United States Department of Transportation
i
Understanding and Mitigating the Threat of AC Induced Corrosion on Buried Pipelines
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2020-01-28
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[PDF-28.75 MB]
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Edition:Final Report
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Abstract:In this project we will explore new methods for assessing the threat of AC corrosion on buried pipelines. The results from this project will improve indirect inspection methods for assessing the impact of induced AC currents on pipeline corrosion rates and could be used for national and international standards. To accomplish this goal the project has three thrust areas: laboratory studies, industrial test facility benchmarking and in-service pipeline validation. Previous work in our lab has shown that the magnitude of interfacial capacitance of the corroding metal is a key parameter in determining AC corrosion rate. As such we will investigate the interfacial capacitance that develops on pipeline steel as a function of corrosion product build-up (scaling) and soil properties such as, resistivity, mineral content and pH. In addition, we will conduct exploratory studies determine the susceptibility of pipeline steel to environmental fracture during exposure to AC. Results from these tests will be benchmarked in experiments conducted in industrial pipeline testing facilities at Mears Integrity and Marathon Petroleum. Finally, we will validate the project by collecting indirect inspection data on an in service pipeline in a transmission line right-of-way owned by Marathon. These data will be used as input to an AC Risk Algorithm to prioritize direct inspection of the pipeline. If permissible, the section of the pipeline identified as being at the greatest risk will be assessed using direct inspection.
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