An in-line integrity inspection revealed unusual, yet substantial top of line corrosion in a low flow, moderately corrosive wet gas pipeline, despite apparently successful bottom-of-line corrosion control. Following the in-line inspection a root-cause corrosion investigation was conducted, including further detailed analysis of the inline inspection data, a failure analysis of pipeline cut-out samples, and a corrosion modeling assessment using an in-house corrosion prediction tool. The corrosion modeling prediction, which provided a reasonable interpretation of where and why corrosion occurred, proved to be a major element in identifying the cause of the corrosion. Also, the corrosion modeling was key to identifying needed performance improvements for the pipeline corrosion control.

Subject
Modeling, Corrosion rate, Slug flow, Pipelines, Inspection, Failure analysis, Terrain, Corrosion attacks, Corrosion modeling, Bacteria, Corrosion inhibitors, Carbon dioxide, Corrosion protection
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2009
Association for Materials Protection and Performance (AMPP)
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