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.

Abstract: Disclosed is a liquefied gas processing system for a ship that includes a storage tank that stores liquefied natural gas, and an engine that uses the liquefied natural gas stored in the storage tank as fuel. The liquefied gas processing system of the present invention comprises: a storage tank that stores liquefied gas; an engine that uses the liquefied gas stored in the storage tank as fuel; and a fuel supply line that can vaporize the liquefied gas and supply the generated gas to the engine as fuel. The engine receives a supply of the fuel gas that is pressurized at a low pressure.

Abstract: A method and apparatus for processing natural gas composed of various hydrocarbon components for transportation of the natural gas to a demand side without separation of the hydrocarbon components, such that the natural gas can be used by consumers after being separated into the hydrocarbon components according to the needs of the demand side. The apparatus includes a storage tank and a hydrocarbon liquefied gas mixture accommodated in the storage tank. The mixture has hydrocarbon components composed of methane, ethane, propane and butane, and is produced by liquefying raw natural gas without changing the relative ratio of methane, ethane, propane and butane in the raw natural gas immediately after extraction from the gas well. The method and apparatus can be applied to floating marine structures.

Abstract: Disclosed is a method and apparatus for adjusting heating value of natural gas, wherein components having high heating value are separated from natural gas consisting of various hydrocarbon components to reduce heating value of natural gas supplied to the markets. The method includes heating liquefied natural gas (LNG), separating the LNG heated and partially gasified into a gaseous component having low heating value and a liquid component having high heating value.

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.