Use this audit protocol to verify the electrical isolation of steel pipeline casings in line with MG AP CP3.031. The checklist guides crews through spot potential measurements, anode disconnection, and ON OFF readings with a current interrupter at the nearest cathodic protection unit. It prompts checks for casing to pipe potential differences at 200 mV and 5 mV thresholds, procedures to confirm isolation or identify shorts, and steps to calculate, record, and report the location of any short for excavation and repair. Final sections cover reconnection of anodes, site cleanup, safety, and sign off.
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