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Case Study - AC Mitigation Design without Powerline Data

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Pipeline corrosion may result from alternating current (AC) interferences from various sources, for example, high voltage AC (HVAC) transmission lines collocated with pipelines. AC mitigation is necessary to minimize corrosion risk, as well as personnel hazard, if intensity of AC interferences, normally characterized as AC induced voltage and current density, exceeds certain thresholds. Field readings of AC induced voltage and AC current density obtained from test points along a pipeline are often regarded as indicators of such risks.

Product Number: 51323-18983-SG
Author: Baotong Lu, Hui Yu, Bryan Barker
Publication Date: 2023
$0.00
$20.00
$20.00

Field readings of induced AC voltage and AC current density from test points along a pipeline are regarded as an indicator of corrosion risk and personnel hazard caused by AC interference from collocated powerlines. Field data also provides the foundation to develop predictive modeling for AC mitigation design. A major technical challenge during modeling often results from unavailable current loads of collocated powerlines. This report introduces our experience regarding this situation and provides a solution option. It is demonstrated that current loads can be estimated via simulating the field reading profiles. The model based on the estimated current loads is applicable in AC mitigation design.

Field readings of induced AC voltage and AC current density from test points along a pipeline are regarded as an indicator of corrosion risk and personnel hazard caused by AC interference from collocated powerlines. Field data also provides the foundation to develop predictive modeling for AC mitigation design. A major technical challenge during modeling often results from unavailable current loads of collocated powerlines. This report introduces our experience regarding this situation and provides a solution option. It is demonstrated that current loads can be estimated via simulating the field reading profiles. The model based on the estimated current loads is applicable in AC mitigation design.

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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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AC Mitigation Design Considerations for Pipeline Facilities

Product Number: 51323-18867-SG
Author: Hycem Bahgat, Sorin Segall, Ernesto Gudino
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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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