Influence of AC interference on the cathodic protection potentials of pipelines: Towards a comprehensive picture

Abstract

AC interference on metallic structures has been a major challenge to the operational services of utilities around the world. As a result of frequent installation of metallic pipelines in the energy utility corridor of transmission lines, AC interference problem is prominent. A major research area is the development of an optimum cathodic protection (CP) potential for protecting the pipeline in the presence of AC. In this study, an investigation on the influence of AC potential variation on the stability nature of some CP potentials was conducted using a small experimental test beds derived from the real situation of pipeline-power line right of way. A promising result was observed when a CP of −1150 mV is applied to the steel pipe specimen. At this CP potential, a better stability is observed, among other potentials, under the presence of the same varying AC voltages. Detailed graph is presented herein which could be useful for utility engineers.