Obtaining accurate polarized potentials (a.k.a. Instant-OFF potential) during an interrupted survey can be complicated by the introduction of a capacitance effect from DC decouplers in the circuit. Methods to obtain accurate polarized potentials in these scenarios exist, but there is some level of risk introduced to the pipeline and operating personnel. This paper will explain these existing methods, evaluate the level of risk associated with each and analyze a new technology that was developed for the purpose of improving data by providing accurate polarized potentials and avoids the risks or inaccuracies that other methods introduce. Field data will be presented to represent the performance of the new technology and compare it to having traditional decouplers in place.

The new technology reduces the time required for decoupler voltage to dissipate without having to disconnect the decouplers during an interrupted survey.

Subject
Electric current, Circuits, Piping, Voltage, Capacitors, Pipelines, Potential measurements, Capacitance, Cathodic protection survey, Corrosion protection, Surveys, Polarized potential, Instant off potential
Keywords:
Close Interval Survey, CIS, Instant-Off Potential, Decoupler, Capacitance
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2022
Association for Materials Protection and Performance (AMPP)
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