PCM is a technique designed for surveying pipelines. PCM is used to locate pipelines, identify individual defects in pipeline coatings, and provide information on the integrity and variation of the coating on new pipelines, and condition of existing pipelines in operation.
PCM works by applying a ‘signal’ of a very low frequency alternating current (AC) to the pipeline with the PCM Transmitter. This signal ‘escapes’ from the pipeline where there are defects in the coating, and can be identified from above the ground using a ‘magnetometer’. The PCM Receiver also provides a measurement of depth, current magnitude and direction of the signal as applied by the PCM transmitter. An ‘A-Frame’ attachment enables pinpointing of coating faults.
PCM can be used to locate and measure the corrosion in the pipeline along its CPS (Cathodic Protection System). The PCM can also be linked to GIS mapping as well as GPS co-ordinates.