An alternative method to record the potential shift when performing a coating conductance test outlined in NACE TM0102-021 is proposed. This method utilizes an oscilloscope rather than a digital multimeter to capture the potential shift when performing the applied current method. This procedure was developed for short sections of bored pipeline where it was found that the potential shift and subsequent polarization decay occurred in a timeframe less than the digital multimeter could display. Results obtained for reported coating conductance values are compared with those recorded using a digital multimeter. Utilizing the oscilloscope proved to be an effective method for determining the potential shift of a short bored section of pipe where the rate of polarization decay posed an issue.

Subject
Electric current, Test methods, Voltage drops, Piping, Voltage, Pipe to soil potential, Pipelines, Grounding, Potential measurements, Electrical conductance, Electric potential, Instant off potential, Soil
Keywords:
bore, coating conductance, fall of potential test, horizontal directional drill, oscilloscope, polarization decay, potential measurement, reactance
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2017
Association for Materials Protection and Performance (AMPP)
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