ON-THE-OCEAN HIGH-PRESSURE GAS PIPEWORK STRUCTURE

摘要

Provided is an on-the-ocean high-pressure gas pipework structure in which an excessive specification of temperature conditions is modified and optimized and the reduction of pipework weight and the improvement of constructability can be obtained. The on-the-ocean high-pressure gas pipework structure is placed in a floating facility equipped with a device for liquefying a gas and/or re-gasifying a liquefied gas and deals with a gasified gas. In the on-the-ocean high-pressure gas pipework structure, a two-phase stainless steel material is used as a pipework material of an on-the-ocean high-pressure natural gas pipework (14) and a multi-layer welding in which after a TIG welding layer (21) is formed as a first layer, a carbon dioxide gas arc welding layer (22) and the TIG welding layer (21) are alternately formed is performed at a welding portion (20) of the pipework material.