Oilfield Corrosion Coupons: After Exposure What Really Matters

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API (American Petroleum Institute) tracks and analyzes the cause of leaks / releases of hydrocarbons based on data reported to PHMSA (Pipeline and Hazardous Materials Safety Administration). One study took a statistical look at the causes of internal corrosion for onshore liquid pipelines. In a 10-year period, a total of 503 incidents were responsible for 53,000 barrels spilled and property damage of $188,000,000.

Product Number: 51323-19206-SG

Author: Sudhakar Mahajanam, Chris Miller, Krista Heidersbach, Jane Brown, Amilcar Oberto

Publication Date: 2023

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For liquid transportation pipelines, internal corrosion is rarely the primary failure mode. Corrosion coupons are one of the primary ways to get an indication of how corrosive the internal pipeline environment is and are an essential part of the toolbox that operators use to confirm if internal corrosion is occurring or can be controlled by chemical treatment. The previous version of the SP 0775 document had inadequate guidance on how to prevent oxidation between removal and analysis. Additionally, an informal survey showed that many other practices are currently used by practitioners.

Our aim for this project was to run a suite of exposure tests using different coupon handling techniques and examine the exposed surfaces at various time intervals, which could potentially help identify best practices on sample removal and preservation.