Patent ID: 7717289

Claim:
A liquefied natural gas (LNG) storage tank, 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 LNG; and a structure to support the sealing walls, wherein the structure comprises an anchor structure including: an anchor member connected between the sealing walls and the inner surface of the storage tank to secure the sealing walls to the inner surface of the storage tank, and a heat-insulating material formed around the anchor member, the anchor member being coupled at a plurality of locations to the inner surface of the storage tank, wherein the sealing walls comprises a first sealing wall directly contacting the LNG and a second sealing wall spaced from the first sealing wall, wherein the anchor member comprises a frustoconical body having a closed top and an opened base, the opened base comprising a securing part connected to the inner surface of the storage tank, and the closed top comprising a first junction part and a second junction part wherein the first junction part is raised from the second junction part to have a predetermined height difference therebetween, and wherein the first sealing wall is welded to the first junction part and the second sealing wall is welded to the second junction part.