Stray Current
Stray current is current from an external source - commonly DC transit systems, welding operations, or other cathodically protected structures nearby - that enters a pipeline at one point and discharges at another, and at the discharge point it can cause corrosion far more rapidly than natural electrochemical corrosion alone. Stray current interference is notoriously difficult to diagnose from static readings because it varies with the external source’s operating pattern, which is part of why continuous or frequent monitoring is more effective at catching it than infrequent manual surveys taken at arbitrary times.
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