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51318-10898- Comparison of AC Mitigation Grounding Materials Through Electrochemical Analysis

Picture for 51318-10898- Comparison of AC Mitigation Grounding Materials Through Electrochemical Analysis
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A comparative assessment of electrochemical properties of common AC mitigation materials, and assessment of common industry claims with respect to AC mitigation grounding. Provides the corrosion test data and technical information to support a decision for mitigation material selection.

Product Number: 51318-10898-SG
Author: Shane Finneran, P.E. / Ken Evans / Justin Gossard
Publication Date: 2018
Industry: Energy Generation
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$20.00
$20.00

As industry trends are resulting in more shared right of ways between power lines and pipeline utilities, the need for mitigation of AC interference is expanding, further driving the desire for efficient solutions. Low impedance grounding systems are generally used to mitigate elevated AC potential and current density on buried pipelines. Multiple mitigation grounding techniques are in use across the pipeline industry, with varying materials, configurations, and construction practices. While there are pros and cons to each, determination of a preferred mitigation design for a given site should consider overall system efficiency, component design life, and specific material properties.

Presently, a comprehensive review of primary mitigation materials is not available to industry, as historical work generally covers a specific subset of these concepts or designs. This study presents a comparative assessment reviewing the electrochemical properties of common AC mitigation materials, and assesses common industry claims with respect to AC mitigation grounding. The intent of this work is to provide the corrosion test data and technical information to support an engineering based decision for mitigation material selection.

Key Words: AC Mitigation, zinc ribbon, passivation, Electrochemical impedance spectroscopy

As industry trends are resulting in more shared right of ways between power lines and pipeline utilities, the need for mitigation of AC interference is expanding, further driving the desire for efficient solutions. Low impedance grounding systems are generally used to mitigate elevated AC potential and current density on buried pipelines. Multiple mitigation grounding techniques are in use across the pipeline industry, with varying materials, configurations, and construction practices. While there are pros and cons to each, determination of a preferred mitigation design for a given site should consider overall system efficiency, component design life, and specific material properties.

Presently, a comprehensive review of primary mitigation materials is not available to industry, as historical work generally covers a specific subset of these concepts or designs. This study presents a comparative assessment reviewing the electrochemical properties of common AC mitigation materials, and assesses common industry claims with respect to AC mitigation grounding. The intent of this work is to provide the corrosion test data and technical information to support an engineering based decision for mitigation material selection.

Key Words: AC Mitigation, zinc ribbon, passivation, Electrochemical impedance spectroscopy

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51318-10603-Looking Back and Understanding a Case History of AC Corrosion

Product Number: 51318-10603-SG
Author: Joe Pikas
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A case history of a large diameter pipeline with fusion bonded epoxy coating that experienced AC corrosion within six (6) years while a similar 67-year-old pipeline with coal tar enamel coating experienced none.
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51318-10847- A Critical Review of Parameters for Meaningful AC Corrosion Modelling

Product Number: 51318-10847-SG
Author: Ernesto Santana-Diaz / Andreas Junker-Holst / Lars Vendelbo Nielsen
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The present paper presents and discusses the various components contained in an electrical equivalent circuit describing the AC corrosion process from a computer modelling perspective.
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51318-10911-Field Examination of AC Accelerated Corrosion Featured in Monitored Locations

Product Number: 51318-10911-SG
Author: Shane Finneran, P.E. / Dr. Dave Norfleet / Lyle Buckingham
Publication Date: 2018
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AC current density (rather than voltage alone) should always be the factor considered when assessing susceptibility to AC corrosion. Also presented are analyses used in assessing the metal loss features and the comparison of site-specific data.
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