STRUCTURE FOR TANK DOME FLANGE SECTION

摘要

The present invention can suppress a temperature increase of a low-temperature liquefied gas stored in a tank main body portion. A tank dome flange portion structure (21) is provided at a liquefied gas tank and includes: a tank main body portion configured to store a low-temperature liquefied gas; a tank dome (3) provided at an upper portion of the tank main body portion; a flange portion (22) projecting substantially horizontally from the tank dome (3); a tank cover (6) configured to cover the tank main body portion with a space (5) therebetween; and an expansion rubber portion (11) provided between the flange portion (22) and an upper opening edge portion of the tank cover (6) and configured to seal the space (5). A heat transfer suppressing material portion made of fiber reinforced plastic is provided at at least a predetermined portion of the flange portion (22), the predetermined portion being located between a side wall (3a) of the tank dome (3) and the expansion rubber portion (11).