This paper details a comprehensive AC interference analysis and implementation of an extensive AC corrosion mitigation and monitoring system for a 100-mile (328 kilometer) portion of a regulated pipeline. The pipeline is collocated with multiple high voltage overhead AC power lines and countless adjacent pipelines with cathodic protection. It is routed through extensive swamplands and agricultural tracts in highly conductive soils. The field analyses, computer modeling to aid in designing the AC mitigation plan, challenges associated with the phased installation of the mitigation system, and operational performance data are discussed. The threat of AC corrosion was minimized through a combination of parallel mitigation conductors, deep vertical grounds, optimization of the pipeline cathodic protection level to reduce its effect on the AC interference, and remote surveillance of multiple electrical resistance type corrosion rate probes.
Key words: Conference papers, 2017 conference papers, AC interference, mitigation, current density, AC corrosion, electrical resistance corrosion rate probe, cathodic protection, remote monitoring unit.