Using Inline CP Tools in Multiple Pipeline Corridors

March 2017, Vol. 244, No. 3

By Dennis C. Janda and David M. Williams, Baker Hughes, and Len J. Krissa, Enbridge Liquids Pipelines

Many operators have adopted performing close interval surveys (CIS) on routine intervals to assess cathodic protection (CP) effectiveness over a length of pipeline at a high-resolution level. This technique measures and records the pipe-to-soil potential of the pipeline at consistent spacing of typically between 1-3 meters. In the past several years, the accuracy of close-spaced CP surveys has dramatically improved through the application of modern electronic data sampling and logging in conjunction with global positioning system (GPS) synchronized current interrupters. However, coinciding with these advancements, new challenges have arisen from the expanding needs of Enbridge’s…

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