Pipeline Current Mapping (PCM) Survey: Pipeline Current Mapping (PCM) Survey Cathodic Protection (CP) is applied to buried steel pipelines to complement the protection provided by pipe coating

Pipeline Current Mapping (PCM) Survey is a non-destructive testing method used to identify and map pipeline currents. It works by injecting a small current into the pipeline and measuring the resulting electrical potential distribution along the pipeline. This can help identify areas where current is being lost and where potential corrosion may be occurring. PCM survey can also be used to detect and locate coating defects and other anomalies that can contribute to pipeline corrosion. By identifying areas of concern, PCM survey can help prevent pipeline failure and extend the life of the pipeline.

The PCM has been designed to overcome the shortcomings of the existing techniques and now provides pipeline engineers with an accurate, cost-effective product that can be used in all weather and ground conditions. An extremely low, “near dc” frequency (4 Hz) is used to mirror as closely as possible the DC generated by the cathodic protection. It also avoids signal losses caused by capacitance so nearly all the signal loss is due to coating faults or shorts to other structures.

ACVG (Alternating Current Voltage Gradient) Survey is a non-destructive testing technique used to detect coating defects and corrosion on conductive pipelines. It operates by applying an alternating current to the pipeline and measuring the resulting voltage gradient. The presence of a coating defect or corrosion causes a change in the voltage gradient, which can then be analyzed to determine the location and extent of the defect or corrosion. ACVG survey can help identify areas of concern and allow for proactive maintenance to extend the life of the pipeline.

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