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Case Study - Sharing An AC Mitigation System

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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.

Product Number: 51322-17786-SG
Author: Hycem Bahgat, Daniel Hebb, Sorin Segall, Ernesto Gudino, Karl Shen, Shan Jiang
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00

An alternating current (AC) interference study was conducted in 2019 following a utility development project that included constructing a new substation and upgrading approximately 24 km of new AC transmission powerline sections in Alberta, Canada. The study comprised six transmission powerlines owned by one utility and eight pipelines owned by two different operators.

The modelling results showed touch voltage hazards under steady-state and fault conditions and susceptibility to AC corrosion and coating stress above the established limits in the unmitigated state.

A shared AC mitigation system was designed to eliminate the hazards caused by AC interference on all eight pipelines. This approach reduced overall mitigation requirements, number of site visits, construction footprint, environmental impact, and project costs.

This paper describes the mitigation system's design, installation, and commissioning and discusses the benefits of a shared AC mitigation system approach.

An alternating current (AC) interference study was conducted in 2019 following a utility development project that included constructing a new substation and upgrading approximately 24 km of new AC transmission powerline sections in Alberta, Canada. The study comprised six transmission powerlines owned by one utility and eight pipelines owned by two different operators.

The modelling results showed touch voltage hazards under steady-state and fault conditions and susceptibility to AC corrosion and coating stress above the established limits in the unmitigated state.

A shared AC mitigation system was designed to eliminate the hazards caused by AC interference on all eight pipelines. This approach reduced overall mitigation requirements, number of site visits, construction footprint, environmental impact, and project costs.

This paper describes the mitigation system's design, installation, and commissioning and discusses the benefits of a shared AC mitigation system approach.

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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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Case Analysis Of Electromagnetic Interference Of AC Substation On Pipeline

Product Number: 51322-17517-SG
Author: Su Jin
Publication Date: 2022
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A substation is a place where the power system converts voltage and current and receives and distributes electric energy. When a phase line is abnormally connected to another phase line or ground, a large amount of current will flow into the ground through the grounding bed of the substation. In such case, if metal structures exist such as buried pipelines near the substation, the pipelines often withstand serious electrical interference 1, which causes stray current corrosion of the pipelines 2 and other safety problems.
Challenges Of Mitigating AC Interference Risks In A 107 Km Multi-Pipeline Corridor
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Challenges Of Mitigating AC Interference Risks In A 107 Km Multi-Pipeline Corridor

Product Number: 51322-17949-SG
Author: Wolfgang Fieltsch, Paul Murray
Publication Date: 2022
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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. 
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