English

Vol. 10 6, 2020 p 586-598

Pages

Article name, authors, abstract and keyword

586-598

Failure analysis of pipeline on-site manufacturing details

Dmitry A. Neganov a, Eugeny P. Studenov a, Sergey V. Skorodumov a, Oleg A. Kozyrev a

a Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a Sevastopolsky Prospect, Moscow, 117186, Russian Federation

DOI: 10.28999/2541-9595-2020-10-6-586-598

Abstract: About 4 % of the connecting pieces used in the construction of oil pipelines in the 1950s1970s were manufactured in the field. Despite the fact that in recent years the number of such parts has significantly reduced, failures associated with their lack of reliability occupy a noticeable share in the total number of failures in the system of oil trunk pipelines. The purpose of this work is to analyze the typical causes of failure of connecting parts using the example of a tee bend with a reinforcing plate. The authors carried out structural and fractographic studies of the defective structure. On the basis of information about the operating conditions and the actual characteristics of the bend metal, as well as data on the centers of destruction and the nature of crack propagation, computer modeling of the stress-strain state of the part was carried out. Based on the results of metallurgical studies and computer modeling, it was established that the cause of the formation of a through crack in the weld at the junction of the main oil pipeline and the reserve branch was excess stresses in the area of welding of the reinforcing plate to the branch, exceeding the tensile strength of the material of the tee branch pipe.

Keywords: fitting, failure analysis, on-site manufacturing details, main pipeline.

For citation:
Neganov D. A., Studenov E. P., Skorodumov S. V., Kozyrev O. A. Failure analysis of pipeline on-site manufacturing details. Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktovScience & Technologies: Oil and Oil Products Pipeline Transportation. 2020;10(6):586598.

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