Liquefied gas storage tank and marine structure comprising same

Abstract

The present disclosure relates to a liquefied gas storage tank and a marine structure including the same. The storage tank includes a plurality of liquefied gas storage tanks received in a plurality of spaces defined in a hull of the marine structure by a cofferdam and arranged in two rows. The cofferdam includes at least one longitudinal cofferdam extending in a longitudinal direction of the hull and at least one transverse cofferdam extending in a transverse direction of the hull. Each of the storage tanks is sealed and thermally insulated by a sealing wall and a thermal insulation wall extending without being disconnected. The longitudinal cofferdam supports load of an upper structure while suppressing a sloshing phenomenon.

Description

technical field [0001] The present invention relates to liquefied gas storage tanks for storing liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG), and more particularly, the present invention relates to a liquefied gas storage tank comprising a plurality of storage tanks arranged in two rows and received in a plurality of spaces, the liquefied gas storage tanks are bounded by longitudinal cofferdams that support the load of the superstructure while inhibiting the sloshing phenomenon ), and the present invention relates to a marine structure comprising the liquefied gas storage tank. Background technique [0002] Natural gas is transported in a gaseous state to consumers over long distances by gas pipelines across land or sea, or in a liquefied gas (LNG or LPG) state by vehicles. Liquefied gas is obtained by cooling natural gas to a cryogenic state (approximately -163°C), where its volume is reduced to approximately 1 / 600 of that at standard...

AI Technical Summary

Problems solved by technology

[0023] However, in this case, there is a high possibility that the amount of heat transferred into the storage tank 20 from the outside increases, thereby degrading the thermal insulation performance of the storage tank 20 while generating a large amount of evaporation in the storage tank 20 gas

[0024] On the other hand, if the thickness of the metal plate used for the support 25 is reduced, or the number of connection points between the support 25 and the inner wall 21 of the hull is reduced to enhance the thermal insulation performance of the storage tank 20, then the anti-sloshing tank The connection point between the wall 23 and the support 25 or between the support 25 and the inner wall 21 of the hull can be damaged by sloshing impacts

[0025] In addition, the standoffs 25 provide discontinuous points on the primary and secondary barriers of the tank 20 that could cause damage to the primary and secondary barriers due to thermal contraction or expansion of the tank 20

[0026] In addition, since the anti-sloshing bulkhead 23 is a bulkhead-shaped thin structure, it cannot support the load from the upper deck of the marine structure.

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