EP0214007A1 - Thermally insulated impervious container, and ship carrying it - Google Patents

Thermally insulated impervious container, and ship carrying it Download PDF

Info

Publication number
EP0214007A1
EP0214007A1 EP86401673A EP86401673A EP0214007A1 EP 0214007 A1 EP0214007 A1 EP 0214007A1 EP 86401673 A EP86401673 A EP 86401673A EP 86401673 A EP86401673 A EP 86401673A EP 0214007 A1 EP0214007 A1 EP 0214007A1
Authority
EP
European Patent Office
Prior art keywords
boxes
tank
barrier
particulate
tank according
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.)
Granted
Application number
EP86401673A
Other languages
German (de)
French (fr)
Other versions
EP0214007B1 (en
Inventor
Pierre Jean
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GAZ-TRANSPORT
Gaz Transport SARL
Original Assignee
GAZ-TRANSPORT
Gaz Transport SARL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GAZ-TRANSPORT, Gaz Transport SARL filed Critical GAZ-TRANSPORT
Publication of EP0214007A1 publication Critical patent/EP0214007A1/en
Application granted granted Critical
Publication of EP0214007B1 publication Critical patent/EP0214007B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
    • 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
    • F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
    • 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 a sealed and thermally insulating tank intended for the storage of a liquefied gas at low temperature.
  • a sealed and thermally insulating tank intended for the storage of a liquefied gas at low temperature.
  • Such a tank can be integrated into the carrying structure of a liquefied gas carrier ship or constitute a terrestrial storage tank.
  • a terrestrial storage tank has in particular been described in French patent No. 2,398,961; a tank integrated into the carrying structure of a ship has, for example, been described in French patents No. 2,264,712 and 2,527,544.
  • the tanks of this type consist of two successive sealing barriers, one primary in contact with the liquefied gas and the other secondary disposed between the primary barrier and the external partition of the tank; these two sealing barriers are alternated with two thermally insulating barriers;
  • the sealing barriers defined in the above-mentioned prior art consist of invar sheets welded with raised edges; the insulation barriers are formed by means of boxes containing a particulate thermal insulator such as expanded perlite.
  • the object of the present invention is to propose an improvement which makes it possible to reduce the heat losses of the storage tanks having the structure mentioned above. It is known, in fact, that, when the volume V of the secondary insulating barrier is placed under reduced pressure, the reduction in heat losses comes essentially from a reduction relating to losses by convection. It follows that the part of the losses, which is due to radiation, takes on a much greater relative importance than in the case where the pressure in the volume V is equal to atmospheric pressure. According to the invention, it has been imagined to place inside the volume V radiation reflecting elements, which considerably reduce the value of these losses and therefore act significantly on the overall level of heat losses. It has been found that the installation of such radiation reflecting elements in the volume V makes it possible to reduce by 30% the thermal losses observed in the absence of these radiation reflecting elements.
  • the present invention therefore relates to the new industrial product which constitutes a sealed and thermally insulating tank intended for the storage of a liquefied gas at low temperature and consisting of at least one sealing barrier and at least one insulating barrier of volume V between the external partition of the tank and said sealing barrier, said volume V being at an absolute pressure of between 0.1 and 300 mbar, characterized in that the volume V contains reflective elements of radiation, at least some of the radiation reflecting elements being arranged in substantially planar surfaces, and a secondary insulation barrier is formed by means of boxes containing a particulate thermal insulator, the substantially planar radiation reflecting elements covering at least one part of the flat surfaces presented internally by the boxes of the secondary insulation barrier.
  • this tank consists of two successive sealing barriers, one primary in contact with the liquefied gas and the other secondary disposed between the primary barrier and the external partition of the tank, the volume V being between the external partition of the tank and the secondary sealing barrier.
  • At least some radiation reflecting elements can be made in the form of particulate material.
  • Insulation barrier boxes secondary are substantially parallelepiped and at least some of the radiation reflecting elements internally cover the large faces of said boxes; the boxes of the secondary insulating barrier have interior partitions and at least some of the radiation reflecting elements cover the walls of said interior partitioning.
  • At least some of the radiation reflecting elements are arranged between, on the one hand, the boxes of the secondary insulating barrier and, on the other hand, the external partition of the tank .
  • the secondary insulation barrier is constituted by means of boxes containing a particulate thermal insulator and the radiation reflecting elements in particulate form are mixed with the particulate thermal insulator contained in said boxes a bonding material can be mixed with the particulate thermal insulator and the radiation reflecting elements in particulate form in order to maintain over time the homogeneity of the mixture of the two particulate materials and to avoid segregation of the mixture; the bonding material may be a material with adhesive property distributed in the mixture of particulate materials, which forms the filling of the boxes of the secondary insulating barrier.
  • particulate material constituting radiation reflecting elements aluminum powder; in this case, if the particulate material constituting the thermal insulator is expanded perlite, it can be seen that, over time, there is only a very slight tendency to segregate the mixture since the bulk densities of the two particulate materials are substantially similar. It will therefore be sought, in order to promote the maintenance of the homogeneity of the mixture of the particulate materials, to ensure that the apparent densities of the two mixed materials, namely the insulator and the reflector, are as close as possible.
  • the mixture of particulate materials which forms the filling of the boxes of the secondary insulating barrier, contains from 1 to 25% by weight of particulate material constituting the radiation reflecting elements; in the case where expanded perlite and aluminum powder are used, the preferred proportion is close to 10% by weight of aluminum powder relative to the total weight of the mixture of particulate materials.
  • the tank according to the invention can advantageously be used for a ship carrying liquefied gas; in this case, the external partition of the tank is constituted by the double hull of the ship.
  • These tanks can advantageously have the structure defined in French Patent No. 2,527,544 which is incorporated in the present description by way of reference; in this case, the primary and secondary sealing barriers are formed by means of metal strakes with edges raised towards the inside of the tank, said strakes being made of thin sheets with low coefficient of expansion and being welded edge to edge, by their raised edges, on both sides of a weld wing, which is mechanically retained on the elements of the underlying insulating barrier, the secondary insulating barrier being constituted by a set of substantially parallelepipedic boxes fixed against the double hull of the ship by retaining members integral with said double shell, each retaining member cooperating with fastening means arranged on the edge of said boxes of the secondary insulating barrier, said elements being separated from each other by substantially rectilinear joint zones, where are located the aforementioned
  • the secondary insulation barrier may consist of two superimposed layers of boxes, the first layer being disposed just below the secondary sealing barrier while the second layer is disposed between the first layer and the double hull of the ship, the boxes of each of the two layers of the secondary insulation barrier internally comprising, to form the internal partitioning, load-bearing spacers all parallel to one another, the orientations of the load-bearing spacers of the boxes of the two layers forming between them an angle close to 90 °.
  • the boxes of the two layers of the secondary insulation barrier may also internally contain non-load-bearing spacers arranged perpendicular to the load-bearing spacers.
  • the present invention also relates to the new industrial product that constitutes a ship transporting liquefied gas at low temperature, in particular liquefied natural gas with a high methane content, characterized in that it comprises at least one tank as shown below. above defined.
  • An LNG carrier ship as described in French Patent No. 2,527,544, comprises tanks whose external wall 1 is constituted by the double hull of the ship.
  • this wall plywood slats which rest on strands of polymerizable resin and the positioning of these slats 2 is adjusted so that they define, in a discontinuous manner, a theoretical surface independent of the more or less good conformation of the wall 1.
  • each element consists of a rectangular plywood box of 1.2 meters by 1 meter and internally has supporting struts 4, which are all parallel to the long side of the box.
  • the spacers 4 are interposed between the two large faces of the box, one of these large faces resting on the slats 2.
  • non-load-bearing spacers 5 have been put in place, which are only intended to ensure the relative positioning of the spacers 4.
  • the non-supporting spacers 5 are made of plastic foam; each tank 3 is 25 cm thick and has five load-bearing spacers 4 and three non-load-bearing spacers 5.
  • fastening means 7 cooperate with retaining members made up of studs 8 welded to the load-bearing structure 1 of the ship, these studs 8 comprising a threaded end with which cooperates a nut which rests on a square plate.
  • retaining members made up of studs 8 welded to the load-bearing structure 1 of the ship, these studs 8 comprising a threaded end with which cooperates a nut which rests on a square plate.
  • the boxes 3 are in abutment against one another along their faces perpendicular to the alignment of studs 8, but, in the perpendicular direction, the boxes 3 are spaced by a joint zone where the battens 7 and the members of detention. After all the retaining members have been screwed on, the joint zones are blocked by the plastic shims 9, these shims having longitudinal slots, which allow their insertion with elastic clamping in the joint zones.
  • the parts of the joint zones which are not filled by the shims 9 can be filled with glass wool.
  • the secondary insulation barrier comprises, above this second layer, which has just been described, a first layer consisting of boxes each designated by the reference 10 as a whole.
  • the set of boxes 10 rests directly on the set of boxes 3.
  • Each box 10 consists of a parallelepiped box made of plywood; these boxes have a thickness of 20 cm and large faces, which have identically the same dimensions than those of the large faces of the boxes 3.
  • each box 10 there are, parallel to the short sides, seven equidistant carrier spacers 11 and parallel to the long sides, three non-carrier spacers 12.
  • the carrier spacers 11 are plywood plates inserted between the two large faces of the box 10.
  • the non-supporting spacers 12 are made of plastic foam and have the same role as the spacers 5 previously described.
  • the retaining members of this first layer of the secondary insulating barrier are constituted by rods 15, whose base is screwed into a sleeve 8 is welded to the bearing structure 1 of the vessel.
  • plastic shims are inserted which have longitudinal slots so that they can be inserted by elastic compression in the joint zones and then be held there by elastic blocking.
  • These shims have longitudinal grooves having the same role as the grooves of the shims 9.
  • the parts of the joint zones of this first layer, that they are not occupied by the shims of insulating plastic material, can advantageously be stuffed with wool of glass to improve insulation.
  • the secondary sealing barrier which is constituted by invar strakes 16 with raised edges is put in place.
  • These strakes 16 are arranged between two welding wings 14 consecutive: they are 50 cm wide; the welds are made on either side of the wings 14 continuously to ensure sealing.
  • the wings 14 retain the secondary sealing barrier on the caissons 10.
  • the bearing surface of the secondary sealing barrier is continuous even at the level of the joint areas between the caissons 10 due to the presence of shims in particular.
  • the primary insulation barrier is constituted by means of boxes 17 which are held in position by anchoring members fixed in bases 18 connected to the sockets 8 a .
  • Each box 17 is a rectangular parallelepiped box made of plywood; the thickness of the box is 20 cm and the dimensions of the large faces are identical to those of the boxes 3 and 10.
  • the large face of the box 17, which is located towards the inside of the tank, carries grooves 19 formed in the thickness of the wall and parallel to the grooves 13. These grooves 19 have a cross section in T; they are used for positioning welding wings 20 identical to the wings 14.
  • the large face of the box 17, which is opposite to that which carries the grooves 19, also carries grooves made in line with and in a load-bearing spacer: these grooves are intended to house the welding wings 14 and the raised edges of the strakes 16 associated with them.
  • the large faces of the boxes 17, which carry the grooves 19, have, thanks to known means which are described in particular in French Patent No. 2,527,544, a continuous surface on which the primary sealing barrier can bear. of the tank.
  • This primary sealing barrier is produced by invar strakes 21 which are identical to strakes 16 previously described. The strakes 21 are welded with raised edges and on the other side of the weld wings 20 placed in the grooves 19.
  • the boxes 3, 10 and 17, which have been previously described in detail, are filled with a thermally insulating particulate material, such as for example expanded perlite.
  • the volume V which is between the external partition 1 of the tank and the secondary sealing barrier constituted by the strakes 16, is at an absolute pressure of between 0.1 and 300 mbar. It is in this volume that are arranged, according to the present invention, radiation reflecting elements.
  • some of such reflective elements 22 internally cover the large faces of the boxes or parallelepiped boxes 3, 10 of the secondary insulation barrier. Some of these radiation-reflecting elements may also cover the walls of the interior partitioning formed by the load-bearing 4 and non-load-bearing spacers 5. These radiation-reflecting elements can be placed in boxes of the first insulation layer and / or in boxes of the second layer of insulation.
  • These radiation reflecting elements 22 are made of a material having a high reflectivity, such as, for example, sheets of polished aluminum.
  • the radiation reflecting elements are particulate elements 23 which are mixed with the particulate thermal insulator 24 as shown in FIG. 3.
  • a bonding material can be mixed with the particulate thermal insulator 24 and the radiation reflecting elements 23 in particulate form to maintain, over time, the homogeneity of the mixture of the two particulate materials and thus avoid segregation of this mixture.
  • This bonding material can be a material with adhesive properties distributed in the mixture of particulate material which forms the filling of the boxes of the secondary insulating barrier.
  • the particulate material constituting the radiation reflecting elements 23 of the aluminum powder is advantageously used.
  • the particulate material constituting the thermal insulator is expanded perlite, it can be seen that over time there is only a very slight tendency to segregate the mixture since the apparent densities of the two particulate materials are substantially similar.
  • the mixture of particulate materials which forms the filling of the boxes of the secondary insulating barrier, preferably contains approximately 10% by weight of powder of aluminum relative to the total weight of the mixture of particulate materials.
  • the primary insulation barrier will be produced in the same way as the secondary insulation barrier: insulating boxes with reflective elements and aluminum powder, the volume of this insulation also being maintained under vacuum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

1. A leakproof and thermally insulating tank intended for the storage of a liquefied gas at a low temperature and constituted by at least one sealing barrier and at least one insulating barrier of volume V, comprised between the external wall of the tank and the said sealing barrier, the said volume V being at an absolute pressure comprised between 0,1 and 300 mbars and containing radiation reflector elements, characterized in that, in a per se known manner, the insulating barrier is constituted by means of compartments (3, 10) containing a particulate thermal insulating material (24), these compartments (3, 10) being substantially parallelepiped and containing internal partitions (4, 5, 11, 12) and in that the radiation reflector elements (22) comprise sheets covering the flat surfaces internally presented by the compartments (3, 10) and the walls of said internal partitions (4, 5, 11, 12).

Description

La présente invention a trait à une cuve étanche et thermiquement isolante destinée au stockage d'un gaz liqué­fié à basse température. Une telle cuve peut être intégrée à la structure porteuse d'un navire transporteur de gaz liquéfié ou constituer une cuve de stockage terrestre.The present invention relates to a sealed and thermally insulating tank intended for the storage of a liquefied gas at low temperature. Such a tank can be integrated into the carrying structure of a liquefied gas carrier ship or constitute a terrestrial storage tank.

On a déjà décrit des cuves étanches et isothermes destinées au stockage des gaz liquéfiés. Une cuve de stockage terrestre a notamment été décrite dans le brevet français n° 2 398 961 ; une cuve intégrée à la structure porteuse d'un navire a, par exemple, été décrite dans les brevets français n° 2 264 712 et n° 2 527 544 . Les cuves de ce type sont constituées par deux barrières d'étanchéité successives, l'une primaire au contact du gaz liquéfié et l'autre secondaire disposée entre la barrière primaire et la cloison externe de la cuve ; ces deux barrières d'étanchéité sont alternées avec deux barrières thermiquement isolantes ; les barrières d'étan­chéité définies dans l'état de la technique sus-mentionné sont constituées de tôles d'invar soudées à bords relevés ; les barrières d'isolation sont constituées au moyen de caisses contenant un isolant thermique particulaire tel que la perlite expansée.We have already described sealed and isothermal tanks intended for the storage of liquefied gases. A terrestrial storage tank has in particular been described in French patent No. 2,398,961; a tank integrated into the carrying structure of a ship has, for example, been described in French patents No. 2,264,712 and 2,527,544. The tanks of this type consist of two successive sealing barriers, one primary in contact with the liquefied gas and the other secondary disposed between the primary barrier and the external partition of the tank; these two sealing barriers are alternated with two thermally insulating barriers; the sealing barriers defined in the above-mentioned prior art consist of invar sheets welded with raised edges; the insulation barriers are formed by means of boxes containing a particulate thermal insulator such as expanded perlite.

Dans les cuves de ce type actuellement utilisées , l'isolation thermique est réalisée aussi bien que possible, mais il existe toujours des pertes thermiques qui entraînent la vaporisation du gaz liquéfié stocké. On a déjà proposé, dans le brevet français n° 2 535 831, d'améliorer l'isolation thermique des cuves de stockage de gaz liquéfié du type ci-­dessus défini en mettant sous pression réduite la barrière d'isolation secondaire, la pression à maintenir dans le vo­lume V occupé par ladite barrière étant comprise entre 0,1 et 300 mbars absolus. On a constaté que l'on obtenait ainsi des améliorations d'isolement thermique très importantes et que l'entretoisement interne des caisses de la barrière d'iso­lation thermique permettait à ces caisses de supporter sans dommage la compression due à la mise en dépression du volume V où est disposée la barrière d'isolation secondaire.In the tanks of this type currently used, thermal insulation is carried out as well as possible, but there are always thermal losses which entail the vaporization of the stored liquefied gas. It has already been proposed in French Patent No. 2,535,831 to improve the thermal insulation of liquefied gas storage tanks of the type defined above by putting the secondary insulation barrier, the pressure at keep in the volume V occupied by said barrier being between 0.1 and 300 mbar absolute. It has been found that very significant improvements in thermal insulation are thus obtained and that the internal bracing of the boxes of the thermal insulation barrier allows these boxes to withstand without damage the compression due to the depression of the volume V where the secondary insulation barrier is placed.

Néanmoins, subsistent dans les cuves de stockage perfectionnées du type ci-dessus défini des pertes thermiques, qui entraînent la vaporisation du gaz liquéfié stocké ; dans les cuves existantes ayant leurs barrières d'isolation secon­daire sous une pression de 5 mbars absolus, on constate une perte en poids de gaz liquéfié d'environ 0,25% pour un navire ayant une capacité de 75.000 m³ et un taux d'évaporation nomi­nal de 0,30% par jour de stockage. Il est évident que le coût d'une telle perte est encore élevé, même si, dans le cas des navires de transport de gaz, on utilise le gaz vaporisé pour la propulsion du navire.Nevertheless, there remain in the improved storage tanks of the type defined above, thermal losses, which cause the vaporization of the stored liquefied gas; in existing tanks with their secondary insulation barriers under a pressure of 5 mbar absolute, there is a loss in weight of liquefied gas of about 0.25% for a ship with a capacity of 75,000 m³ and an evaporation rate nominal 0.30% per day of storage. It is obvious that the cost of such a loss is still high, even if, in the case of gas transport ships, vaporized gas is used for the propulsion of the ship.

La présente invention a pour but de proposer un perfectionnement qui permet de réduire les pertes thermiques des cuves de stockage ayant la structure ci-dessus mentionnée. On sait, en effet, que, lorsque le volume V de la barrière isolante secondaire est mis sous pression réduite, la réduction des pertes thermiques provient essentiellement d'une réduction relative aux pertes par convection. Il en résulte que la partie des pertes,qui est due au rayonnement,prend une impor­tance relative beaucoup plus grande que dans le cas où la pression dans le volume V est égale à la pression atmosphé­rique. Selon l'invention, on a imaginé de mettre en place à l'intérieur du volume V des éléments réflecteurs de rayonne­ment, qui réduisent de façon considérable la valeur de ces pertes et agissent donc de façon importante sur le niveau global des pertes thermiques. On a constaté que la mise en place de tels éléments réflecteurs de rayonnement dans le volume V permettait de réduire de 30 % les pertes thermiques constatées en l'absence de ces éléments réflecteurs de rayonne­ment. Il convient cependant de noter que cette amélioration significative de l'isolation n'est importante que dans la mesure où le volume V de la barrière isolante secondaire est placée sous pression réduite car, dans le cas contraire, l'a­mélioration n'est pratiquement pas notable, compte tenu de l'importance des pertes par convection. En d'autres termes, la mise en place d'éléments réflecteurs de rayonnement ne fournit un résultat satisfaisant que dans la mesure où elle est combinée à la mise sous pression réduite du volume V.The object of the present invention is to propose an improvement which makes it possible to reduce the heat losses of the storage tanks having the structure mentioned above. It is known, in fact, that, when the volume V of the secondary insulating barrier is placed under reduced pressure, the reduction in heat losses comes essentially from a reduction relating to losses by convection. It follows that the part of the losses, which is due to radiation, takes on a much greater relative importance than in the case where the pressure in the volume V is equal to atmospheric pressure. According to the invention, it has been imagined to place inside the volume V radiation reflecting elements, which considerably reduce the value of these losses and therefore act significantly on the overall level of heat losses. It has been found that the installation of such radiation reflecting elements in the volume V makes it possible to reduce by 30% the thermal losses observed in the absence of these radiation reflecting elements. It should however be noted that this significant improvement in the insulation is only significant insofar as the volume V of the secondary insulating barrier is placed under reduced pressure because, otherwise, the improvement is practically not notable, given the importance of convection losses. In other words, the placement of radiation reflecting elements provides a satisfactory result only insofar as it is combined with the placing under reduced pressure of the volume V.

La présente invention a ,en conséquence, pour objet le produit industriel nouveau que constitue une cuve étanche et thermiquement isolante destinée au stockage d'un gaz liqué­fié à basse température et constituée d'au moins une barrière d'étanchéité et d'au moins une barrière isolante de volume V comprise entre la cloison externe de la cuve et ladite barriè­re d'étanchéité, ledit volume V étant à une pression absolue comprise entre 0,1 et 300 mbars, caractérisé par le fait que le volume V contient des éléments réflecteurs de rayonnement, au moins certains des éléments réflecteurs de rayonnement étant disposés selon des surfaces sensiblements planes, et qu'une barrière d'isolation secondaire est constituée au moyen de caisses contenant un isolant thermique particulaire, les éléments réflecteurs de rayonnement sensiblement plans recouvrant au moins une partie des surfaces planes présentées intérieurement par les caisses da la barrière d'isolation secondaire.The present invention therefore relates to the new industrial product which constitutes a sealed and thermally insulating tank intended for the storage of a liquefied gas at low temperature and consisting of at least one sealing barrier and at least one insulating barrier of volume V between the external partition of the tank and said sealing barrier, said volume V being at an absolute pressure of between 0.1 and 300 mbar, characterized in that the volume V contains reflective elements of radiation, at least some of the radiation reflecting elements being arranged in substantially planar surfaces, and a secondary insulation barrier is formed by means of boxes containing a particulate thermal insulator, the substantially planar radiation reflecting elements covering at least one part of the flat surfaces presented internally by the boxes of the secondary insulation barrier.

De préférence, cette cuve est constituée de deux barrières d'étanchéité successives, l'une primaire au contact avec le gaz liquéfié et l'autre secondaire disposée entre la barrière primaire et la cloison externe de la cuve, le volume V étant compris entre la cloison externe de la cuve et la barrière d'étanchéité secondaire.Preferably, this tank consists of two successive sealing barriers, one primary in contact with the liquefied gas and the other secondary disposed between the primary barrier and the external partition of the tank, the volume V being between the external partition of the tank and the secondary sealing barrier.

Au moins certains éléments réflecteurs de rayon­nement peuvent être réalisés sous forme de matériau particu­laire.At least some radiation reflecting elements can be made in the form of particulate material.

Les caisses de la barrière d'isolation secondaire sont sensiblement parallélépipédiques et au moins certains des éléments réflecteurs de rayonnement recouvrent intérieurement les grandes faces desdites caisses ; les caisses de la barrière isolante secondaire comportent des cloisonnements intérieurs et au moins certains des éléments réflecteurs de rayonnement recouvrent les parois dudit cloi­sonnement intérieur.Insulation barrier boxes secondary are substantially parallelepiped and at least some of the radiation reflecting elements internally cover the large faces of said boxes; the boxes of the secondary insulating barrier have interior partitions and at least some of the radiation reflecting elements cover the walls of said interior partitioning.

Dans un autre mode de réalisation pouvant être combiné avec le précédent, au moins certains des éléments réflecteurs de rayonnement sont disposés entre, d'une part, les caisses de la barrière isolante secondaire et, d'autre part, la cloison externe de la cuve.In another embodiment which can be combined with the previous one, at least some of the radiation reflecting elements are arranged between, on the one hand, the boxes of the secondary insulating barrier and, on the other hand, the external partition of the tank .

On peut avantageusement prévoir de réaliser les éléments réflecteurs de rayonnement selon cette première variante sous forme de feuilles d'aluminium poli.Advantageously, provision can be made to produce the radiation reflecting elements according to this first variant in the form of polished aluminum sheets.

Dans un mode préféré de réalisation de la deu­xième variante ci-dessus mentionnée, la barrière d'isolation secondaire est constituée au moyen de caisses contenant un isolant thermique particulaire et les éléments réflecteurs de rayonnement sous forme particulaire sont mélangés à l'isolant thermique particulaire contenu dans lesdites caisses un matériau de liaison peut être mélangé à l'isolant ther­mique particulaire et aux éléments réflecteurs de rayonne­ment sous forme particulaire pour maintenir au cours du temps l'homogénéité du mélange des deux matériaux particu­laires et éviter la ségrégation du mélange ; le matériau de liaison peut être un matériau à propriété adhésive répartie dans le mélange de matériaux particulaires,qui forme le remplis­sage des caisses de la barrière isolante secondaire.In a preferred embodiment of the second variant mentioned above, the secondary insulation barrier is constituted by means of boxes containing a particulate thermal insulator and the radiation reflecting elements in particulate form are mixed with the particulate thermal insulator contained in said boxes a bonding material can be mixed with the particulate thermal insulator and the radiation reflecting elements in particulate form in order to maintain over time the homogeneity of the mixture of the two particulate materials and to avoid segregation of the mixture; the bonding material may be a material with adhesive property distributed in the mixture of particulate materials, which forms the filling of the boxes of the secondary insulating barrier.

On peut avantageusement utiliser comme matériau particulaire constituant des éléments réflecteurs de rayonne­ment, de la poudre d'aluminium ; dans ce cas, si le matériau particulaire constituant l'isolant thermique est de la perlite expansée, on constate qu'au cours du temps, il n'y a qu'une très faible tendance à la ségrégation du mélange étant donné que les densités apparentes des deux matériaux particulaires sont sensiblement voisines. On cherchera donc, pour favoriser le maintien de l'homogénéité du mélange des matériaux particulai­res, à faire en sorte que les densités apparentes des deux matériaux mélangés, à savoir l'isolant et le réflecteur, soient aussi voisines que possible. On préfère que le mélange de ma­tériaux particulaires, qui forme le remplissage des caisses de la barrière isolante secondaire, contienne de 1 à 25 % en poids de matériau particulaire constituant les éléments ré­flecteurs de rayonnement ; dans le cas où on utilise de la perlite expansée et de la poudre d'aluminium, la proportion préférée est voisine de 10 % en poids de poudre d'aluminium par rapport au poids total du mélange de matériaux particulaires.One can advantageously use as particulate material constituting radiation reflecting elements, aluminum powder; in this case, if the particulate material constituting the thermal insulator is expanded perlite, it can be seen that, over time, there is only a very slight tendency to segregate the mixture since the bulk densities of the two particulate materials are substantially similar. It will therefore be sought, in order to promote the maintenance of the homogeneity of the mixture of the particulate materials, to ensure that the apparent densities of the two mixed materials, namely the insulator and the reflector, are as close as possible. It is preferred that the mixture of particulate materials, which forms the filling of the boxes of the secondary insulating barrier, contains from 1 to 25% by weight of particulate material constituting the radiation reflecting elements; in the case where expanded perlite and aluminum powder are used, the preferred proportion is close to 10% by weight of aluminum powder relative to the total weight of the mixture of particulate materials.

La cuve selon l'invention peut avantageusement être utilisée pour un navire transporteur de gaz liquéfié ; dans ce cas, la cloison externe de la cuve est constituée par la double coque du navire. Ces cuves peuvent avantageusement avoir la structure définie dans le brevet français n° 2 527 544 qui est incorporé dans la présente description à titre de réfé­rence ; dans ce cas, les barrières d'étanchéité primaire et secondaire sont formées au moyen de virures métalliques à bords relevés vers l'intérieur de la cuve, lesdites virures étant constituées de tôles minces à faible coefficient de dilatation et étant soudées bord à bord, par leurs bords relevés, sur les deux faces d'une aile de soudure, qui est retenue mécani­quement sur les éléments de la barrière isolante sousjacente, la barrière isolante secondaire étant constituée par un ensem­ble de caisses sensiblement parallélépipédiques fixé contre la double coque du navire par des organes de retenue solidaires de ladite double coque, chaque organe de retenue coopérant avec des moyens de fixation disposés en bordure desdites caisses de la barrière isolante secondaire, lesdits éléments étant séparés les uns des autres par des zones de joint sensi­blement rectilignes, où se trouvent disposés les moyens de fixation précités, la barrière isolante primaire étant consti­ tuée par un ensemble d'éléments calorifuges maintenu en appui sur la barrière d'étanchéité secondaire grâce à des organes d'ancrage fixés sur la double coque du navire, lesdits organes d'ancrage traversant la barrière d'étanchéité secondaire, l'étanchéité de ladite barrière d'étanchéité secondaire étant maintenue grâce à des soudures, qui relient lesdits organes d'ancrage aux virures de la barrière d'étanchéité secondaire. En outre, on peut prévoir que la barrière d'isolation secon­daire soit constituée de deux couches superposées de caisses, la première couche étant disposée juste au-dessous de la bar­rière d'étanchéité secondaire alors que la deuxième couche est disposée entre la première couche et la double coque du navire, les caisses de chacune des deux couches de la barrière d'isolation secondaire comportant intérieurement, pour former le cloisonnement interne, des entretoises porteuses toutes parallèles entre elles, les orientations des entretoises porteu­ses des caissons des deux couches formant entre elles un angle voisin de 90°. Les caisses des deux couches de la barrière d'isola­tion secondaire peuvent également comporter intérieurement des entretoises non porteuses disposées perpendiculairement aux entretoises porteuses.The tank according to the invention can advantageously be used for a ship carrying liquefied gas; in this case, the external partition of the tank is constituted by the double hull of the ship. These tanks can advantageously have the structure defined in French Patent No. 2,527,544 which is incorporated in the present description by way of reference; in this case, the primary and secondary sealing barriers are formed by means of metal strakes with edges raised towards the inside of the tank, said strakes being made of thin sheets with low coefficient of expansion and being welded edge to edge, by their raised edges, on both sides of a weld wing, which is mechanically retained on the elements of the underlying insulating barrier, the secondary insulating barrier being constituted by a set of substantially parallelepipedic boxes fixed against the double hull of the ship by retaining members integral with said double shell, each retaining member cooperating with fastening means arranged on the edge of said boxes of the secondary insulating barrier, said elements being separated from each other by substantially rectilinear joint zones, where are located the aforementioned fixing means, the primary insulating barrier being constituted killed by a set of heat-insulating elements maintained in abutment on the secondary sealing barrier by means of anchoring members fixed on the double hull of the ship, said anchoring members crossing the secondary sealing barrier, the sealing of said secondary sealing barrier being maintained by means of welds, which connect said anchoring members to the strakes of the secondary sealing barrier. In addition, provision may be made for the secondary insulation barrier to consist of two superimposed layers of boxes, the first layer being disposed just below the secondary sealing barrier while the second layer is disposed between the first layer and the double hull of the ship, the boxes of each of the two layers of the secondary insulation barrier internally comprising, to form the internal partitioning, load-bearing spacers all parallel to one another, the orientations of the load-bearing spacers of the boxes of the two layers forming between them an angle close to 90 °. The boxes of the two layers of the secondary insulation barrier may also internally contain non-load-bearing spacers arranged perpendicular to the load-bearing spacers.

La présente invention a également pour objet le produit industriel nouveau que constitue un navire transpor­teur de gaz liquéfié à basse température, notamment de gaz naturel liquéfié à forte teneur en méthane, caractérisé par le fait qu'il comporte au moins une cuve telle que ci-dessus définie.The present invention also relates to the new industrial product that constitutes a ship transporting liquefied gas at low temperature, in particular liquefied natural gas with a high methane content, characterized in that it comprises at least one tank as shown below. above defined.

Pour mieux faire comprendre l'objet de l'invention, on va en décrire maintenant à titre d'exemple purement illus­tratif et non limitatif, un mode de réalisation représenté sur le dessin annexé.To better understand the object of the invention, there will now be described by way of purely illustrative and nonlimiting example, an embodiment shown in the accompanying drawing.

Sur ce dessin :

  • - la figure 1 représente, en perspective éclatée, les barrières d'étanchéité et d'isolation d'une cuve de navire méthanier réalisée comme indiqué dans le brevet français n° 2 527 544 ;
  • - la figure 2 représente schématiquement la mise en place d'éléments réflecteurs de rayonnement plans à l'in­térieur d'une caisse constitutive de la barrière d'isolation secondaire ;
  • - la figure 3 représente schématiquement la mise en place d'un matériau particulaire formant des éléments réflecteurs de rayonnement à l'intérieur d'une caisse consti­tutive de la barrière d'isolation secondaire.
On this drawing :
  • - Figure 1 shows, in exploded perspective, the sealing and insulation barriers of an LNG tank made as indicated in the French patent 2,527,544;
  • - Figure 2 schematically shows the establishment of planar radiation reflecting elements inside a box constituting the secondary insulation barrier;
  • - Figure 3 schematically shows the establishment of a particulate material forming radiation reflecting elements inside a body constituting the secondary insulation barrier.

Un navire méthanier, tel que décrit dans le brevet français n° 2 527 544, comprend des cuves dont la paroi externe 1 est constituée par la double coque du navire. De façon connue, on dispose sur cette paroi des lattes de contreplaqué qui reposent sur des boudins de résine polymé­risable et l'on règle le positionnement de ces lattes 2 de telle sorte qu'elles définissent, de façon discontinue, une surface théorique indépendante de la plus ou moins bonne conformation de la paroi 1.An LNG carrier ship, as described in French Patent No. 2,527,544, comprises tanks whose external wall 1 is constituted by the double hull of the ship. In known manner, there are on this wall plywood slats which rest on strands of polymerizable resin and the positioning of these slats 2 is adjusted so that they define, in a discontinuous manner, a theoretical surface independent of the more or less good conformation of the wall 1.

Sur les lattes 2, on met en place les éléments de la deuxième couche de la barrière d'isolation secondaire : ces éléments sont désignés dans leur ensemble par la réfé­rence 3 ; chaque élément est constitué d'un caisson parallé­lépipédique en bois contreplaqué de 1,2 mètre sur 1 mètre et comporte intérieurement des entretoises porteuses 4, qui sont toutes parallèles au grand côté du caisson. Les entretoises 4 sont interposées entre les deux grandes faces du caisson, l'une de ces grandes faces reposant sur les lattes 2. Entre les entretoises porteuses 4, on a mis en place des entretoises non porteuses 5, qui sont uniquement destinées à assurer le positionnement relatif des entretoises 4. Les entretoises non porteuses 5 sont réalisées en mousse plastique ; chaque cai­son 3 a une épaisseur de 25 cm et comporte cinq entretoises porteuses 4 et trois entretoises non porteuses 5.On the slats 2, the elements of the second layer of the secondary insulation barrier are put in place: these elements are designated as a whole by the reference 3; each element consists of a rectangular plywood box of 1.2 meters by 1 meter and internally has supporting struts 4, which are all parallel to the long side of the box. The spacers 4 are interposed between the two large faces of the box, one of these large faces resting on the slats 2. Between the load-bearing spacers 4, non-load-bearing spacers 5 have been put in place, which are only intended to ensure the relative positioning of the spacers 4. The non-supporting spacers 5 are made of plastic foam; each tank 3 is 25 cm thick and has five load-bearing spacers 4 and three non-load-bearing spacers 5.

La grande face du caisson 3, qui repose sur les lattes 2, déborde de la paroi latérale du caisson sur les deux petits côtés 6 de cette grande face. Dans chaque angle du caisson, sur cette partie débordante, on a prévu des tasseaux 7 qui ont l'épaisseur de cette partie débordante. Ces tasseaux 7 constituent les moyens de fixation du caisson 3.The large face of the box 3, which rests on the slats 2, protrudes from the side wall of the box on the two short sides 6 of this large face. In each corner of the box, on this projecting part, battens 7 are provided which have the thickness of this projecting part. These cleats 7 constitute the means for fixing the box 3.

Ces moyens de fixation 7 coopèrent avec des organes de retenue constitués de goujons 8 soudés sur la structure porteuse 1 du navire, ces goujons 8 comportant une extrémité filetée avec laquelle coopère un écrou qui s'appuie sur une plaquette carrée. Lorsque quatre caissons 3 sont mis en place de façon qu'ils aient chacun un angle adjacent au goujon 8, on peut maintenir les quatre tasseaux 7, qui se trouvent au voisinage de ce goujon 8, au moyen de la plaquette associée à ce goujon.These fastening means 7 cooperate with retaining members made up of studs 8 welded to the load-bearing structure 1 of the ship, these studs 8 comprising a threaded end with which cooperates a nut which rests on a square plate. When four boxes 3 are put in place so that they each have an angle adjacent to the stud 8, the four battens 7, which are located in the vicinity of this stud 8, can be maintained by means of the plate associated with this stud.

Les caissons 3 sont en appui l'un contre l'autre selon leurs faces perpendiculaires aux alignements de goujons 8, mais, dans le sens perpendiculaire, les caissons 3 sont espacés par une zone de joint où se trouvent les tasseaux 7 et les organes de retenue. Après que l'on ait vissé tous les organes de retenue, les zones de joint sont bouchées par les cales 9 en matière plastique, ces cales présentant des fentes longitu­dinales, qui permettent leur insertion avec serrage élastique dans les zones de joint. Les parties de zones de joint non remplies par les cales 9 peuvent être remplies de laine de verre.The boxes 3 are in abutment against one another along their faces perpendicular to the alignment of studs 8, but, in the perpendicular direction, the boxes 3 are spaced by a joint zone where the battens 7 and the members of detention. After all the retaining members have been screwed on, the joint zones are blocked by the plastic shims 9, these shims having longitudinal slots, which allow their insertion with elastic clamping in the joint zones. The parts of the joint zones which are not filled by the shims 9 can be filled with glass wool.

La barrière d'isolation secondaire comporte, au-­dessus de cette deuxième couche, qui vient d'être décrite, une première couche constituée de caissons désignés chacun par la référence 10 dans leur ensemble. L'ensemble des cais­sons 10 repose directement sur l'ensemble des caissons 3. Chaque caisson 10 est constituée d'une boîte parallélépipédique réalisée en bois contreplaqué; ces boîtes ont une épaisseur de 20 cm et des grandes faces,qui ont identiquement les mêmes dimensions que celles des grandes faces des caissons 3.The secondary insulation barrier comprises, above this second layer, which has just been described, a first layer consisting of boxes each designated by the reference 10 as a whole. The set of boxes 10 rests directly on the set of boxes 3. Each box 10 consists of a parallelepiped box made of plywood; these boxes have a thickness of 20 cm and large faces, which have identically the same dimensions than those of the large faces of the boxes 3.

A l'intérieur de chaque caisson 10, on trouve, parallèlement aux petits côtés, sept entretoises porteuses équidistantes 11 et parallèlement aux grands côtés, trois entretoises non porteuses 12. Les entretoises porteuses 11 sont des plaques de contreplaqué insérées entre les deux gran­des faces du caisson 10. Les entretoises non porteuses 12 sont réalisées en mousse plastique et ont le même rôle que les entre­toises 5 précédemment décrites.Inside each box 10, there are, parallel to the short sides, seven equidistant carrier spacers 11 and parallel to the long sides, three non-carrier spacers 12. The carrier spacers 11 are plywood plates inserted between the two large faces of the box 10. The non-supporting spacers 12 are made of plastic foam and have the same role as the spacers 5 previously described.

La grande face du caisson 10,qui se trouve vers l'intérieur de la cuve, c'est-à-dire du côté opposé au caisson 3, porte deux rainures 13 parallèles aux grands côtés du cais­son ; ces rainures 13 sont pratiquées dans l'épaisseur des grandes faces du caisson et elles ont une section en I. A l'in­térieur de ces rainures 13, on met en place des ailes de sou­dures 14 constituées d'une bande d'invar pliée en équerre, pour avoir une section droite en L.The large face of the box 10, which is located towards the inside of the tank, that is to say on the side opposite to the box 3, carries two grooves 13 parallel to the long sides of the box; these grooves 13 are formed in the thickness of the large faces of the box and they have an I-section. Inside these grooves 13, weld wings 14 are put in place consisting of an invar strip folded in square, to have a cross section in L.

Les organes de retenue de cette première couche de la barrière d'isolation secondaire sont constitués par des tiges 15, dont la base est vissée dans une douille 8 a soudée sur la structure porteuse 1 du navire.The retaining members of this first layer of the secondary insulating barrier are constituted by rods 15, whose base is screwed into a sleeve 8 is welded to the bearing structure 1 of the vessel.

Dans les zones de joint comprises entre les tiges 15, on insère des cales de matière plastique qui comportent des fentes longitudinales de façon à pouvoir être insérées par compression élastique dans les zones de joint et à s'y maintenir ensuite par blocage élastique. Ces cales comportent des rainures longitudinales ayant le même rôle que les rainures des cales 9. Les parties des zones de joint de cette première couche, qu'elles ne sont pas occupées par les cales de matière plastique isolante, peuvent avantageusement être bourrées de laine de verre pour améliorer l'isolation.In the joint zones between the rods 15, plastic shims are inserted which have longitudinal slots so that they can be inserted by elastic compression in the joint zones and then be held there by elastic blocking. These shims have longitudinal grooves having the same role as the grooves of the shims 9. The parts of the joint zones of this first layer, that they are not occupied by the shims of insulating plastic material, can advantageously be stuffed with wool of glass to improve insulation.

Sur la deuxième couche de la barrière isolante secondaire, on met en place la barrière d'étanchéité secondaire qui est constituée par des virures d'invar 16 à bords relevés. Ces virures 16 sont disposées entre deux ailes de soudure 14 consécutives : elles ont une largeur de 50 cm ; les soudures sont réalisées de part et d'autre des ailes 14 de façon conti­nue par assurer l'étanchéité. Les ailes 14 retiennent la barrière d'étanchéité secondaire sur les caissons 10. La sur­face d'appui de la barrière d'étanchéité secondaire est conti­nue même au droit des zones de joint entre les caissons 10 en raison de la présente des cales notamment.On the second layer of the secondary insulating barrier, the secondary sealing barrier which is constituted by invar strakes 16 with raised edges is put in place. These strakes 16 are arranged between two welding wings 14 consecutive: they are 50 cm wide; the welds are made on either side of the wings 14 continuously to ensure sealing. The wings 14 retain the secondary sealing barrier on the caissons 10. The bearing surface of the secondary sealing barrier is continuous even at the level of the joint areas between the caissons 10 due to the presence of shims in particular.

La barrière d'isolation primaire est constituée au moyen de caissons 17 qui sont maintenus en position par des or­ganes d'ancrage fixés dans des embases 18 reliées aux douilles 8 a.The primary insulation barrier is constituted by means of boxes 17 which are held in position by anchoring members fixed in bases 18 connected to the sockets 8 a .

Chaque caisson 17 est une boîte parallélépipédique rectangle réalisée en bois contreplaqué ; l'épaisseur de la boîte est de 20 cm et les dimensions des grandes faces sont identiques à celles des caissons 3 et 10. A l'intérieur des caissons 17, sont disposées sept entretoises porteuses dont le positionnement relatif est maintenu par des entretoises non porteuses réalisées en mousse plastique. La grande face du caisson 17, qui se trouve vers l'intérieur de la cuve, porte des rainures 19 pratiquées dans l'épaisseur de la paroi et parallèles aux rainures 13. Ces rainures 19 ont une section droite en T ; elles servent au positionnement d'ailes de soudage 20 identiques aux ailes 14 . La grande face du caisson 17, qui est opposée à celle qui porte les rainures 19, porte également des rainures pratiquées au droit de et dans une entretoise porteuse : ces rainures sont destinées à loger les ailes de soudage 14 et les bords relevés des virures 16 qui leur sont associés. Les grandes faces des caissons 17, qui portent les rainures 19, présentent, grâce à des moyens connus qui sont notamment décrits dans le brevet français n° 2 527 544, une surface continue sur laquelle peut venir s'appuyer la barrière d'étanchéité primaire de la cuve. Cette barrière d'étanchéité primaire est réalisée au moyen de virures 21 en invar qui sont indentiques aux virures 16 précédemment décrites. Les virures 21 sont soudées à bords relevés de part et d'autre des ailes de soudure 20 mises en place dans les rainures 19.Each box 17 is a rectangular parallelepiped box made of plywood; the thickness of the box is 20 cm and the dimensions of the large faces are identical to those of the boxes 3 and 10. Inside the boxes 17, seven load-bearing spacers are arranged, the relative positioning of which is maintained by non-load-bearing spacers made of plastic foam. The large face of the box 17, which is located towards the inside of the tank, carries grooves 19 formed in the thickness of the wall and parallel to the grooves 13. These grooves 19 have a cross section in T; they are used for positioning welding wings 20 identical to the wings 14. The large face of the box 17, which is opposite to that which carries the grooves 19, also carries grooves made in line with and in a load-bearing spacer: these grooves are intended to house the welding wings 14 and the raised edges of the strakes 16 associated with them. The large faces of the boxes 17, which carry the grooves 19, have, thanks to known means which are described in particular in French Patent No. 2,527,544, a continuous surface on which the primary sealing barrier can bear. of the tank. This primary sealing barrier is produced by invar strakes 21 which are identical to strakes 16 previously described. The strakes 21 are welded with raised edges and on the other side of the weld wings 20 placed in the grooves 19.

Les caissons 3, 10 et 17, qui ont été précédemment décrits en détail, sont remplis d'un matériau particulaire thermiquement isolant, tel que par exemple de la perlite expan­sée.The boxes 3, 10 and 17, which have been previously described in detail, are filled with a thermally insulating particulate material, such as for example expanded perlite.

Le volume V, qui est compris entre la cloison externe 1 de la cuve et la barrière d'étanchéité secondaire constituée par les virures 16, est à une pression absolue comprise entre 0,1 et 300 mbars. C'est dans ce volume que sont disposés, selon la présente invention, des éléments réflecteurs de rayonnement.The volume V, which is between the external partition 1 of the tank and the secondary sealing barrier constituted by the strakes 16, is at an absolute pressure of between 0.1 and 300 mbar. It is in this volume that are arranged, according to the present invention, radiation reflecting elements.

Selon un premier mode de réalisation de l'inven­tion qui est représenté à la figure 2, certains de tels élé­ments réflecteurs 22 recouvrent intérieurement les grandes faces des caisses ou caissons parallélépipédiques 3, 10 de la barrière d'isolation secondaire. Certains de ces éléments réflecteurs de rayonnement peuvent également recouvrir les parois du cloisonnement intérieur constitué par les entre­toises porteuses 4 et non porteuses 5. Ces éléments réflec­teurs de rayonnement peuvent être disposés dans des caissons de la première couche d'isolation et/ou dans des caissons de la deuxième couche d'isolation.According to a first embodiment of the invention which is shown in Figure 2, some of such reflective elements 22 internally cover the large faces of the boxes or parallelepiped boxes 3, 10 of the secondary insulation barrier. Some of these radiation-reflecting elements may also cover the walls of the interior partitioning formed by the load-bearing 4 and non-load-bearing spacers 5. These radiation-reflecting elements can be placed in boxes of the first insulation layer and / or in boxes of the second layer of insulation.

En variante, on peut aussi prévoir de disposer certains de ces éléments réflecteurs de rayonnement entre les caisses 3 de la deuxième couche de la barrière isolante se­condaire et la cloison externe 1 de la cuve.As a variant, it is also possible to arrange some of these radiation reflecting elements between the boxes 3 of the second layer of the secondary insulating barrier and the external partition 1 of the tank.

Ces éléments 22 réflecteurs de rayonnement sont constitués par un matériau ayant un haut pouvoir de réflec­tion, tel que, par exemple, des feuilles d'aluminium poli.These radiation reflecting elements 22 are made of a material having a high reflectivity, such as, for example, sheets of polished aluminum.

Selon un second mode de réalisation de la pré­sente invention, les éléments réflecteurs de rayonnement sont des éléments particulaires 23 qui sont mélangés à l'isolant thermique particulaire 24 comme représenté sur la figure 3.According to a second embodiment of the present invention, the radiation reflecting elements are particulate elements 23 which are mixed with the particulate thermal insulator 24 as shown in FIG. 3.

Un matériau de liaison peut être mélangé à l'iso­lant thermique particulaire 24 et aux éléments réflecteurs de rayonnement 23 sous forme particulaire pour maintenir, au cours du temps, l'homogénéité du mélange des deux matériaux particulaires et éviter ainsi la ségrégation de ce mélange. Ce matériau de liaison peut être un matériau à propriétés adhésives réparti dans le mélange de matériau particulaire qui forme le remplissage des caisses de la barrière isolante secondaire.A bonding material can be mixed with the particulate thermal insulator 24 and the radiation reflecting elements 23 in particulate form to maintain, over time, the homogeneity of the mixture of the two particulate materials and thus avoid segregation of this mixture. This bonding material can be a material with adhesive properties distributed in the mixture of particulate material which forms the filling of the boxes of the secondary insulating barrier.

On utilise avantageusement comme matériau parti­culaire constituant les éléments réflecteurs de rayonnement 23 de la poudre d'aluminium. Dans ce cas, si le matériau particulaire constituant l'isolant thermique est de la per­lite expansée, on constate qu'au cours du temps, il n'y a qu'une très faible tendance à la ségrégation du mélange étant donné que les densités apparentes des deux matériaux particulaires sont sensiblement voisines.The particulate material constituting the radiation reflecting elements 23 of the aluminum powder is advantageously used. In this case, if the particulate material constituting the thermal insulator is expanded perlite, it can be seen that over time there is only a very slight tendency to segregate the mixture since the apparent densities of the two particulate materials are substantially similar.

Dans le cas où on utilise de la perlite expan­sée et de la poudre d'aluminium, le mélange de matériaux par­ticulaires, qui forme le remplissage des caissons de la bar­rière isolante secondaire, contient, de préférence, environ 10% en poids de poudre d'aluminium par rapport au poids total du mélange de matériaux particulaires.In the case where expanded perlite and aluminum powder are used, the mixture of particulate materials, which forms the filling of the boxes of the secondary insulating barrier, preferably contains approximately 10% by weight of powder of aluminum relative to the total weight of the mixture of particulate materials.

Selon un autre mode de réalisation de la présente invention, la barrière d'isolation primaire sera réalisée à l'identique de la barrière d'isolation secondaire : cais­sons isolants avec éléments réflecteurs et poudre d'alumi­nium, le volume de cette isolation étant également maintenu sous vide.According to another embodiment of the present invention, the primary insulation barrier will be produced in the same way as the secondary insulation barrier: insulating boxes with reflective elements and aluminum powder, the volume of this insulation also being maintained under vacuum.

Claims (14)

1. Cuve étanche et thermiquement isolante destinée au stockage d'un gaz liquéfié à basse température et constituée d'au moins une barrière d'étanchéité et d'au moins une barrière isolante de volume V comprise entre la cloison externe de la cuve et ladite barrière d'étanchéité, ledit volume V étant à une pression abso­lue comprise entre 0,1 et 300 mbars, caractérisée par le fait que le volume V contient des éléments réflecteurs de rayonnement (22, 23) , au moins certains des éléments réflecteurs (22) de rayonnement étant disposés selon des surfaces sensiblement planes, et qu'une barrière d'isolation secondaire est constituée au moyen de caisses (3, 10) contenant un isolant thermique par­ticulaire (24), les éléments réflecteurs de rayonnement sensi­blement plans (22) recouvrant au moins une partie des surfaces planes présentées intérieurement par les caisses (3, 10) de la barrière d'isolation secondaire.1. Watertight and thermally insulating tank intended for the storage of a liquefied gas at low temperature and consisting of at least one sealing barrier and at least one insulating barrier of volume V comprised between the external partition of the tank and said sealing barrier, said volume V being at an absolute pressure of between 0.1 and 300 mbar, characterized in that the volume V contains radiation reflecting elements (22, 23), at least some of the reflecting elements (22 ) of radiation being arranged on substantially planar surfaces, and a secondary insulation barrier is formed by means of boxes (3, 10) containing a particulate thermal insulator (24), the substantially planar radiation reflecting elements (22) covering at least part of the flat surfaces presented internally by the boxes (3, 10) of the secondary insulation barrier. 2. Cuve selon la revendication 1, caractérisée par le fait que ladite cuve est constituée de deux barrières d'étan­chéité successives, l'une primaire (21) au contact avec le gaz liquéfié et l'autre secondaire (16) disposée entre la barrière primaire et la cloison externe (1) de la cuve, le volume V étant compris entre la cloison externe (1) de la cuve et la barrière d'étanchéité secondaire (16).2. Tank according to claim 1, characterized in that said tank consists of two successive sealing barriers, one primary (21) in contact with the liquefied gas and the other secondary (16) disposed between the barrier primary and the external partition (1) of the tank, the volume V being between the external partition (1) of the tank and the secondary sealing barrier (16). 3. Cuve selon la revendication 1 ou 2, caractérisée par le fait qu'au moins certains éléments réflecteurs (23) de rayonnement sont réalisés sous forme de matériau particulaire.3. Tank according to claim 1 or 2, characterized in that at least some reflecting elements (23) of radiation are made in the form of particulate material. 4. Cuve selon la revendication 1, caractérisée par le fait que les caisses (3,10) de la barrière d'isolation secondaire sont sensiblement parallélépipédiques et au moins certains des éléments réflecteurs (22) de rayonnement recou­ vrent intérieurement les grandes faces desdites caisses.4. Tank according to claim 1, characterized in that the boxes (3,10) of the secondary insulation barrier are substantially parallelepiped and at least some of the reflective elements (22) of radiation covered internally the large faces of said cases. 5. Cuve selon l'une des revendications 1 ou 4, caractérisée par le fait que les caisses (3,10) de la barrière d'isolation secondaire comporte des cloisonnements intérieurs (4,5, 11,12) et au moins certains éléments réflecteurs de rayonnement (22) recou­vrent les parois desdits cloisonnements intérieurs (4, 5, 11, 12).5. Tank according to one of claims 1 or 4, characterized in that the boxes (3,10) of the secondary insulation barrier has internal partitions (4,5, 11,12) and at least some elements radiation reflectors (22) cover the walls of said interior partitions (4, 5, 11, 12). 6. Cuve selon la revendication 1 , caractérisée par le fait qu'au moins certains des éléments réflecteurs de rayon­nement (22) sont disposés entre, d'une part, les caisses (3) de la barrière isolante secondaire et, d'autre part, la cloison externe (1) de la cuve.6. Tank according to claim 1, characterized in that at least some of the radiation reflecting elements (22) are arranged between, on the one hand, the boxes (3) of the secondary insulating barrier and, on the other hand , the external partition (1) of the tank. 7. Cuve selon l'une des revendications 1 et 4 à 6 caractérisée par le fait que les éléments réflecteurs de rayon­nement (22) sont constitués par des feuilles d'aluminium poli.7. Tank according to one of claims 1 and 4 to 6 characterized in that the radiation reflecting elements (22) consist of sheets of polished aluminum. 8. Cuve selon la revendication 3 , caractérisée par le fait que la barrière d'isolation secondaire est cons­tituée au moyen de caisses (3, 10) contenant un isolant thermique particulaire (24) et les éléments réflecteurs de rayonnement sous forme particulaire (23) sont mélangés à l'isolant ther­mique particulaire (24) contenu dans les caisses.8. Tank according to claim 3, characterized in that the secondary insulation barrier is constituted by means of boxes (3, 10) containing a particulate thermal insulator (24) and the radiation reflecting elements in particulate form (23) are mixed with the particulate thermal insulation (24) contained in the boxes. 9. Cuve selon la revendication 6, caractérisée par le fait qu'un matériau de liaison est mélangé à l'isolant thermique particulaire (24)et aux éléments réflecteurs de rayonne­ment sous forme particulaire (23),pour maintenir au cours du temps l'homogénéité du mélange des deux matériaux particulaires.9. Tank according to claim 6, characterized in that a bonding material is mixed with the particulate thermal insulator (24) and the radiation reflecting elements in particulate form (23), to maintain over time the homogeneity of the mixture of the two particulate materials. 10. Cuve selon l'une des revendications 8 ou 9 , caractérisée par le fait que le matériau particulaire, qui constitue les éléments réflecteurs de rayonnement (23), est de la poudre d'aluminium.10. Tank according to one of claims 8 or 9, characterized in that the particulate material, which constitutes the radiation reflecting elements (23), is aluminum powder. 11. Cuve selon la revendication 9, caractérisée par le fait que le matériau de liaison est un matériau à propriétés adhésives réparti dans le mélange de matériaux particulaires, qui forme le remplissage des caisses (3, 10)de la barrière isolante secondaire.11. Tank according to claim 9, characterized in that the bonding material is a material with adhesive properties distributed in the mixture of particulate materials, which forms the filling of the boxes (3, 10) of the secondary insulating barrier. 12. Cuve selon l'une des revendications 8 à 11, caractérisée par le fait que le mélange de matériaux particu­laires, qui forme le remplissage des caisses de la barrière isolante secondaire, contient de 1 à 25 % en poids de matériau particulaire constituant les éléments réflecteurs de rayonnement (23).12. Tank according to one of claims 8 to 11, characterized by the fact that the mixture of particulate materials, which forms the filling of the boxes of the secondary insulating barrier, contains from 1 to 25% by weight of the particulate material constituting the radiation reflecting elements (23). 13. Cuve selon l'une des revendications 1 a 12, caractérisée par le fait que sa cloison externe (1) de la cuve est constituée par la double coque d'un navire.13. Tank according to one of claims 1 to 12, characterized in that its external partition (1) of the tank is constituted by the double hull of a ship. 14. Navire transporteur de gaz liquéfié à basse température, notamment de gaz naturel liquéfié à forte teneur en méthane, caractérisé par le fait qu'il comporte au moins une cuve selon l'une des revendications 1 à 13.14. Ship carrying liquefied gas at low temperature, in particular liquefied natural gas with a high methane content, characterized in that it comprises at least one tank according to one of claims 1 to 13.
EP86401673A 1985-08-06 1986-07-28 Thermally insulated impervious container, and ship carrying it Expired EP0214007B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8512038 1985-08-06
FR8512038A FR2586082B1 (en) 1985-08-06 1985-08-06 WATERPROOF AND THERMALLY INSULATING TANK AND VESSEL COMPRISING SAME

Publications (2)

Publication Number Publication Date
EP0214007A1 true EP0214007A1 (en) 1987-03-11
EP0214007B1 EP0214007B1 (en) 1989-10-11

Family

ID=9322040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401673A Expired EP0214007B1 (en) 1985-08-06 1986-07-28 Thermally insulated impervious container, and ship carrying it

Country Status (5)

Country Link
EP (1) EP0214007B1 (en)
JP (1) JPS6249099A (en)
KR (1) KR900007202B1 (en)
DE (1) DE3666204D1 (en)
FR (1) FR2586082B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2166666A1 (en) * 1998-07-10 2002-04-16 Gaz Transp Et Tecnigaz Waterproof and heat-insulated tank incorporated in ship supporting structure and improved in heat insulating barrier
ES2285887A1 (en) * 2004-03-17 2007-11-16 Gaz Transport Et Technigaz Self-supporting timber box for the support and thermal insulation of an impermeable tank membrane
EP3733501A4 (en) * 2017-12-27 2021-10-27 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Membrane type heat insulation system for cryogenic liquefied gas carrier cargo tank and liquefied gas fuel container
CN114568030A (en) * 2019-10-18 2022-05-31 气体运输技术公司 Sealed and thermally insulated tank

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2698960B2 (en) * 1993-10-28 1998-01-19 真澄 楠 Mixing device
JP3001387B2 (en) * 1993-12-27 2000-01-24 鹿島建設株式会社 Kneading device
FR2781036B1 (en) * 1998-07-10 2000-09-08 Gaz Transport & Technigaz WATERPROOF AND THERMALLY INSULATING TANK WITH SIMPLIFIED INSULATING BARRIER, INTEGRATED INTO A VESSEL CARRIER STRUCTURE
FR2780942B1 (en) 1998-07-10 2000-09-08 Gaz Transport & Technigaz WATERPROOF AND THERMALLY INSULATING TANK WITH IMPROVED ANGLE STRUCTURE, INTEGRATED INTO A SHIP-CARRIED STRUCTURE
FR2785034B1 (en) * 1998-10-23 2000-12-22 Gaz Transport & Technigaz PROCESS FOR ELIMINATE THE EVAPORATION OF A LIQUEFIED GAS STORED IN A WATERPROOF AND ISOTHERMAL TANK, AND DEVICE FOR ITS IMPLEMENTATION
JP4293896B2 (en) * 2002-12-24 2009-07-08 旭化成ホームズ株式会社 Airtight insulation structure around the outer wall opening
KR101466679B1 (en) * 2007-09-10 2014-11-28 가부시키가이샤 가네카 Heat-insulating box for membrane type liquefied-natural-gas tanker and method of transporting liquefied natural gas with the same
KR101055701B1 (en) * 2009-09-21 2011-08-11 한국과학기술원 Insulation Structure and Cryogenic Liquid Storage Tank
KR101225180B1 (en) * 2010-09-28 2013-01-22 삼성중공업 주식회사 Insulation pane for LNG tank and Insulation structure including the same
FR2972719B1 (en) * 2011-03-15 2013-04-12 Gaztransp Et Technigaz INSULATING BLOCK FOR THE MANUFACTURE OF A SEALED TANK WALL
FR2978748B1 (en) * 2011-08-01 2014-10-24 Gaztransp Et Technigaz SEALED AND THERMALLY INSULATED TANK
KR101884758B1 (en) * 2011-12-27 2018-08-03 대우조선해양 주식회사 Multiple insulation box for a lng storage tank
CN104981645B (en) * 2013-03-01 2018-07-20 松下知识产权经营株式会社 Heat-insulated container
WO2014132665A1 (en) * 2013-03-01 2014-09-04 パナソニック株式会社 Insulating container and insulating structure
FR3004416B1 (en) * 2013-04-12 2015-04-03 Gaztransp Et Technigaz SEALED MEMBRANE AND METHOD FOR MANUFACTURING THE SAME
FR3008163B1 (en) * 2013-07-02 2015-11-13 Gaztransp Et Technigaz CALORIFUGE ELEMENT SUITABLE FOR THE PRODUCTION OF AN INSULATING BARRIER IN A WATERPROOF AND INSULATING TANK
JP6435517B2 (en) * 2013-09-12 2018-12-12 パナソニックＩｐマネジメント株式会社 Insulated container with vacuum insulation
WO2016027461A1 (en) * 2014-08-21 2016-02-25 パナソニックＩｐマネジメント株式会社 Heat-insulated container and heat insulation structure
FR3049678B1 (en) * 2016-04-01 2018-04-13 Gaztransport Et Technigaz THERMALLY INSULATING EDGE BLOCK FOR THE MANUFACTURE OF A TANK WALL

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967152A (en) * 1956-04-26 1961-01-03 Union Carbide Corp Thermal insulation
FR2527544A1 (en) * 1982-06-01 1983-12-02 Gaz Transport SEALED AND THERMALLY INSULATING TANK INTEGRATED WITH THE CARRIER STRUCTURE OF A SHIP AND SHIP COMPRISING SAME
FR2535831A1 (en) * 1982-11-05 1984-05-11 Gaz Transport Method to improve the thermal insulation of a tank intended for storing a liquefied gas and corresponding tank
GB2158214A (en) * 1984-05-04 1985-11-06 Nippon Kokan Kk Method and system for insulating a cargo tank of a liquefied gas tanker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154363A (en) * 1975-11-18 1979-05-15 Union Carbide Corporation Cryogenic storage container and manufacture
FR2504882B1 (en) * 1981-04-30 1985-11-08 Gaz Transport WATERPROOF AND THERMALLY INSULATING TANK INTEGRATED INTO THE CARRIER STRUCTURE OF A VESSEL

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967152A (en) * 1956-04-26 1961-01-03 Union Carbide Corp Thermal insulation
FR2527544A1 (en) * 1982-06-01 1983-12-02 Gaz Transport SEALED AND THERMALLY INSULATING TANK INTEGRATED WITH THE CARRIER STRUCTURE OF A SHIP AND SHIP COMPRISING SAME
FR2535831A1 (en) * 1982-11-05 1984-05-11 Gaz Transport Method to improve the thermal insulation of a tank intended for storing a liquefied gas and corresponding tank
GB2158214A (en) * 1984-05-04 1985-11-06 Nippon Kokan Kk Method and system for insulating a cargo tank of a liquefied gas tanker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2166666A1 (en) * 1998-07-10 2002-04-16 Gaz Transp Et Tecnigaz Waterproof and heat-insulated tank incorporated in ship supporting structure and improved in heat insulating barrier
ES2285887A1 (en) * 2004-03-17 2007-11-16 Gaz Transport Et Technigaz Self-supporting timber box for the support and thermal insulation of an impermeable tank membrane
EP3733501A4 (en) * 2017-12-27 2021-10-27 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Membrane type heat insulation system for cryogenic liquefied gas carrier cargo tank and liquefied gas fuel container
US11597477B2 (en) 2017-12-27 2023-03-07 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Membrane type insulation system for cryogenic liquefied gas carrier cargo tank and liquefied gas fuel container
CN114568030A (en) * 2019-10-18 2022-05-31 气体运输技术公司 Sealed and thermally insulated tank
CN114568030B (en) * 2019-10-18 2023-10-24 气体运输技术公司 Sealed and thermally insulated tank, vessel, transfer system and method of loading and unloading a vessel

Also Published As

Publication number Publication date
EP0214007B1 (en) 1989-10-11
KR870002418A (en) 1987-03-31
FR2586082B1 (en) 1988-07-08
DE3666204D1 (en) 1989-11-16
KR900007202B1 (en) 1990-10-05
FR2586082A1 (en) 1987-02-13
JPS6249099A (en) 1987-03-03

Similar Documents

Publication Publication Date Title
EP0214007B1 (en) Thermally insulated impervious container, and ship carrying it
EP0408596B1 (en) Improved watertight, heat-insulated tank incorporated in the load-bearing structure of a ship
EP0543686B1 (en) Fluid-tight and heat-insulating tank integrated in a ship's hull structure
EP3198186B1 (en) Sealed and insulating vessel comprising a bridging element between the panels of the secondary insulation barrier
EP2739895B1 (en) Sealed, thermally-insulating vessel
WO2016097578A2 (en) Insulating unit suitable for making an insulating wall in a sealed tank
WO2017064426A1 (en) Sealed and thermally insulating tank
FR2527544A1 (en) SEALED AND THERMALLY INSULATING TANK INTEGRATED WITH THE CARRIER STRUCTURE OF A SHIP AND SHIP COMPRISING SAME
FR2798902A1 (en) Thermally-insulated tank integrated into load-bearing structure of ship employs lower density foam block insulation adhered over transoms
FR2877639A1 (en) SEALED AND THERMALLY INSULATED TANK INTEGRATED WITH THE SHELLING STRUCTURE OF A SHIP
FR3038690A1 (en) THERMALLY INSULATING, WATERPROOF TANK WITH SECONDARY SEALING MEMBRANE EQUIPPED WITH ANGLE ARRANGEMENT WITH WALL-MOLDED METAL SHEETS
WO2015022473A2 (en) Sealed, thermally insulating vessel comprising a corner part
WO2019043349A1 (en) Sealed and thermally insulating tank comprising an anti-convective covering strip
FR3052227A1 (en) THERMALLY INSULATING INSULATING BLOCK AND TANK INTEGRATED INTO A POLYEDRIATE CARRIER STRUCTURE
EP3679289A1 (en) Sealed and thermally insulating tank with anti-convective filling element
EP2984381A1 (en) Insulating block for producing a sealed and insulated tank wall
WO2021239767A1 (en) Insulating block suitable for making an insulating wall in a cold liquid storage tank
WO2017207904A1 (en) Thermally-insulating sealed tank incorporated into a polyhedron-shaped load-bearing structure
WO2019043348A1 (en) Sealed and thermally insulating vessel having an anti-convective filler plate
EP2986885B1 (en) Tight and thermally insulating vessel
WO2024125850A1 (en) Sealed and thermally insulating tank comprising a through-element
WO2022013497A1 (en) Sealed and thermally insulating tank
FR3135773A1 (en) WATERPROOF AND THERMALLY INSULATING TANK INTEGRATED INTO A SUPPORT STRUCTURE
FR3112586A1 (en) Watertight and thermally insulated tank.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19860729

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE IT NL SE

17Q First examination report despatched

Effective date: 19871127

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE IT NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19891011

Ref country code: NL

Effective date: 19891011

Ref country code: SE

Effective date: 19891011

REF Corresponds to:

Ref document number: 3666204

Country of ref document: DE

Date of ref document: 19891116

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19950804

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950817

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19960731

BERE Be: lapsed

Owner name: GAZ-TRANSPORT

Effective date: 19960731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970402