Gazprom Transgaz Samara Ltd. (Samara, Russia)¹ ; Samara National Research University named after Academician S. P. Korolev (Samara, Russia)²:

D. V. Zhukov, Head of the Database Support Group¹, Post-Graduate Student, Dept. of Metal Technology and Aviation Materials Science²

Samara National Research University named after Academician S. P. Korolev (Samara, Russia):
A. A. Melnikov, Cand. Eng., Associate Prof., Dept. Materials Science
S. V. Konovalov, Dr. Eng. Prof., Head of the Dept. of Metal Technology and Aviation Materials Science, e-mail: ksv@ssau.ru
A. V. Afanasyev, Cand. Eng., Junior Researcher, Dept. Aviation Materials Science

The analysis of the internal defect of the 426 mm diameter pipe of a compressor station process piping was carried out. The pipeline section has been in operation for 37 years. The defect was detected visually during the repair of the section with cutting out a part of the pipe being inspected for the installation of shut-off valves. When preparing the section for the tie-in, a delamination with a visible length of 30 mm was found at the end of the pipe. According to external signs, the defect has a production reason for the formation. The pipe section with the defect must be replaced in accordance with GOST ISO 10893-8–2017. Extended non-destructive testing and metallographic examination of the defective area were carried out. The dynamics of changes in the requirements of normative and technical documents for the assessment of defects of this type is considered. Finite element modeling of mechanical hoop stresses in the pipe has been carried out to determine the degree of danger of such defects. The actual configuration of the defect, determined by microscopy, and theoretical models, built according to the data of step-by-step thickness measurement, are implemented as models.

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