Construction method of low-temperature tank and the low-temperature tank.

摘要

PROBLEM TO BE SOLVED: To keep the airtightness of a low-temperature tank even when a material not having high fracture toughness value in a low-temperature environment is used for a roof frame in the low-temperature tank.;SOLUTION: A welded part 23 joining adjacent roof plates 21 and roof frame 22 with each other is formed of a forming material whose toughness value for crack propagation stop during storage of liquefied gas is higher than a crack extension force in the roof frame 22, and the roof frame 22 is formed of a forming material whose fracture toughness value during storage of liquefied gas is lower than that of the forming material of the roof plate 21.;COPYRIGHT: (C)2013,JPO&INPIT