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A 2018 field investigation on an NPS 6, approximately 4 km long, liquid pipeline, identified a rectifier asthe likely source of the elevated DC and AC current densities, which resulted in AC corrosion anomaliesdetected during in-line inspections (ILI). The findings of this case study, presented in the NACE Corrosion2019 Paper No. 13188, indicated that the 120 Hz rectifier ripple may have contributed to the acceleratedAC corrosion at this location.This follow-up paper is Part A of a two-part further investigation into corrosion rates on cathodicallyprotected structures due to AC frequencies other than the fundamental power frequencies of 50 Hz and60 Hz. Part A involves additional field testing on the subject pipeline, and commissioning of therecommended AC mitigation and monitoring systems. Part B of this investigation will be presented in aseparate paper (NACE Corrosion 2020 Paper No. 14916) and will discuss the results of laboratory testingto determine corrosion rates of cathodically protected steel in simulated soil conditions at various ACfrequencies.
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This paper involved a case study of a project involving AC interference on pipelines located in Canada where soil resistivities increase rapidly by up to several orders of magnitude once water in the soil freezes in the winter.