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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
$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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AC interference analysis between high voltage AC (HVAC) powerlines and buried pipelines is a matter of current interest due to the growing number of right-of-ways shared between powerline and pipeline infrastructure. This is only expected to increase as the worldwide energy demand grows considerably over the next 30 years,1 and stricter environmental regulations and policies are applied. Therefore, AC interference will continue to be an issue of concern for powerline and pipeline operators to protect the public, environment, and maintain asset integrity.
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51318-10689-PIPELINE STRAY DIRECT CURRENT (DC) INTERFERENCE

Product Number: 51318-10689-SG
Author: Eric S. Langelund
Publication Date: 2018
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Concerns related to stray DC interference. Including safety, testing, documentation and lessons learned. Also addressed are DC powered transit systems and other unordinary sources of DC interference.
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03710 INTERFERENCE TESTING AND CASE HISTORIES

Product Number: 51300-03710-SG
ISBN: 03710 2003 CP
Author: Jeffrey L. Didas
Publication Date: 2003
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Interference Testing is a task learned through education and experience and is one of the basic skills of Cathodic Protection Personnel. This paper will discuss interference testing and present some case histories, of basic static interference situations and the mitigation methods used.
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