Pump tower installation structure of liquefied natural gas storage tank and manufacturing method thereof

A pump tower installation structure of a liquefied natural gas (LNG) storage tank, comprising:

• an adaptor disposed at a stern side of an opening portion formed at an inner hull disposed on an upper side of the LNG storage tank;
• a cover having through-holes corresponding to pipes of the pump tower installed at the storage tank, and disposed at a remaining area of the opening portion to be connected with the adaptor;
• a cover insulation board disposed under the cover;
• a lower insulation board disposed under the inner hull at the stern side;
• an insulation layer disposed under the adaptor;
• a vertical closing portion vertically installed under the adaptor to be in contact with the insulation layer;
• and
• an adjustment closing portion fixedly installed at the vertical closing portion to be disposed on the same plane with the lower insulation board;
• wherein the insulation layer is provided between the cover insulation board and the lower insulation board, and
• the lower insulation board is provided at the corner of the storage tank under the inner hull, and extends to a predetermined range under the adaptor.