Heat insulating material for liquefied natural gas tank, its construction method and liquefied natural gas tank

摘要

Problem to be solved: cracking and peeling are suppressed even in the case of remarkable heat shrinkage in the steel plate of the liquefied natural gas tank, and the generation of Boyle off gas (bog) and the Boyle off rate (BOR) can be sufficiently suppressed, and the manufacturing cost is reduced, excellent in the upper surface of the environment, and excellent in workability. Provide an insulating material for a liquefied natural gas tank.Solution: the heat insulating material 20 is provided on the outer surface of the tank steel plate 121 of the liquefied natural gas tank, and the heat insulating material 20 includes layers 21 and 23 made of a resin foam and a layer 22 made of a vacuum insulation material, and the heat insulating material is the resin foams toward the outside from the tank steel side An insulating material for a liquefied natural gas tank with a density gradient reducing the density of the layer.Diagram