second section 106 of the angular junction member 98 extend mainly in planes perpendicular to each other. The first section 104 is not adjacent to the second section 106, due to the presence of the intermediate section of which the first section 104 and the second section 106 are respectively secured at a respective linked side 114, 120.
La section intermédiaire 108 s’étend principalement dans un plan incliné, sécant d’une part au plan principal d’allongement de la première section 104 et d’autre part au plan d’allongement principal de la deuxième section 106. Le plan sécant est parallèle à l’axe longitudinal A et est orienté de telle façon à présenter avantageusement un angle d’environ 135° avec chacun des plans d’allongement principal évoqués précédemment. La section intermédiaire 108 est ainsi sécante à la première section 104 avantageusement selon un angle d’environ 135° tout en étant également sécante à la deuxième section 106 avantageusement selon un angle d’environ 135°.
L’espace secondaire 37 n’est pas recouverte de l’espace primaire 41 au niveau d’un cinquième côté libre 115 de la section intermédiaire 108. En effet, l’espace primaire 41 et l’espace secondaire 37 ne s’étendent pas sur la même longueur le long de l’axe longitudinal A. L’espace primaire 41 est plus courte que l’espace secondaire 37 le long de l’axe longitudinal A vers le cinquième côté libre 115 de la section intermédiaire 108. Ainsi, la membrane d’étanchéité secondaire 38 est découverte au niveau du cinquième côté libre 115 sans élément superposé et/ou collé. The intermediate section 108 extends mainly in an inclined plane, secant on the one hand to the main elongation plane of the first section 104 and on the other hand to the main elongation plane of the second section 106. The secant plane is parallel to the longitudinal axis A and is oriented so as to advantageously present an angle of approximately 135 ° with each of the main elongation planes mentioned above. The intermediate section 108 is thus secant to the first section 104 advantageously at an angle of about 135 ° while also being secant to the second section 106, advantageously at an angle of about 135 °. The secondary space 37 is not covered with the primary space 41 at the level of a fifth free side 115 of the intermediate section 108. Indeed, the primary space 41 and the secondary space 37 do not extend. on the same length along the longitudinal axis A. The primary space 41 is shorter than the secondary space 37 along the longitudinal axis A towards the fifth free side 115 of the intermediate section 108. Thus, the secondary waterproofing membrane 38 is uncovered at the fifth free side 115 without any superimposed and / or glued element.
Là encore, la section intermédiaire 108 présente une dimension qui va en s’agrandissant au fur et à mesure de son éloignement de la face interne 27, afin notamment de répartir au mieux les pressions exercées par le gaz naturel liquide présent dans la cuve, tel que cal a pu être décrit précédemment. Et il convient de noter que dans cette variante de réalisation la section intermédiaire 108 est là encore en regard d’une zone de dégagement qui peut être remplie d’un élément de renfort contre lequel s’appuie l’élément de jonction au niveau de la face externe de la section intermédiaire. De plus, l’élément de renfort peut présenter une face de contact s’étendant dans un plan ou en formant un congé, tel que décrit ci-dessus, la section intermédiaire 108 pouvant comprendre des cales et/ou du matériau de ragréage pour combler l’espace entre la face externe 29 et la face de contact de l’élément de renfort. Here again, the intermediate section 108 has a dimension which increases as it moves away from the internal face 27, in particular in order in particular to best distribute the pressures exerted by the liquid natural gas present in the tank, such as that cal could be described previously. And it should be noted that in this variant embodiment, the intermediate section 108 is again facing a clearance zone which can be filled with a reinforcing element against which the junction element rests at the level of the outer face of the intermediate section. In addition, the reinforcing element can have a contact face extending in a plane or forming a fillet, as described above, the intermediate section 108 being able to include shims and / or patching material to fill. the space between the outer face 29 and the contact face of the reinforcing element.
La deuxième partie 102 de l’élément de jonction 98 s’étend principalement dans un plan perpendiculaire à l’axe longitudinal A, c’est-à-dire dans un plan perpendiculaire à chacune des sections de la première partie 100 de l’élément de jonction. Autrement dit, la deuxième partie 102 de l’élément de jonction angulaire 98 forme une partie de renvoi qui prolonge perpendiculairement la première partie 100 de l’élément de jonction angulaire 98. The second part 102 of the junction element 98 extends mainly in a plane perpendicular to the longitudinal axis A, that is to say in a plane perpendicular to each of the sections of the first part 100 of the element junction. In other words, the second part 102 of the angular junction element 98 forms a deflection part which extends perpendicularly the first part 100 of the angular junction element 98.
Plus particulièrement, la deuxième partie 102 comprend une paroi de renvoi 121 présentant un côté transversal libre 122, un côté transversal lié 124, un côté vertical libre 126 et un côté vertical lié 128. Le côté transversal libre 122 et le côté transversal lié 124 s’étendent le long d’un axe transversal B, perpendiculaire à l’axe longitudinal A et à l’axe vertical C, tandis que le côté vertical libre 126 et le côté
vertical lié 128 s’étendent le long de l’axe vertical C. La deuxième partie 102 est solidaire de la première partie 100 au niveau du côté transversal lié 124 et du côté vertical lié 128. More particularly, the second part 102 comprises a return wall 121 having a free transverse side 122, a linked transverse side 124, a free vertical side 126 and a linked vertical side 128. The free transverse side 122 and the linked transverse side 124. 'extend along a transverse axis B, perpendicular to the longitudinal axis A and the vertical axis C, while the free vertical side 126 and the side vertical linked 128 extend along the vertical axis C. The second part 102 is integral with the first part 100 at the level of the linked transverse side 124 and the linked vertical side 128.
L’espace secondaire 37 n’est pas recouverte de l’espace primaire 41 au niveau du côté transversal libre 122 et du côté vertical libre 126 de la deuxième partie 102 de l’élément de jonction angulaire 98. En effet, l’espace primaire 41 et l’espace secondaire 37 ne s’étendent pas sur la même longueur le long de l’axe transversal B et le long de l’axe vertical C. Comme précédemment, l’espace primaire 41 est plus courte que l’espace secondaire 37, ici le long de l’axe transversal B vers le côté vertical libre 126 et également plus courte le long de l’axe vertical C vers le côté transversal libre 122. The secondary space 37 is not covered with the primary space 41 at the level of the free transverse side 122 and of the free vertical side 126 of the second part 102 of the angular junction element 98. Indeed, the primary space 41 and the secondary space 37 do not extend the same length along the transverse axis B and along the vertical axis C. As before, the primary space 41 is shorter than the secondary space 37, here along the transverse axis B to the free vertical side 126 and also shorter along the vertical axis C to the free transverse side 122.
L’élément de jonction angulaire 98 selon l’invention a pour but d’optimiser la répartition de la pression exercée par le gaz naturel liquide sur les zones de jonction des parois constitutives de ladite cuve 26, notamment par la forme de la section intermédiaire 108 et la zone de dégagement entre cette section intermédiaire et la zone de jonction des parois de portée 18, 20, tout réalisant une liaison entre la première paroi transversale de cuve 96 et la pluralité de modules de jonction angulaire 74. La pression exercée par le gaz naturel liquide stocké dans la cuve étanche et thermiquement isolante 26 sur la face interne 27 au niveau de la section intermédiaire 108 de l’élément de jonction angulaire 98 est répartie sur l’ensemble de l’élément de jonction angulaire 98, et jusqu’à la paroi de renvoi 121 qui s’étend en regard de la première paroi transversale de cuve 96. The purpose of the angular junction element 98 according to the invention is to optimize the distribution of the pressure exerted by the liquid natural gas on the junction zones of the constituent walls of said tank 26, in particular by the shape of the intermediate section 108 and the clearance zone between this intermediate section and the junction zone of the bearing walls 18, 20, while providing a connection between the first transverse vessel wall 96 and the plurality of angular junction modules 74. The pressure exerted by the gas natural liquid stored in the sealed and thermally insulating tank 26 on the internal face 27 at the level of the intermediate section 108 of the angular junction element 98 is distributed over the whole of the angular junction element 98, and up to the return wall 121 which extends opposite the first transverse wall of the tank 96.
L’espace primaire 41 de la première partie 100 et l’espace primaire de la deuxième partie 102 de l’élément de jonction angulaire 98 peuvent être d’un même tenant. En particulier, la membrane d’étanchéité primaire 42 au niveau de la première partie 100 peut être soudée à la membrane d’étanchéité primaire 42 de la deuxième partie 102, ou être réalisé comme un unique élément. The primary space 41 of the first part 100 and the primary space of the second part 102 of the angular junction element 98 can be one piece. In particular, the primary sealing membrane 42 at the first part 100 can be welded to the primary sealing membrane 42 of the second part 102, or be made as a single element.
Tel que représenté sur la figure 6, la première partie 100 de l’élément de jonction angulaire 98 est destinée à être en contact avec une pièce de jonction angulaire 34 d’un module de jonction angulaire 74. La première portion 56, la deuxième portion 58 et la portion intermédiaire 60 du module de jonction angulaire 74 le plus proche
de l’élément de jonction angulaire 98 s’alignent respectivement avec la première section 104, la deuxième section 106 et la section intermédiaire 108 de la première partie 100 de l’élément de jonction angulaire 98. Plus particulièrement, l’espace secondaire 37 de l’élément de jonction angulaire 98 est en contact avec l’espace secondaire de ce module de jonction angulaire 74. Pour solidariser l’élément de jonction angulaire 98 à ce module de jonction angulaire 74, des panneaux d’espace primaire 41 , ici non représentés, sont fixés par collage et soudage sur l’espace secondaire 37 entre l’espace primaire 41 associée au module de jonction angulaire 74 et l’espace primaire 41 associée à l’élément de jonction angulaire 98. As shown in Figure 6, the first part 100 of the angular junction element 98 is intended to be in contact with an angular junction piece 34 of an angular junction module 74. The first portion 56, the second portion 58 and the intermediate portion 60 of the closest angular junction module 74 of the angular junction element 98 align respectively with the first section 104, the second section 106 and the intermediate section 108 of the first part 100 of the angular junction element 98. More particularly, the secondary space 37 of the angular junction element 98 is in contact with the secondary space of this angular junction module 74. To secure the angular junction element 98 to this angular junction module 74, primary space panels 41, here not shown, are fixed by gluing and welding on the secondary space 37 between the primary space 41 associated with the angular junction module 74 and the primary space 41 associated with the angular junction element 98.
La première section 104 de l’élément de jonction angulaire 98 et la première portion 56 des pièces de jonction angulaire 34 sont destinées à être en contact avec la première paroi latérale de cuve 30. La fixation de l’élément de jonction angulaire 98 et des pièces de jonction angulaire 34 à la première paroi latérale de cuve 30 se réalise de façon similaire à la fixation de l’élément de jonction angulaire 98 avec le module de jonction angulaire 74 le plus proche. Un panneau de l’espace primaire 41 est collé et soudé au niveau de la liaison entre la première paroi latérale de cuve 30 et l’élément de jonction angulaire 98 et la pluralité de pièces de jonction angulaire 34. The first section 104 of the angular junction element 98 and the first portion 56 of the angular junction pieces 34 are intended to be in contact with the first side wall of the vessel 30. The fixing of the angular junction element 98 and the angular junction pieces 34 to the first side wall of the tank 30 is carried out in a similar way to the fixing of the angular junction element 98 with the nearest angular junction module 74. A panel of the primary space 41 is glued and welded at the connection between the first side wall of the vessel 30 and the angular junction element 98 and the plurality of angular junction pieces 34.
La deuxième section 106 de l’élément de jonction angulaire 98 et la deuxième portion 58 des pièces de jonction angulaire 74 sont destinées à être en contact avec la deuxième paroi latérale de cuve 32. La fixation de l’élément de jonction angulaire 98 et des pièces de jonction angulaire 34 à la deuxième paroi latérale de cuve 32 se réalise de façon similaire à la fixation de l’élément de jonction angulaire 98 avec le module de jonction angulaire 74 le plus proche. Un panneau de l’espace primaire 41 est collé et soudé au niveau de la liaison entre la deuxième paroi latérale de cuve 32 et l’élément de jonction angulaire 98 et la pluralité de pièces de jonction angulaire 34. The second section 106 of the angular junction element 98 and the second portion 58 of the angular junction pieces 74 are intended to be in contact with the second side wall of the tank 32. The fixing of the angular junction element 98 and the angular junction pieces 34 to the second side wall of the tank 32 is carried out in a manner similar to the fixing of the angular junction element 98 with the nearest angular junction module 74. A panel of the primary space 41 is glued and welded at the connection between the second vessel side wall 32 and the angular junction element 98 and the plurality of angular junction pieces 34.
La première paroi latérale de cuve 30, respectivement la deuxième paroi latérale de cuve 32, et la première paroi transversale de cuve 98 sont solidaires l’une de l’autre via un premier élément de jonction classique 130, respectivement un deuxième élément de jonction classique 132, réalisés de manière connue.
Le premier élément de jonction classique 130 et le deuxième élément de jonction classique 132 présentent chacun deux parties. Chacune des parties des éléments de jonction sont perpendiculaires l’une par rapport à l’autre, et chacune s’étend dans un plan d’extension principale d’une des parois de cuve décrite ci-dessus. L’élément de jonction angulaire 98 est ainsi en contact avec au moins l’une des extrémités d’au moins un élément de jonction classique 130. Dans l’exemple illustré, l’élément de jonction angulaire 98 est en contact d’une part avec le module de jonction angulaire 74 le plus proche, et d’autre part avec le premier élément de jonction classique 130 et avec le deuxième élément de jonction classique 132. Selon une variante de réalisation non illustrée, une cuve étanche selon l’invention peut être réalisée de sorte que la troisième paroi, ou première paroi transversale 96, perpendiculaire à la première paroi latérale 30 et à la deuxième paroi latérale 32, est liée à chacune de ces parois par un module de jonction angulaire 74. Dans ce contexte, l’élément de jonction angulaire 98 agencé à la jonction de ces trois parois est particulier en ce qu’une portion intermédiaire similaire à ce qui a été précédemment décrit est disposée entre des sections de l’élément de jonction angulaire agencées dans le prolongement de chacune des parois. L’élément de jonction angulaire étant ainsi adapté pour présenter à chaque jonction de deux parois une forme similaire à la première partie telle que décrite précédemment, il convient de noter que le renfort 78 prévu pour combler le dégagement entre l’élément de jonction angulaire et la structure porteuse interne 6 présente cette fois une forme pyramidale.
The first lateral vessel wall 30, respectively the second lateral vessel wall 32, and the first transverse vessel wall 98 are integral with one another via a first conventional junction element 130, respectively a second conventional junction element. 132, produced in a known manner. The first conventional junction element 130 and the second conventional junction element 132 each have two parts. Each of the parts of the junction elements are perpendicular to each other, and each extends in a main extension plane of one of the vessel walls described above. The angular junction element 98 is thus in contact with at least one of the ends of at least one conventional junction element 130. In the example illustrated, the angular junction element 98 is in contact on the one hand. with the closest angular junction module 74, and on the other hand with the first conventional junction element 130 and with the second conventional junction element 132. According to an alternative embodiment not illustrated, a sealed tank according to the invention can be made so that the third wall, or first transverse wall 96, perpendicular to the first side wall 30 and to the second side wall 32, is linked to each of these walls by an angular junction module 74. In this context, the The angular junction element 98 arranged at the junction of these three walls is particular in that an intermediate portion similar to what has been previously described is arranged between sections of the angular junction element arranged in s the extension of each of the walls. The angular junction element thus being adapted to present at each junction of two walls a shape similar to the first part as described above, it should be noted that the reinforcement 78 provided to fill the clearance between the angular junction element and the internal supporting structure 6 this time has a pyramidal shape.
Claims
1. Cuve étanche (26) et thermiquement isolante, apte à reposer sur une structure porteuse (6) d’un navire, la cuve étanche (26) comportant une pluralité de parois de cuve dont une première paroi de cuve (30) et au moins une deuxième paroi de cuve (32), la première paroi de cuve (30) s’étendant principalement dans un premier plan et la deuxième paroi de cuve (32) s’étendant principalement dans un deuxième plan, le premier plan et le deuxième plan étant perpendiculaires l’un par rapport à l’autre, la première paroi de cuve (30) et la deuxième paroi de cuve (32) étant liées par une pièce de jonction angulaire (34), caractérisé en ce que la pièce de jonction angulaire (34) présente une première portion (56) s’étendant principalement dans le premier plan, un deuxième portion (58) s’étendant principalement dans le deuxième plan et au moins une portion intermédiaire (60) s’étendant principalement dans un plan sécant au premier plan et au deuxième plan, la première portion (56) de la pièce de jonction angulaire (34) présentant une épaisseur équivalente à celle de la première paroi de cuve (30) et s’étendant dans le prolongement de cette première paroi de cuve (30) et la deuxième portion (58) de la pièce de jonction angulaire (34) présentant une épaisseur équivalente à celle de la deuxième paroi de cuve (32) et s’étendant dans le prolongement de cette deuxième paroi de cuve (32). 1. Leaktight tank (26) and thermally insulating, able to rest on a supporting structure (6) of a ship, the sealed tank (26) comprising a plurality of tank walls including a first tank wall (30) and least a second vessel wall (32), the first vessel wall (30) extending mainly in a first plane and the second vessel wall (32) extending mainly in a second plane, the first plane and the second plane being perpendicular to each other, the first vessel wall (30) and the second vessel wall (32) being linked by an angular junction piece (34), characterized in that the junction piece angular (34) has a first portion (56) extending mainly in the first plane, a second portion (58) extending mainly in the second plane and at least one intermediate portion (60) extending mainly in a plane secant in the foreground and in the second plane, the first portion (56) of the angular junction (34) having a thickness equivalent to that of the first tank wall (30) and extending in the extension of this first tank wall (30) and the second portion (58) of the angular junction piece ( 34) having a thickness equivalent to that of the second tank wall (32) and extending in the extension of this second tank wall (32).
2. Cuve étanche (26) selon la revendication 1 , la cuve étanche (26) comportant au moins une troisième paroi de cuve (96) s’étendant principalement dans un troisième plan perpendiculaire au premier plan, au deuxième plan et au plan sécant, et présentant une zone de jonction avec la première paroi de cuve (30) et la deuxième paroi de cuve (32), dans laquelle la zone de jonction comprend un élément de jonction angulaire (98), l’élément de jonction angulaire (98) comportant une première partie (100) et une deuxième partie (102), la première partie (100) présentant une première section (104) s’étendant principalement dans le premier plan, une deuxième section (106) s’étendant principalement dans le deuxième plan et une section intermédiaire (108) s’étendant principalement dans le plan sécant, la deuxième partie (102) présentant une paroi de renvoi (121) perpendiculaire à la première partie (100) et s’étendant principalement dans le troisième plan. 2. Leaktight tank (26) according to claim 1, the sealed tank (26) comprising at least one third tank wall (96) extending mainly in a third plane perpendicular to the first plane, to the second plane and to the secant plane, and having a junction area with the first vessel wall (30) and the second vessel wall (32), wherein the junction area comprises an angular junction element (98), the angular junction element (98) comprising a first part (100) and a second part (102), the first part (100) having a first section (104) extending mainly in the first plane, a second section (106) extending mainly in the second plane and an intermediate section (108) extending mainly in the secant plane, the second part (102) having a deflection wall (121) perpendicular to the first part (100) and extending mainly in the third plane.
3. Cuve étanche (26) selon la revendication 1 ou 2, dans laquelle la pièce de
jonction angulaire (34) et/ou l’élément de jonction angulaire (98) présentent chacun une face interne (27) et une face externe (29), la face interne (27) formant un chanfrein interne au niveau de la portion intermédiaire (60) ou au niveau de la section intermédiaire (108) et la face externe (29) formant un chanfrein externe au niveau de la portion intermédiaire (60) ou au niveau de la section intermédiaire (108), le chanfrein interne et externe s’inclinant selon un angle compris entre 120° et 150° par rapport au premier plan et au deuxième plan. 3. sealed tank (26) according to claim 1 or 2, wherein the part of angular junction (34) and / or the angular junction element (98) each have an internal face (27) and an external face (29), the internal face (27) forming an internal chamfer at the level of the intermediate portion ( 60) or at the level of the intermediate section (108) and the external face (29) forming an external chamfer at the level of the intermediate portion (60) or at the level of the intermediate section (108), the internal and external chamfer s' tilting at an angle between 120 ° and 150 ° with respect to the foreground and the second plane.
4. Cuve étanche (26) selon la revendication 3, dans laquelle la dimension de la portion intermédiaire (60) de la pièce de jonction angulaire (34) mesurée entre la première portion (56) et la deuxième portion (58) de ladite pièce (34), et/ou la dimension de la section intermédiaire (108) de l’élément de jonction angulaire (98) mesurée entre la première section (104) et la deuxième section (106) dudit élément de jonction angulaire (98), s’agrandit en allant de la face interne (27) vers la face externe (29). 4. sealed vessel (26) according to claim 3, wherein the dimension of the intermediate portion (60) of the angular junction piece (34) measured between the first portion (56) and the second portion (58) of said piece. (34), and / or the dimension of the intermediate section (108) of the angular junction element (98) measured between the first section (104) and the second section (106) of said angular junction element (98), grows from the inner face (27) to the outer face (29).
5. Cuve étanche (26) selon l’une quelconque des revendications précédentes, dans laquelle la pièce de jonction angulaire (34) et/ou l’élément de jonction angulaire (98) comportent successivement dans le sens de l’épaisseur depuis l’extérieur vers l’intérieur de la cuve, une barrière thermiquement isolante secondaire (36) apte à être au contact de la structure porteuse (6), une membrane d’étanchéité secondaire (38) portée par la barrière thermiquement isolante secondaire (36), une barrière thermiquement isolante primaire (40) reposant contre la membrane d’étanchéité secondaire (38) et une membrane d’étanchéité primaire (42) portée par la barrière thermiquement isolante primaire (40) et destinée à être en contact avec le fluide contenu dans la cuve étanche (26). 5. Leakproof vessel (26) according to any one of the preceding claims, wherein the angular junction piece (34) and / or the angular junction element (98) successively comprise in the direction of the thickness from the outside towards the inside of the tank, a secondary thermally insulating barrier (36) capable of being in contact with the supporting structure (6), a secondary waterproofing membrane (38) carried by the secondary thermally insulating barrier (36), a primary thermally insulating barrier (40) resting against the secondary waterproofing membrane (38) and a primary waterproofing membrane (42) carried by the primary thermally insulating barrier (40) and intended to be in contact with the fluid contained in the sealed tank (26).
6. Cuve étanche (26) selon la revendication 5, dans laquelle la barrière thermiquement isolante secondaire (36) et la membrane d’étanchéité secondaire (38) de la pièce de jonction angulaire (34) et/ou l’élément de jonction angulaire (98) présentent, selon une direction donnée, une plus grande dimension que la dimension correspondante, selon la même direction, de la barrière thermiquement isolante primaire (40) et de la membrane d’étanchéité primaire (42). 6. Sealed tank (26) according to claim 5, wherein the secondary thermally insulating barrier (36) and the secondary sealing membrane (38) of the angular junction piece (34) and / or the angular junction element (98) have, in a given direction, a larger dimension than the corresponding dimension, in the same direction, of the primary thermally insulating barrier (40) and of the primary waterproofing membrane (42).
7. Cuve étanche (26) selon l’une des revendications précédentes, dans
laquelle la dimension (D56, D58) de la première portion (56) et/ou de la deuxième portion (58) de la pièce de jonction angulaire (34) présente une valeur équivalente à celle de la dimension (D60) de la portion intermédiaire (60). 7. sealed tank (26) according to one of the preceding claims, in in which the dimension (D56, D58) of the first portion (56) and / or of the second portion (58) of the angular junction piece (34) has a value equivalent to that of the dimension (D60) of the intermediate portion (60).
8. Navire (200) comprenant au moins une cuve étanche (26) selon l’une quelconque des revendications précédentes. 8. Vessel (200) comprising at least one sealed tank (26) according to any one of the preceding claims.
9. Navire selon la revendication 8, comportant une coque externe (4) et une structure porteuse (6), la structure porteuse (6) étant destinée à loger la cuve étanche (26), la structure porteuse (6) présentant une première paroi de portée (18) s’étendant principalement le long du premier plan et une deuxième paroi de portée (20) s’étendant principalement le long du deuxième plan, la première paroi de portée (18) et la deuxième paroi de portée (20) étant sensiblement perpendiculaires, caractérisé en ce qu’une zone de dégagement est ménagée entre les parois de portée de la structure porteuse dans la zone de jonction (24) et la portion intermédiaire (60) de la pièce de jonction angulaire (34) et en ce qu’un élément de renfort (78) est logé dans ladite zone de dégagement. 9. Ship according to claim 8, comprising an outer hull (4) and a supporting structure (6), the supporting structure (6) being intended to house the sealed tank (26), the supporting structure (6) having a first wall. bearing wall (18) extending mainly along the first plane and a second bearing wall (20) extending mainly along the second plane, the first bearing wall (18) and the second bearing wall (20) being substantially perpendicular, characterized in that a clearance zone is provided between the bearing walls of the supporting structure in the junction zone (24) and the intermediate portion (60) of the angular junction piece (34) and in that a reinforcing element (78) is housed in said clearance zone.
10. Navire selon la revendication 9, dans lequel l’élément de renfort (78) est de section de forme triangulaire, l’élément de renfort (78) présentant un sommet (82) dont l’angle est équivalent à l’angle droit formé entre la première paroi de portée (18) et la deuxième paroi de portée (20), l’élément de renfort présentant une face de contact (80) avec la portion intermédiaire (60) qui est opposée à ce sommet. 10. Vessel according to claim 9, wherein the reinforcing element (78) is of triangular shaped section, the reinforcing element (78) having a vertex (82) whose angle is equivalent to the right angle. formed between the first bearing wall (18) and the second bearing wall (20), the reinforcing element having a contact face (80) with the intermediate portion (60) which is opposite this apex.
11. Navire selon la revendication 10, dans lequel la face de contact (80) présente un profil à facettes, en étant formée d’une pluralité de surfaces planes inclinées les unes par rapport aux autres de manière à tendre vers un profil incurvé vers l’intérieur de l’élément de renfort (78). 11. A vessel according to claim 10, wherein the contact face (80) has a faceted profile, being formed of a plurality of flat surfaces inclined with respect to each other so as to tend towards a profile curved towards the sea. 'interior of the reinforcing element (78).
12. Navire selon la revendication 10, dans lequel la face de contact (80) présente un profil incurvé de manière à générer une forme générale concave de l’élément de renfort (78). 12. A vessel according to claim 10, wherein the contact face (80) has a curved profile so as to generate a generally concave shape of the reinforcing element (78).
13. Navire selon l’une des revendications 9 à 12, la coque externe (4) présentant une pluralité de raidisseurs (8, 10) en contact avec la structure porteuse (6), dans lequel la concentration de raidisseurs (8, 10) est réduite à proximité de la
pièce de jonction angulaire (34) et/ou à proximité de l’élément de jonction angulaire (98). 13. Ship according to one of claims 9 to 12, the outer shell (4) having a plurality of stiffeners (8, 10) in contact with the supporting structure (6), wherein the concentration of stiffeners (8, 10) is reduced near the angular junction piece (34) and / or near the angular junction element (98).
14. Navire selon la revendication précédente, dans lequel une dimension (D60) de la portion intermédiaire (60) de la pièce de jonction angulaire (34) est déterminée en fonction de la position du raidisseur (84, 90) le plus proche d’un coin de la structure porteuse (6) dans lequel est positionnée la pièce de jonction angulaire (34). 14. Ship according to the preceding claim, wherein a dimension (D60) of the intermediate portion (60) of the angular junction piece (34) is determined as a function of the position of the stiffener (84, 90) closest to a corner of the supporting structure (6) in which the angular junction piece (34) is positioned.
15. Procédé de chargement ou de déchargement d’un gaz naturel liquide d’une cuve (26) selon les revendications 1 à 7 ou d’un navire (200) de gaz naturel liquide selon l’une des revendications 8 à 14.
15. A method of loading or unloading a liquid natural gas from a tank (26) according to claims 1 to 7 or from a vessel (200) of liquid natural gas according to one of claims 8 to 14.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1912011A FR3102532B1 (en) | 2019-10-25 | 2019-10-25 | Natural gas tank in liquid state of a ship |
PCT/EP2020/079964 WO2021078981A1 (en) | 2019-10-25 | 2020-10-23 | Tank for storing natural gas in a liquid state aboard a vessel |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4048935A1 true EP4048935A1 (en) | 2022-08-31 |
Family
ID=69810990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20793001.7A Pending EP4048935A1 (en) | 2019-10-25 | 2020-10-23 | Tank for storing natural gas in a liquid state aboard a vessel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4048935A1 (en) |
KR (1) | KR20220087469A (en) |
CN (1) | CN114599912B (en) |
FR (1) | FR3102532B1 (en) |
WO (1) | WO2021078981A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3929247A (en) * | 1973-07-11 | 1975-12-30 | Kaiser Aluminium Chem Corp | Cryogenic tank |
US4117947A (en) * | 1977-08-01 | 1978-10-03 | Frigitemp Corporation | Internal insulation for liquefied gas tank |
KR20010010152A (en) * | 1999-07-16 | 2001-02-05 | 한갑수 | Improved structure of a corner piece membrane unit for LNG storage tanks |
FR2813111B1 (en) * | 2000-08-18 | 2002-11-29 | Gaz Transport & Technigaz | WATERPROOF AND THERMALLY INSULATING TANK IMPROVED LONGITUDINAL AREAS |
KR101368763B1 (en) * | 2012-02-10 | 2014-03-03 | 삼성중공업 주식회사 | Insulation structure of cargo tank for lng |
FR3009745B1 (en) * | 2013-08-15 | 2016-01-29 | Gaztransp Et Technigaz | SEALED AND THERMALLY INSULATING TANK WITH ANGLE PIECE |
US10557592B2 (en) * | 2014-08-06 | 2020-02-11 | Kc Lng Tech Co., Ltd. | Corner structure of LNG storage tank |
KR102387173B1 (en) * | 2015-08-21 | 2022-04-15 | 대우조선해양 주식회사 | Insulation structure of 90 degree corner in liquefied gas cargo tank, and cargo tank having the insulation structure |
KR101884895B1 (en) * | 2017-07-13 | 2018-08-02 | 삼성중공업 주식회사 | Fixing apparatus for cargo corner barrier |
FR3072759B1 (en) * | 2017-10-20 | 2021-04-30 | Gaztransport Et Technigaz | WATERPROOF AND THERMALLY INSULATED TANK |
-
2019
- 2019-10-25 FR FR1912011A patent/FR3102532B1/en active Active
-
2020
- 2020-10-23 KR KR1020227015838A patent/KR20220087469A/en unknown
- 2020-10-23 WO PCT/EP2020/079964 patent/WO2021078981A1/en unknown
- 2020-10-23 CN CN202080074762.XA patent/CN114599912B/en active Active
- 2020-10-23 EP EP20793001.7A patent/EP4048935A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2021078981A1 (en) | 2021-04-29 |
FR3102532B1 (en) | 2023-12-08 |
CN114599912A (en) | 2022-06-07 |
KR20220087469A (en) | 2022-06-24 |
FR3102532A1 (en) | 2021-04-30 |
CN114599912B (en) | 2024-04-30 |
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