Stray currents influence pipeline corrosion monitoring, mitigation

European field monitoring programs and subsequent laboratory investigations have shown that excessive cathodic protection (CP), combined with induced AC, enhances the risk of corrosion. Increasing the CP level is therefore not advisable as a countermeasure to corrosion for pipelines with AC.Updates of European guidelines and standards are now in progress, and the National Association of Corrosion Engineers (NACE) has formed a task group (TG 327), whose ultimate goal is to develop a recommended practice on AC corrosion control. The immediate goal of the group is to produce a state-of-the-art report on the subject. Paralleling buried pipelines with high-voltage power lines induces AC on th...

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