When the protective coating on steel water and gas pipelines starts to deteriorate, corrosion isn’t far behind. But trying to locate those corrosion-prone areas with a transmitted current can frustrate technicians, as interference, congestion, and the presence of other metallic structures underground complicate the process.The latest Pipeline Current Mapper, or PCM+, from Radiodetection Ltd., overcomes that problem with an accurate unit that integrates location and mapping technology, says Peter Mann, pipeline products specialist.The system is comprised of a transmitter and a handheld receiver. While the transmitter applies a 4 Hz AC test signal to the pipe, the receiver uses advanced
