The technology available for monitoring induced alternating current (AC) levels and additional corrosion risk factors for AC corrosion risk has continuously evolved along with the recognition of AC as a significant factor in pipeline corrosion. This paper covers the current state of the art regarding monitoring AC levels and AC corrosion risk on buried structures as well as monitoring the effectiveness of AC mitigation deployed to alleviate the risk of corrosion due to AC interference. Significant topics include induced AC interference, AC and DC current density factors, AC voltage for safe touch and as the driving force for elevated current density, and AC drain to ground and grounding efficiency. Cost-effective and best practices monitoring strategies are discussed as well as the value of continual assessment of AC and DC values relating to ongoing corrosion risk.

Subject
Voltage, Cathodic protection, Corrosion rate, Structures, Pipelines, Grounding, Metal loss, Density, Current densities, Alternating current corrosion, Risk management, AC interference, Electrical resistance probes
Keywords:
Alternating current interference, current density, electrical grounding, compliance measurements
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2023
Association for Materials Protection and Performance (AMPP)
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