Analysis of Failure Caused by In-serviceWelding in anX52 Gas Pipeline

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FARZADI A.; SANAEI S.

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Journal Paper

Paper Information

Journal: JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN Year:2018 | Volume:3 | Issue:2 Page(s): 9-19

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Information Journal Paper

Title

Analysis of Failure Caused by In-serviceWelding in anX52 Gas Pipeline

Author(s)

FARZADI A. | SANAEI S. | Issue Writer Certificate

Keywords

Toe crack

Hydrogen-assisted cracking

Metallurgical failure analysis

Branch connection reinforcement

Joule-Thomson effect

“Live”welding

Operating conditions

Abstract

In the research presented in this paper, a failure analysis were carried out to identify causes of an incident, which had taken place after an operation to repair a leak in an interstate natural gas pipeline. In this operation, a partial encirclement reinforcement (patch) was welded to the carrier pipe according to an available hot taping procedure, while gas was flowing in the pipeline. The failure analysis commenced with preliminary steps of gathering of background data regarding the repair operation and then several samples were extracted for macroscopic and microscopic metallurgical examinations. In addition to fractographic analyses of fracture surfaces, pipe material was examined because the pipeline had been in service for prolonged period and there was not any official material information available. The analyses disclosed that Hydrogen-assisted cracking, wrong design of branch connection, paint coating and pipeline Operating conditions were major factors contributing to the failure.

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APA: Copy

FARZADI, A., & SANAEI, S.. (2018). Analysis of Failure Caused by In-serviceWelding in anX52 Gas Pipeline. JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN, 3(2 ), 9-19. SID. https://sid.ir/paper/269212/en

Vancouver: Copy

FARZADI A., SANAEI S.. Analysis of Failure Caused by In-serviceWelding in anX52 Gas Pipeline. JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN[Internet]. 2018;3(2 ):9-19. Available from: https://sid.ir/paper/269212/en

IEEE: Copy

A. FARZADI, and S. SANAEI, “Analysis of Failure Caused by In-serviceWelding in anX52 Gas Pipeline,” JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN, vol. 3, no. 2 , pp. 9–19, 2018, [Online]. Available: https://sid.ir/paper/269212/en

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