Stray current corrosion is an external damage mechanism that might pose a threat to integrity of buried pipelines. This type of external damage mechanism typically occurs when a current from nearby cathodic anode bed takes an unintended path and either initiates or accelerates existing external corrosion processes. The objective of this paper is to present a case study wherein severe external metal loss occurred on a major crude pipeline in a relatively short time due to stray current corrosion. The paper will also discuss the robust integrity management plan that allowed the external corrosion to be identified in a timely manner, the active steps taken to restore the integrity of the pipeline, and actions implemented to mitigate further external corrosion from occurring.

Subject
Risk based inspection, Cathodic protection, Corrosion rate, Tape, Inline inspection, Stray current interference, Pipelines, Metal loss, Shielding, Stray current, External corrosion, Coating systems, Stray current corrosion
Keywords:
Corrosion, Stray-Current, Pipeline, Cathodic Protection, CP Shielding, ILI
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2023
Association for Materials Protection and Performance (AMPP)
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