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51315-5606-Modern AC Mitigation Performance Testing and Comparison

Picture for Modern AC Mitigation Performance Testing and Comparison
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Product Number: 51315-5606-SG
ISBN: 5606 2015 CP
Author: Christopher Sheldon
Publication Date: 2015
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$20.00
$20.00
The requirement for AC mitigation has become an absolute necessity for pipeline operators. Safety concerns involving step and touch potentials and the risks of through-wall corrosion leaks as a result of induced AC drive this requirement. Improved pipeline mainline coatings with smaller and fewer coating “holidays” can result in concentrated AC corrosion with the potential for catastrophic events. Adding to the safety risks “not in my backyard” right-of-way challenges force operators to construct new pipelines within existing overhead corridors as their only option.Modern AC mitigation systems have evolved to use metallic grounding systems connected to solid-state DC decoupling devices. Historically two grounding system options have been available including zinc ribbon anode and bare copper. Today there is a third engineered AC mitigation option that combines the benefits of copper grounding with a corrosion-inhibiting backfill that has a very low electrical resistivity.This presentation provides a real life comparison of the performance characteristics of these metallic grounding systems – zinc ribbon anode bare copper and the engineered AC mitigation system. A test bed has been constructed at an operator’s facility in Oswego NY at a location with intensive overhead electrical transmission facilities and operating steel gas transmission pipelines. The facility is the site of a documented 2002 steel gas transmission pipeline AC through-wall corrosion leak.The test bed was constructed to individually test the zinc ribbon anode bare copper grounding and the engineered AC mitigation system to measure their ability to reduce the induced AC voltage. Field test data is provided and conclusions are made regarding the superior performance of the engineered AC mitigation system.In addition the test bed was constructed to provide insight regarding spatial affects of the grounding system including both lateral alignment and cover depth relative to the positioning of the steel pipeline. Grounding systems are often installed within ten feet of the pipeline. The field test data suggests that AC mitigation installed laterally at a distance of ten feet or more from the pipeline is more effective. In addition to better AC mitigation performance this results in an increased working space that provides a clear safety benefit to the grounding system installers.Contact MATCOR
The requirement for AC mitigation has become an absolute necessity for pipeline operators. Safety concerns involving step and touch potentials and the risks of through-wall corrosion leaks as a result of induced AC drive this requirement. Improved pipeline mainline coatings with smaller and fewer coating “holidays” can result in concentrated AC corrosion with the potential for catastrophic events. Adding to the safety risks “not in my backyard” right-of-way challenges force operators to construct new pipelines within existing overhead corridors as their only option.Modern AC mitigation systems have evolved to use metallic grounding systems connected to solid-state DC decoupling devices. Historically two grounding system options have been available including zinc ribbon anode and bare copper. Today there is a third engineered AC mitigation option that combines the benefits of copper grounding with a corrosion-inhibiting backfill that has a very low electrical resistivity.This presentation provides a real life comparison of the performance characteristics of these metallic grounding systems – zinc ribbon anode bare copper and the engineered AC mitigation system. A test bed has been constructed at an operator’s facility in Oswego NY at a location with intensive overhead electrical transmission facilities and operating steel gas transmission pipelines. The facility is the site of a documented 2002 steel gas transmission pipeline AC through-wall corrosion leak.The test bed was constructed to individually test the zinc ribbon anode bare copper grounding and the engineered AC mitigation system to measure their ability to reduce the induced AC voltage. Field test data is provided and conclusions are made regarding the superior performance of the engineered AC mitigation system.In addition the test bed was constructed to provide insight regarding spatial affects of the grounding system including both lateral alignment and cover depth relative to the positioning of the steel pipeline. Grounding systems are often installed within ten feet of the pipeline. The field test data suggests that AC mitigation installed laterally at a distance of ten feet or more from the pipeline is more effective. In addition to better AC mitigation performance this results in an increased working space that provides a clear safety benefit to the grounding system installers.Contact MATCOR
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