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Challenges Of Mitigating AC Interference Risks In A 107 Km Multi-Pipeline Corridor

Challenges Of Mitigating AC Interference Risks In A 107 Km Multi-Pipeline Corridor
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This case study involves an NPS 36, 107 km long pipeline (Pipeline A) installed in 2016. The subject pipeline is collocated with an NPS 30 pipeline constructed in 1999 (Pipeline B), for the entire route, and two additional pipelines near the start of its route (Pipelines C and D), all owned by the same operator. 

Product Number: 51322-17949-SG
Author: Wolfgang Fieltsch, Paul Murray
Publication Date: 2022
Industries: Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control , Coatings
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An initial AC interference study and mitigation design was performed prior to construction, on the subject NPS 36, 107 km long pipeline (Pipeline A) installed in 2016. The subject pipeline is collocated with an NPS 30 pipeline (Pipeline B) constructed in 1999, for the entire route, and several other pipelines in some areas, all owned by the same operator and with shared cathodic protection systems. Five areas of powerline collocation were identified and modeled in the AC Interference study. 

An initial AC interference study and mitigation design was performed prior to construction, on the subject NPS 36, 107 km long pipeline (Pipeline A) installed in 2016. The subject pipeline is collocated with an NPS 30 pipeline (Pipeline B) constructed in 1999, for the entire route, and several other pipelines in some areas, all owned by the same operator and with shared cathodic protection systems. Five areas of powerline collocation were identified and modeled in the AC Interference study. 

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Product Number: 51322-17786-SG
Author: Hycem Bahgat
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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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Comparing AC Study Techniques In Addressing AC Corrosion Risk

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

Product Number: 51322-17587-SG
Author: Jessica Jaskolka
Publication Date: 2022
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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.
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