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Case Study: Foreign Operator DC Interference On An Existing Pipeline Systems

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EN Engineering (ENE) completed an AC interference study over 68 miles of an operator’s transmission line. In addition, an ACVG survey of approximately one (1) mile of the pipeline was conducted at the take-off point of the 8” line. As a result of this AC interference study, evidence of elevated AC corrosion risk has not been found on the operator’s pipeline. However, a review of the provided data shows evidence of DC interference due to a nearby foreign rectifier groundbed at the take-off point of the operator’s line.

Product Number: 51322-17587-SG
Author: Jessica Jaskolka
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00

Close Interval pipe-to-soil Surveys (CIS), Alternating Current Voltage Gradient (ACVG), and In-Line Inspection (ILI) data suggested corrosion activity on a buried gas transmission pipeline. An analysis of the survey results and additional testing in the field determined a foreign operator was responsible for static DC interference on the pipeline. This paper is a case study for the testing, analysis, and design for the interference.

Close Interval pipe-to-soil Surveys (CIS), Alternating Current Voltage Gradient (ACVG), and In-Line Inspection (ILI) data suggested corrosion activity on a buried gas transmission pipeline. An analysis of the survey results and additional testing in the field determined a foreign operator was responsible for static DC interference on the pipeline. This paper is a case study for the testing, analysis, and design for the interference.

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Product Number: 51322-17786-SG
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Product Number: 51322-17655-SG
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Product Number: 51322-17735-SG
Author: Perry Ross
Publication Date: 2022
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AC interference studies have become increasingly popular in an industry where shared right of ways have increased and there has been a better understanding of how AC interacts between pipelines and powerlines that are collocated with each other. While modeling software for AC interference studies have been developed since the 1990s, advancement in AC interference processes have occurred as more has been learned over the years. When performing an AC interference study there are three steps that need to be completed: field data collection, modeling, and mitigation design. Within this paper, we can compare a project from ten years ago to a project from today to understand the developments that have been made over the course of time to improve the way we develop our mitigation designs.
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