| Summary: | The line pipes with large diameter, thick wall and high steel grade are preferred to meet the requirements of extremely high gas transmission rate (380 × 108 m3/a) in the Sino–Russian eastern route project. In this paper, the technical standards of line pipes at home and abroad were comparatively analyzed after the research and formulation process of technical specifications of X80 line pipes (OD 1422 mm) used in the above-mentioned project was introduced. The key technical indexes such as chemical components, crack–arrest-toughness values, etc. and its formulation process were discussed. In addition, the development process and product performance of the X80 line pipes (OD 1422 mm) were described. It is proved by trial production and product tests that using X80 line pipes (OD 1422 mm) in this gas project is a rational and effective solution to the following technical issues such as chemical composition control, fracture control and welding stability maintenance. This type of line pipes is proved not only to meet project requirements, but to suit for production cases. As a result, the safety of Sino–Russian eastern route gas pipeline will be guaranteed essentially. The research results in this paper provide a strong technical support for the application of X80 line pipes (OD 1422 mm) in the Sino–Russian eastern route project, and play a guiding role in drawing up the technical specifications of other gas pipeline projects.
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