WO2015041542A1 - A support system for bi-lobe cylindrical tanks - Google Patents

A support system for bi-lobe cylindrical tanks Download PDF

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Publication number
WO2015041542A1
WO2015041542A1 PCT/NO2014/050171 NO2014050171W WO2015041542A1 WO 2015041542 A1 WO2015041542 A1 WO 2015041542A1 NO 2014050171 W NO2014050171 W NO 2014050171W WO 2015041542 A1 WO2015041542 A1 WO 2015041542A1
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WIPO (PCT)
Prior art keywords
shells
arrangement according
welded
lobe
support
Prior art date
Application number
PCT/NO2014/050171
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French (fr)
Inventor
Harald Aarseth
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Tanker Engineering As
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Publication of WO2015041542A1 publication Critical patent/WO2015041542A1/en

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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
    • F17C1/002—Storage in barges or on ships
    • 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
    • F17C2201/0152—Lobes
    • 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
    • F17C2201/0166—Shape complex divided in several chambers
    • 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
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • F17C2203/0643—Stainless steels
    • 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
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • 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
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0648—Alloys or compositions of metals
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/0192—Details of mounting arrangements with external bearing means
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/232—Manufacturing of particular parts or at special locations of walls
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • 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
    • 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

Definitions

  • the subject invention is related to transportation of liquefied gases at sea, and including liquefied natural gas (LNG) and liquefied petroleum gases (LPG).
  • LNG liquefied natural gas
  • LPG liquefied petroleum gases
  • Liquefied gases are transported in large volumes at sea, and in various types of liquefied gas carriers.
  • Bi-lobe cylindrical cargo tanks are applied for certain types of liquefied gas carriers, and so far especially for gas tankers transporting LPG and ethylene.
  • a bi-lobe tank is composed of two equal and partial cylindrical tanks built into each other, and the common divisional section is normally made up by a perforated bulkhead.
  • bi-lobe cargo tanks have to be suitable for low- temperature services, and can for example be stainless steels, Ni-steels, aluminium, etc.
  • bi-lobe cylindrical tanks have been applied for a few smaller ships for transportation of liquefied natural gas (LNG), and at a temperature of - 163 °C.
  • LNG liquefied natural gas
  • bi-lobe cylindrical tanks are favourable and preferable for application in liquefied gas tankers due to better utilization of surrounding hull compared to use of ordinary cylindrical tanks of a similar diameter.
  • bi-lobe cylindrical tanks have an attractive ratio for surface of the tanks versus volume of tanks, and accordingly with less heat leakage into the tanks compared to two cylindrical tanks of same total volume.
  • the predominant support system applied so far for bi-lobe tanks might be impossible to apply for comparatively large diameters and volumes, and can be a limitation for applying medium-size and large bi-lobe tanks for transportation of liquefied natural gas (LNG) and as well for ethylene transported at - 104 °C.
  • LNG liquefied natural gas
  • Fig. 1 shows a typical existing support system for bi-lobe tanks.
  • the bi-lobe tanks are normally located in the longitudinal direction of the ships, and Fig. l shows a transverse section of the ship at a support for one bi-lobe tank.
  • Each bi-lobe tank is normally supported in two cradles (and of which one is shown in Fig. l).
  • Fig. 1 shows the following details:
  • (4) is the internal strengthening of the bi-lobe tank in way of supports, and consisting of a ring girder with flange.
  • (6) is the steel support system, and including the cradles, for transferring the static and dynamic forces from the bi-lobe tank to structural members of the surrounding hull.
  • (8) is a load carrying thermally insulating material with sufficient strength to carry and transfer the static and dynamic forces from the bi-lobe tank to the supporting hull, and arranged as an in-between layer between steel cradle support (6) and shell (3) of the bi-lobe tank.
  • the in-between load carrying layer might normally be of industrial compressed wood, and with required properties for load and thermal insulation.
  • (9) is the vertical common centreline of the ship and the bi-lobe cargo tank.
  • (10) is the vertical centreline of port side (looking forward) of the bi-lobe tank.
  • (I I) is the vertical centreline of starboard side (looking forward) of the bi-lobe tank.
  • the bi-lobe tank (3) as shown will tend to contract transversely towards the vertical common centreline.
  • the bi-lobe tank (3) Due to the support peak at the vertical centreline (9), the bi-lobe tank (3) will in this area be locked vertically in the original position, and the remaining part of the tank (starboard and port side) will at least theoretically lose the vertical contact with the supporting surfaces outside the peak areas when contracting.
  • the bi-lobe tank will behave as a double cantilever, and a significant shear force and bending moment around the supporting vertical centreline peak will be introduced.
  • the invention is meant to eliminate the support peak at the common centreline (9) as shown in Fig. l by making the support area horizontal between the vertical centrelines (10) and (11).
  • the invented support construction for a bi-lobe tank consists of a vertical and insulated plate (12) which is welded to the external shell periphery of the bi- lobe tank (3), and located in the same vertical plane as the internal ring girder system (4) at each tank support. Furthermore, a horizontal and insulated flange plate (13) is welded to the vertical plate.
  • the horizontal flange plate (13) is resting on the horizontal tween-layer (8) on top of the steel supporting system (6).
  • the maximum transverse extent of the vertical support plate (12) can be the horizontal distance between vertical centrelines (10) and (11), but practically the selected distance might be in the range of about minimum 20% and about maximum 80% of this distance.
  • the temperature of this support system will approximately be the same as the cargo temperature.
  • the bi-lobe tank is free to contract or expand without introducing any additional and unfavourable stresses due to any contraction or expansion.
  • At least two (2) external plates (12) have to be provided, and arranged in the same vertical planes as the internal ring girder plates (4).
  • the bi-lobe tank (3) might in a cold and contracted condition be free to move or slide transversely (at least theoretically) either to starboard side or port side when the vessel is rolling at sea.
  • stopping elements are introduced as shown on Fig. 3.
  • the stopping elements ( 15) are of same material as the tween-layer (8), and are rigidly fixed by bolts or similar to the tween-layer (8), and are of about same length as the flange plate (13)
  • insulated brackets might be introduced in longitudinal direction on one or both sides of the supporting plate (12), and welded to the vertical plate (12) and as well to the flange plate (13).
  • the stopping elements (15) as described above might also be arranged in conjunction with such a bracket system on the vertical support plate (12).
  • the vertical plate (12) might be designed in a more refined way than shown on Fig.2 and Fig.3, and the termination of the vertical support plate (12) at the periphery of the bi-lobe tank (3) might be arranged in a soft and sniped manner.
  • FIG. 5 A related solution to the problem underlying the present invention is illustrated in Fig. 5.
  • Fig. l and Fig. 2 The main difference from the invention showed in Fig. l and Fig. 2 is that the support area between the centrelines (11, 12) is deleted, and the extent of the thermally insulating and load carrying layer (8) is considerably reduced as shown. However, the support area is slightly extended inside the centrelines (10,11) in order to absorb the contraction of the bi-lobe tank during cool-down, and in a cold condition.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catching Or Destruction (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

An arrangement for supporting a bi-lobe tank (3) in a seagoing vessel (1), the tank (3) having first and second equal and partially cylindrical shells built into each other at a common divisional section. The shells are each having a vertical central plane (10, 11), and the arrangement comprises a cradle support (6) lined with a load carrying layer (8) of thermally insulating material. The shells are without direct contact with the cradle support (6) or its load carrying layer (8) in the area between the vertical central planes (10, 11) of the shells. Instead, a separate support (12, 13) or external reinforcement (16, 17) for the shells is arranged in said area.

Description

A SUPPORT SYSTEM FOR BI-LOBE CYLINDRICAL TANKS
The subject invention is related to transportation of liquefied gases at sea, and including liquefied natural gas (LNG) and liquefied petroleum gases (LPG).
Liquefied gases are transported in large volumes at sea, and in various types of liquefied gas carriers.
Bi-lobe cylindrical cargo tanks are applied for certain types of liquefied gas carriers, and so far especially for gas tankers transporting LPG and ethylene.
A bi-lobe tank is composed of two equal and partial cylindrical tanks built into each other, and the common divisional section is normally made up by a perforated bulkhead.
Alternative materials of the bi-lobe cargo tanks have to be suitable for low- temperature services, and can for example be stainless steels, Ni-steels, aluminium, etc. In the last years bi-lobe cylindrical tanks have been applied for a few smaller ships for transportation of liquefied natural gas (LNG), and at a temperature of - 163 °C.
Actually, bi-lobe cylindrical tanks are favourable and preferable for application in liquefied gas tankers due to better utilization of surrounding hull compared to use of ordinary cylindrical tanks of a similar diameter.
Moreover, bi-lobe cylindrical tanks have an attractive ratio for surface of the tanks versus volume of tanks, and accordingly with less heat leakage into the tanks compared to two cylindrical tanks of same total volume.
Transportation of LNG in bi-lobe cylindrical cargo tanks is somewhat more challenging due to increased contraction and expansion of the cargo tanks due to the low temperature of the cargo (- 163 °C), and especially for bi-lobe tanks with larger diameters and volumes.
Actually, the predominant support system applied so far for bi-lobe tanks might be impossible to apply for comparatively large diameters and volumes, and can be a limitation for applying medium-size and large bi-lobe tanks for transportation of liquefied natural gas (LNG) and as well for ethylene transported at - 104 °C.
Fig. 1 shows a typical existing support system for bi-lobe tanks.
The bi-lobe tanks are normally located in the longitudinal direction of the ships, and Fig. l shows a transverse section of the ship at a support for one bi-lobe tank.
Each bi-lobe tank is normally supported in two cradles (and of which one is shown in Fig. l).
Fig. 1 shows the following details:
(I) is the surrounding ship hull
(2) is the inner bottom of the ship
(3) is the bi-lobe tank
(4) is the internal strengthening of the bi-lobe tank in way of supports, and consisting of a ring girder with flange.
(5) is the perforated bulkhead between each half of the bi-lobe tank.
(6) is the steel support system, and including the cradles, for transferring the static and dynamic forces from the bi-lobe tank to structural members of the surrounding hull.
(7) is insulation for all cold surfaces of the bi-lobe tank (shown partly)
(8) is a load carrying thermally insulating material with sufficient strength to carry and transfer the static and dynamic forces from the bi-lobe tank to the supporting hull, and arranged as an in-between layer between steel cradle support (6) and shell (3) of the bi-lobe tank. The in-between load carrying layer might normally be of industrial compressed wood, and with required properties for load and thermal insulation.
(9) is the vertical common centreline of the ship and the bi-lobe cargo tank.
(10) is the vertical centreline of port side (looking forward) of the bi-lobe tank.
(I I) is the vertical centreline of starboard side (looking forward) of the bi-lobe tank. When cooling-down is started, the bi-lobe tank (3) as shown will tend to contract transversely towards the vertical common centreline.
Due to the support peak at the vertical centreline (9), the bi-lobe tank (3) will in this area be locked vertically in the original position, and the remaining part of the tank (starboard and port side) will at least theoretically lose the vertical contact with the supporting surfaces outside the peak areas when contracting.
Accordingly, the bi-lobe tank will behave as a double cantilever, and a significant shear force and bending moment around the supporting vertical centreline peak will be introduced.
Subject invention is shown in principle on Fig.2, Fig.3 and Fig.4 and is invented for overcoming the supporting problems as described above for the support system as shown in Fig. l .
The invention is meant to eliminate the support peak at the common centreline (9) as shown in Fig. l by making the support area horizontal between the vertical centrelines (10) and (11).
This is achieved by introducing an external and insulated support construction of same material as the bi-lobe tank, and arranged as an integral part of the bi-lobe tank. Basically, the invented support construction for a bi-lobe tank consists of a vertical and insulated plate (12) which is welded to the external shell periphery of the bi- lobe tank (3), and located in the same vertical plane as the internal ring girder system (4) at each tank support. Furthermore, a horizontal and insulated flange plate (13) is welded to the vertical plate.
The horizontal flange plate (13) is resting on the horizontal tween-layer (8) on top of the steel supporting system (6).
The maximum transverse extent of the vertical support plate (12) can be the horizontal distance between vertical centrelines (10) and (11), but practically the selected distance might be in the range of about minimum 20% and about maximum 80% of this distance.
As the vertical plate (12) and the horizontal plate (13) are fully insulated, the temperature of this support system will approximately be the same as the cargo temperature.
By the described invention, the bi-lobe tank is free to contract or expand without introducing any additional and unfavourable stresses due to any contraction or expansion.
For bi-lobe tanks with large diameters/volumes, it might be necessary to have at least two internal ring girder plates (4) in way of each support.
In such a case, at least two (2) external plates (12) have to be provided, and arranged in the same vertical planes as the internal ring girder plates (4).
However, with no fixed support peak at the vertical centreline (9), the bi-lobe tank (3) might in a cold and contracted condition be free to move or slide transversely (at least theoretically) either to starboard side or port side when the vessel is rolling at sea.
In order to eliminate such a possibility, stopping elements (15) are introduced as shown on Fig. 3.
The stopping elements ( 15) are of same material as the tween-layer (8), and are rigidly fixed by bolts or similar to the tween-layer (8), and are of about same length as the flange plate (13)
Furthermore, flat bars ( 14) as shown are welded to the support plate construction (12,13),
and for even distribution of the transverse forces acting on the stopping elements (15).
Whenever required, insulated brackets might be introduced in longitudinal direction on one or both sides of the supporting plate (12), and welded to the vertical plate (12) and as well to the flange plate (13). In this regard, the stopping elements (15) as described above might also be arranged in conjunction with such a bracket system on the vertical support plate (12). The vertical plate (12) might be designed in a more refined way than shown on Fig.2 and Fig.3, and the termination of the vertical support plate (12) at the periphery of the bi-lobe tank (3) might be arranged in a soft and sniped manner.
A related solution to the problem underlying the present invention is illustrated in Fig. 5.
The main difference from the invention showed in Fig. l and Fig. 2 is that the support area between the centrelines (11, 12) is deleted, and the extent of the thermally insulating and load carrying layer (8) is considerably reduced as shown. However, the support area is slightly extended inside the centrelines (10,11) in order to absorb the contraction of the bi-lobe tank during cool-down, and in a cold condition.
Due to the shown reduction in support area, a transverse bending moment will appear for the bi-lobe tank, and in order to avoid harmful stress concentrations due to the bending moment at the intersection areas, external insulated brackets (16, 17) are introduced in the intersection area opposite to the internal ring girder system 4 at each support for the bi-lobe tank.

Claims

An arrangement for supporting a bi-lobe tank (3) in a seagoing vessel (1), the tank (3) having first and second equal and partially cylindrical shells built into each other at a common divisional section, the shells each having a vertical central plane (10, 11), the arrangement comprising a cradle support (6) lined with a load carrying layer (8) of thermally insulating material,
characterized in that the shells are without direct contact with the cradle support (6) or its load carrying layer (8) in the area between the vertical central planes (10, 11) of the shells, and that a separate support (12, 13) o external reinforcement (16, 17) for the shells is arranged in said area.
An arrangement according to claim 1, wherein a transverse vertical plate (12) of similar material quality as the bi-lobe tank (3) are welded
transversely to the shell periphery at the area below the intersection of the cylinders of the bi-lobe tank, the vertical plate (12) being insulated on both sides.
An arrangement according to claim 2, wherein the transverse extent of the transverse vertical plate (12) has a width of 20 % to 80 % of the distance between the vertical central planes (10,11) of the cylindrical shells. An arrangement according to claim 2 or 3, wherein a horizontal and insulated support plate (13) of similar material as the transverse vertical plate (12) is welded to the said transverse vertical plate (12), the horizontal plate (13) being supported on the load carrying layer (8) on top of the cradle support (6), the cradle support (6) being welded to a surrounding hull structural system (1, 2).
An arrangement according to claim 4, wherein the bi-lobe tank (3) in a cold and contracted condition is locked transversely against sliding by stopping elements (15) of same or similar material as the load carrying layer (8) bearing on the horizontal plate (13), the stopping elements (15) being fixed to the load carrying layer (8) by bolting or similar.
6. An arrangement according to claim 5, wherein insulated flat bars (14) are welded to the horizontal support plate (13) and to the transverse vertical plate (12) in order to provide even distribution of transverse forces on the stopping elements (15).
7. An arrangement according to any one of claims 2 - 6, wherein insulated brackets in longitudinal direction are welded to the transverse vertical plate (12).
8. An arrangement according to claim 1, wherein the external reinforcement comprises a first bracket (16) which is welded to the shells in a lower intersection area between the shells.
9. An arrangement according to claim 1, wherein a second bracket (17) is welded to the shells in an upper intersection area between the shells.
10. An arrangement according to claim 8 or 9, wherein said bracket (16, 17) is sniped and insulated.
PCT/NO2014/050171 2013-09-20 2014-09-18 A support system for bi-lobe cylindrical tanks WO2015041542A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20131266A NO336727B1 (en) 2013-09-20 2013-09-20 An arrangement for storage of a twin tank
NO20131266 2013-09-20

Publications (1)

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WO2015041542A1 true WO2015041542A1 (en) 2015-03-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106742818A (en) * 2017-01-13 2017-05-31 南通四方罐式储运设备制造有限公司 A kind of many cabin tank containers
CN110612415A (en) * 2016-05-10 2019-12-24 瓦锡兰芬兰有限公司 Storage tank device
US10730591B2 (en) 2016-11-07 2020-08-04 AC-INOX GmbH Multi-lobe cargo tank

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001553A1 (en) * 1982-10-11 1984-04-26 Moss Rosenberg Verft As Saddle support
EP1945498B1 (en) * 2005-12-01 2009-02-25 TGE Marine Gas Engineering GmbH Device for mounting a tank in a ship

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984001553A1 (en) * 1982-10-11 1984-04-26 Moss Rosenberg Verft As Saddle support
EP1945498B1 (en) * 2005-12-01 2009-02-25 TGE Marine Gas Engineering GmbH Device for mounting a tank in a ship

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110612415A (en) * 2016-05-10 2019-12-24 瓦锡兰芬兰有限公司 Storage tank device
US10730591B2 (en) 2016-11-07 2020-08-04 AC-INOX GmbH Multi-lobe cargo tank
CN106742818A (en) * 2017-01-13 2017-05-31 南通四方罐式储运设备制造有限公司 A kind of many cabin tank containers

Also Published As

Publication number Publication date
NO20131266A1 (en) 2015-03-23
NO336727B1 (en) 2015-10-26

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