Insulation system for floating marine structure

Abstract

Disclosed herein is a heat insulating system of a floating structure, and more particularly, a heat insulating system of a floating structure in which a heat insulating material is provided at at least one of a ballast tank, a trunk deck space, and a side passage way contacting the trunk deck to decrease a boil-off rate (BOR) occurring due to a heat transfer from an external region of a hull into an LNG storage tank.

1 . A heat insulating system of a floating structure, wherein a heat insulating material is provided at at least one of a ballast tank, a trunk deck space, and a side passage way contacting a trunk deck to decrease a boil-off rate (BOR) generated due to a heat transfer from an external region of a hull into an LNG storage tank. 
     
     
         2 . The heat insulating system of a floating structure of  claim 1 , wherein a temperature of an internal hull contacting at least one of the ballast tank, the trunk deck space, and the side passage way contacting the trunk deck is controlled to be −55 to 30° C. 
     
     
         3 . The heat insulating system of a floating structure of  claim 2 , wherein the temperature of the internal hull contacting the ballast tank is controlled to be 0 to 20° C. and the internal hull is made of steel grade A defined in IGC. 
     
     
         4 . The heat insulating system of a floating structure of  claim 2 , wherein the temperature of the internal hull contacting at least any one of the trunk deck space and the side passage way contacting the trunk deck is controlled to be 0 to 30° C. and the internal hull is made of the steel grade A defined in the IGC. 
     
     
         5 . The heat insulating system of a floating structure of  claim 2 , wherein the temperature of the internal hull contacting at least any one of the trunk deck space and the side passage way contacting the trunk deck is controlled to be −30° C. or less and the internal hull is made of low temperature steel LT. 
     
     
         6 . The heat insulating system of a floating structure of  claim 1 , wherein the heat insulating material is provided on an inside wall of an external hull forming the ballast tank. 
     
     
         7 . The heat insulating system of a floating structure of  claim 1 , wherein the heat insulating material is provided in a region in which the side passage way close to the trunk deck space contacts the ballast tank. 
     
     
         8 . The heat insulating system of a floating structure of  claim 1 , wherein the heat insulating material includes at least one of the heat insulating wall heat-insulating LNG stored in the LNG storage tank, a panel type heat insulating material, a foam type heat insulating material, a vacuum type heat insulating material, a particle type heat insulating material, and a non-woven fabrics type heat insulating material. 
     
     
         9 . The heat insulating system of a floating structure of  claim 2 , further comprising:
 a heater heating the internal hull.   
     
     
         10 . The heat insulating system of a floating structure of  claim 7 , wherein the heater uses at least of a glycol heating coil, an electric heating coil, and a fluid pipe to heat the internal hull. 
     
     
         11 . The heat insulating system of a floating structure of  claim 1 , wherein the floating structure is any one selected from an LNG FPSO, an LNG FSRU, an LNG carrier, and an LNG RV. 
     
     
         12 . A heat insulating system of a floating structure, comprising:
 a cofferdam provided between a plurality of LNG storage tanks installed in at least one row in a length direction of a hull; and   a heat insulating material provided in a ballast tank, a trunk deck space, and a side passage way contacting a trunk deck,   wherein the cofferdam is controlled to be a temperature of 0° C. or less to decrease a heat transfer from the cofferdam into the plurality of LNG storage tanks and controls a temperature of at least one of the ballast tank, the trunk deck space, and the side passage way contacting the trunk deck to be lower than a temperature of an external hull to decrease a boil-off rate (BOR) generated due to the heat transfer from at least one of the ballast tank, the trunk deck space, and the side passage way contacting the trunk deck into the plurality of LNG storage tanks.   
     
     
         13 . The heat insulating system of a floating structure of  claim 12 , wherein the cofferdam includes:
 a pair of bulk heads spaced apart from each other between the plurality of LNG storage tanks; and   a space portion provided by the pair of bulk heads and an inner wall of the hull, and   the cofferdam controls the pair of bulk heads to be temperature below 0° C.   
     
     
         14 . A heat insulating system of a floating structure, wherein a temperature of an internal hull contacting at least one of a ballast tank, a trunk deck space, and the side passage way contacting a trunk deck is controlled to be −55 to 30° C.