The invention relates to a corner structure (16) for a leaktight and thermally insulating tank for storing a fluid, comprising a plurality of walls (1, 101, 201); the said corner structure (16) being intended to be arranged in a corner between a first wall (101) and a second wall (201) and comprising: a first angle bracket (32) anchored to an anchoring device (16) intended to be fastened to the supporting structure (3) of the first and second walls (101, 201); the anchoring device (16) comprising a first tab (18) and a second tab (19) intersecting one another, each of the first and second tabs (18, 19) comprising an external portion (24, 25) and an internal portion (22, 23) which are arranged on either side of an intersection between the first tab (18) and the second tab (19); the corner structure (16) furthermore comprising a first insulating panel (42) which is arranged in a first space delimited by the internal portion (22) of the first tab (18) and the external portion (25) of the second tab (19), and a first lateral insulating packing element (48) which is compressed between the first insulating panel (42) and the external portion (25) of the second tab (19).

The invention concerns a sealed tank including adjacent first and second walls each comprising a corrugated sealing membrane; the sealing membranes of the first and second walls join at the level of an edge;

the sealing membrane of the first wall including a first series of corrugations and a second series of corrugations intersecting at the edge;
the sealing membrane of the second wall including a third series of corrugations intersecting at the edge;
the tank further including a corner arrangement comprising a sealing membrane that is welded in sealed manner to the sealing membrane of the first wall and to the sealing membrane of the second wall and is such that the corrugations of the first series of corrugations are connected to corrugations of the third series of corrugations and the corrugations of the second series of corrugations are connected to the corrugations of the third series of corrugations.

The invention relates to a method for detection of a leak from a tank for liquid gas, said tank comprising a membrane surrounding the liquid gas, the membrane being surrounded by an insulation space which separates the membrane from a wall, the insulation space being filled an inert gas which is injected and extracted by at least one duct. The detection method comprises the following steps: determining 921 a first variation of mass of inert gas ΔM1 between two moments by measuring the gas added and removed by the duct; calculating 922 a second variation of mass of inert gas ΔM2 corresponding to a difference between two masses of inert gas measured in the insulation space; and comparing 931 the first variation with the second variation, and triggering an alarm if a difference E1 between the first variation and the second variation of mass of inert gas is greater than a first threshold S1.

The invention concerns a sealed and thermally insulating vessel for storing a fluid, comprising a secondary thermal insulation barrier and a secondary sealing membrane, the secondary sealing membrane comprising a plurality of corrugated metal sheets sealingly welded to each other and each comprising at least two perpendicular corrugations, the secondary thermal insulation barrier comprising a plurality of juxtaposed insulating panels, each insulating panel having an inner face, opposite the bearing wall, provided with metal plates to which the corrugated metal sheets are welded, each insulating panel being associated with the adjacent insulating panels via a plurality of bridging elements.

Provided is a liquefied gas treatment system for a vessel, which includes a cargo tank storing liquefied natural gas (LNG), and an engine using the LNG as fuel. The liquefied gas treatment system includes: a compressor line configured to compress boil-off gas (BOG) generated in the cargo tank by a compressor and supply the compressed BOG to the engine as fuel; a high pressure pump line configured to compress the LNG stored in the cargo tank by a pump and supply the compressed LNG to the engine as fuel; and a heat exchanger configured to liquefy a part of BOG, which is compressed by the compressor, by exchanging heat with BOG that is discharged from the cargo tank and transferred to the compressor.

A vacuum heat-insulating material includes: an outer cover material; and a core material which is sealed in a tightly closed and decompressed state on the inside of the outer cover material. Outer cover material has gas barrier properties and satisfies at least one of a condition that a linear expansion coefficient is 80×10.sup.−5/° C. or lower when a static load is 0.05 N within a temperature range of −130° C. to 80° C., inclusive, a condition that an average value of a linear expansion coefficient is 65×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −130° C., inclusive, a condition that an average value of a linear expansion coefficient is 20×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −110° C., inclusive, and a condition that an average value of a linear expansion coefficient is 13×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of +50° C. to +65° C., inclusive.

A method for checking the sealing of a sealed tank for storing a liquefied gas at low temperature, the tank having an inner hull and a secondary sealing membrane, a secondary space that is arranged between the inner hull and the secondary sealing membrane, a primary sealing membrane and a primary space that is arranged between the primary sealing membrane and the secondary sealing membrane is disclosed. The method has the following main steps: generating a pressure lower than the pressure of the primary space in the secondary space using a suction device, measuring the temperature of an outer surface of the inner hull, and detecting the location of a sealing defect of the secondary sealing membrane in the form of a cold spot on the outer surface of the inner hull.

A corner structure comprises: a fixed member fixed to a corner of a storage tank; a movable member supported on the fixed member so as to be linearly movable; a stop member attached to the fixed member to prevent the movable member from being detached from the fixed member; and a heat insulating member disposed between a sealing wall and a hull. The fixed member comprises a guide portion provided with a guide recessed portion, the movable member comprises a guide protruding portion inserted into the guide recessed portion, and the width and the length of the guide protruding portion are smaller than the width and the length of the guide recessed portion, so that the movable member can be supported on the fixed member to be movable in the longitudinal direction and in the direction perpendicular to the longitudinal direction.

The invention relates to an installation for storing and transporting a liquefied gas, having a sealed pipe (7) that passes through the tank wall so as to define a fluid passage between the inside and the outside of the tank, a sealed metal sheath (29) that is disposed around the sealed pipe (7) and fitted in the opening (22) in the load-bearing wall, the sealed sheath having a longitudinal portion extending at least as far as the sealing membrane (14), the sealing membrane being joined to the sealed sheath (29) in a sealed manner, wherein the load-bearing structure comprises a coaming (24) that protrudes from an outer surface of the load-bearing wall, the sealed pipe being supported by a top wall (26) of the coaming, the sealed sheath (29) having an outer end that is disposed outside the load-bearing wall and attached to the coaming or to the sealed pipe (7) all around the sealed pipe.

Disclosed is a heat-insulation system for a liquefied natural gas cargo hold, which comprises a primary sealing wall, a secondary sealing wall, and a secondary heat-insulating layer, and is applied to a liquefied natural gas cargo hold. The heat-insulation system for a liquefied natural gas cargo hold comprises a collar stud installed on a line on the upper surface of the secondary heat-insulating layer where an anchor strip is installed.