Patent ID: 7938287

Claim:
A liquefied natural gas (LNG) storage tank, for storing a liquefied natural gas comprising: a heat insulating wall disposed on an inner surface of the LNG storage tank to form a heat insulating layer; sealing walls disposed on the heat insulating wall to contact the LNG; and a structure to support the sealing walls, wherein the structure comprises a corner structure disposed at a corner of the storage tank to support the sealing walls, and wherein the corner structure comprises a corner member connected between the sealing walls and the inner surface of the storage tank to secure the sealing wall to the inner surface thereof, and a heat-insulating material formed around the corner member, the corner member comprising a fixed member secured to the inner surface of the corner of the storage tank, and a movable member supported on the fixed member to move linearly on the fixed member, wherein the corner member further comprises a connection member to connect and secure the movable member to the inner surface of the corner of the storage tank, wherein the fixed member and the connection member of the corner member are coupled at a plurality of locations to the inner surface of the corner of the storage tank, wherein the movable member of the corner member comprises a junction part to which the sealing walls are joined, the junction part comprising a first junction part and a second junction part stepped to have a predetermined height difference, wherein the fixed member comprises a guide recess and the movable member comprises a guide protrusion, the movable member being linearly moved on the fixed member by the guide recess and the guide protrusion.