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07647 Mitigation Techniques for AC-DC Cathodic Decoupling

Picture for 07647 Mitigation Techniques for AC-DC Cathodic Decoupling
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Product Number: 51300-07647-SG
ISBN: 07647 2007 CP
Author: Gary Numedahl
Publication Date: 2007
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$20.00
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As technology and communication continues to develop allowing more real time data to be acquired or complex electrical systems to operate pipeline related facilities, cathodic protection (CP) systems are being strained. The use of electronic equipment required for remote pressure monitoring, metering information, valve operators, and other functions can create a direct short from the direct current (DC) system on the pipeline to the electric power company’s alternating current (AC) grounding system. Improperly designed and installed grounding grids, using copper for example, is a cause cathodic a drain on the pipeline system. In essence, the cathodic protection system is protecting more than just the pipeline. Mitigation methods including decouplers, isolation transformers or solar power may be used to maintain the DC voltage on the pipeline ensuring cathodic protection of the structures. This problem creates pipe to soil potentials that may not meet DOT 192 Criteria1.
As technology and communication continues to develop allowing more real time data to be acquired or complex electrical systems to operate pipeline related facilities, cathodic protection (CP) systems are being strained. The use of electronic equipment required for remote pressure monitoring, metering information, valve operators, and other functions can create a direct short from the direct current (DC) system on the pipeline to the electric power company’s alternating current (AC) grounding system. Improperly designed and installed grounding grids, using copper for example, is a cause cathodic a drain on the pipeline system. In essence, the cathodic protection system is protecting more than just the pipeline. Mitigation methods including decouplers, isolation transformers or solar power may be used to maintain the DC voltage on the pipeline ensuring cathodic protection of the structures. This problem creates pipe to soil potentials that may not meet DOT 192 Criteria1.
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