Abstract
The representative materials, used in Russian Yamal LNG project, are ASTM A333 Gr.6 (low temperature carbon steel, designed temperature of –50°C) and ASTM A312/A358 TP304/304L (austenitic stainless steel, designed temperature of –196°C). The welding technical specification demands TIG (Tungsten Inert Gas) welding for root welding of piping. This project adopts the construction way of prefabrication in Qingdao and assembly in Russian. Therefore, high construction accuracy is required. This article introduces the LNG process piping welding by automatic TIG welding which contains welding process design, welding process parameters, test and analysis of weld mechanical property and advantage analysis of TIG welding as well. In this project, the automatic and high efficient TIG welding is used for the root welding and hot welding of low temperature carbon steel and austenitic stainless steel piping. The result shows that the mechanical properties of weld metals meet the requirements of LNG project technical specification and code ASME B31.3. The efficiency of automatic TIG welding increases 2 times compared with conventional manual TIG welding. The automatic TIG welding improves and optimizes the quality and construction progress of the LNG project process piping.
Highlights
China National Petroleum Offshore Engineering CO., LTD contracts Russian Yamal LNG project
The engineering volume of Yamal project divides into 169 modules which consist of 50,000 tons steel structure and 190,000 m process piping
TP304/304L is used in the welding procedure qualification of austenitic stainless steel piping
Summary
China National Petroleum Offshore Engineering CO., LTD contracts Russian Yamal LNG project. The Project is based on the Yamal Peninsula, above the Arctic Circle, and utilizes the resources of the South Tambey Field. This natural gas liquefaction plant has usually been frozen for nine months a year with the minimum temperature as low as -50°C. The manual TIG welding is usually used for root pass and hot pass of conventional LNG process piping. This method is low efficient and needs good skilled welders. To improve the efficiency and quality of root pass and hot pass welding, the construction of process piping divides to two parts (prefabrication in workshop and installation in construction site). Zhijian Wang et al.: Application of Automatic TIG Welding for Yamal LNG Process Piping Fabrication
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