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Numerical simulation was used to calculate the potential and current distribution for cases with: (1) electrical isolation between grounding system and CP system; (2) different electrical grounding materials; (3) Optimization of anode beds (near/remote); (4) isolation of partial grounding electrodes.
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Corrosion risk due to AC interference has been known to be a possibility for decades but really came to the awareness of pipeline industry professionals starting around 2000 to 2004. Prior to that time there were some lab simulations as well as some suspected incidents in actual field situations, but many in the industry resisted accepting this as a real risk even as late as 2012 or later. Part of the reluctance to view AC interference as a genuine corrosion risk was that corrosion directly attributed to AC interference had not really been seen in the century of buried pipeline management, as well as a lack of understanding as to how this interference produced or accelerated corrosion on the pipeline.
Design, construction, operation, and maintenance of metallic structures and corrosion control systems used to mitigate the effect of lightning and overhead alternating current (AC) power transmission systems.
High-voltage electrical inspection of pipeline coatings. Guidelines on testing voltages, grounding, exploring electrodes, speed of travel, voltage measurements, surface condition, care of equipment.