Recently, China Oil and Gas Pipeline Engineering Technology Research Center Co., Ltd. successfully completed the first full-scale expansion test of high-grade steel spiral welded pipes in China. Three spiral welded pipes of φ1219×22mm and X80 steel grade were used in the experiment. According to different expansion rates, grouped batch expansion tests were carried out on the whole pipe length. After more than half year of preparatory work, from the preliminary investigation to the formulation of the experimental plan, the experiment has been successfully completed. This test fills the gap in the research on the expansion of the whole body of the large-diameter and high-grade steel spiral welded pipe in China, and has achieved the expected results.

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