A comprehensive metallurgical investigation of multiple, externally-initiated, in-service leaks on an above-ground, oil emulsion (multiphase) pipeline concluded that the crack-initiating mechanism was stress corrosion cracking (SCC). A technical root cause analysis (RCA) was performed, utilizing faults trees, to evaluate the potential contributors to the SCC from the time of construction through the identification of the first in-service leak. This paper outlines the RCA findings and current understating of the primary contributors given that SCC on above-ground, insulated carbon steel pipelines has not previously been reported.
Root Cause Analysis of an Above-Ground Pipeline With Stress Corrosion Cracking
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Ralston, KD, Padgett, BN, Norfleet, DM, Cao, L, Delanty, BS, Klages, MB, Beavers, JA, & Prewitt, TJ. "Root Cause Analysis of an Above-Ground Pipeline With Stress Corrosion Cracking." Proceedings of the 2018 12th International Pipeline Conference. Volume 1: Pipeline and Facilities Integrity. Calgary, Alberta, Canada. September 24–28, 2018. V001T03A041. ASME. https://doi.org/10.1115/IPC2018-78544
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