Pressure accumulator

A pressure accumulator that causes a liquefied gas at a very low temperature that has been injected into the pressure accumulator from an outside through a pipe to vaporize and stores the liquefied gas, the pressure accumulator comprising:

• a cylindrical body made of metal and configured to vaporize and store the liquefied gas in a storage space in the cylindrical body;
• a lid body having a through hole that allows the pipe to penetrate through the through hole, the lid body being configured to fix the pipe passing through the through hole, and being configured to close an opening end portion of the cylindrical body with a gap provided between the lid body and an inner peripheral surface of the cylindrical body, the gap communicating with the storage space of the cylindrical body;
• a sealing structure portion provided between an outer peripheral portion of the lid body and an inner peripheral portion of the cylindrical body, the sealing structure portion being configured to fill in at least a portion of the gap;
• and
• a fixing part provided at the opening end portion of the cylindrical body, an outer peripheral surface of the fixing part being screw fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from an outer side of the lid body, wherein
• the lid body is provided entirely inward of the fixing part relative to an axial direction of the cylindrical body such that the fixing part and the lid body do not overlap along a radial direction of the cylindrical body, and
• the lid body includes
• an inner lid body made of austenitic stainless steel, and disposed at a position close to the storage space of the cylindrical body, and
• an outer lid body made of low alloy steel, and disposed at a position close to the fixing part.