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Monitoring Strategies for Effective AC Mitigation Integrity Management

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Corrosion risk due to AC interference has been known to be a possibility for decades but really came to the awareness of pipeline industry professionals starting around 2000 to 2004. Prior to that time there were some lab simulations as well as some suspected incidents in actual field situations, but many in the industry resisted accepting this as a real risk even as late as 2012 or later. Part of the reluctance to view AC interference as a genuine corrosion risk was that corrosion directly attributed to AC interference had not really been seen in the century of buried pipeline management, as well as a lack of understanding as to how this interference produced or accelerated corrosion on the pipeline.

Product Number: 51323-18885-SG
Author: Jamey Hilleary
Publication Date: 2023
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$20.00
$20.00

The technology available for monitoring induced alternating current (AC) levels and additional corrosion risk factors for AC corrosion risk has continuously evolved along with the recognition of AC as a significant factor in pipeline corrosion. This paper covers the current state of the art regarding monitoring AC levels and AC corrosion risk on buried structures as well as monitoring the effectiveness of AC mitigation deployed to alleviate the risk of corrosion due to AC interference. Significant topics include induced AC interference, AC and DC current density factors, AC voltage for safe touch and as the driving force for elevated current density, and AC drain to ground and grounding efficiency. Cost-effective and best practices monitoring strategies are discussed as well as the value of continual assessment of AC and DC values relating to ongoing corrosion risk.

The technology available for monitoring induced alternating current (AC) levels and additional corrosion risk factors for AC corrosion risk has continuously evolved along with the recognition of AC as a significant factor in pipeline corrosion. This paper covers the current state of the art regarding monitoring AC levels and AC corrosion risk on buried structures as well as monitoring the effectiveness of AC mitigation deployed to alleviate the risk of corrosion due to AC interference. Significant topics include induced AC interference, AC and DC current density factors, AC voltage for safe touch and as the driving force for elevated current density, and AC drain to ground and grounding efficiency. Cost-effective and best practices monitoring strategies are discussed as well as the value of continual assessment of AC and DC values relating to ongoing corrosion risk.

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Picture for Comparing AC Study Techniques In Addressing AC Corrosion Risk
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Comparing AC Study Techniques In Addressing AC Corrosion Risk

Product Number: 51322-17735-SG
Author: Perry Ross
Publication Date: 2022
$20.00

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.
Picture for AC Mitigation Design Considerations for Pipeline Facilities
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AC Mitigation Design Considerations for Pipeline Facilities

Product Number: 51323-18867-SG
Author: Hycem Bahgat, Sorin Segall, Ernesto Gudino
Publication Date: 2023
$20.00

When a pipeline is co-located with an AC powerline, it is subject to AC interference effects. These AC interference effects can result in safety hazards to operating personnel and the public under powerline steady-state (normal operation) and fault (short-circuit) conditions.
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Obtaining The Polarized Potential Under AC Interference

Product Number: 51322-17634-SG
Author: Andreas Junker Olesen, Lars Vendelbo Nielsen
Publication Date: 2022
$20.00

The -850 mV (CSE) criterion refers to the polarized pipeline potential that is free of any IR-drop. Different methods to obtain the polarized potential exist. Interruption of the CP current will cause the current, I, and thus the IR-drop to become zero and the remaining polarization immediately after the interruption is representative of the polarized potential of the pipeline.
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