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10104 Development of an Advanced Instrumentation for Assessing AC Corrosion Risk of Buried Pipelines

Picture for 10104 Development of an Advanced Instrumentation for Assessing AC Corrosion Risk of Buried Pipelines
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Product Number: 51300-10104-SG
ISBN: 10104 2010 CP
Author: Fumio Kajiyama, Yasuo Nakamura
Publication Date: 2010
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$20.00
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Recently, in Japan like other countries in the world, pipelines are being constructed in parallel with HVAC electrical power lines and/or AC traction railroads with thinner, high strength walls, high resistivity coating with little or no corrosion allowance. This means that more attention must be paid to new threats, that is, AC corrosion and overprotection on modern pipelines. To determine the AC corrosion risk, coupons should be installed where the AC current density reaches its maximum. The AC current density IAC together with DC current density IDC of a coupon are the primary determining factors in assessing the AC corrosion risk.

The authors have developed an advanced instrumentation for assessing the AC corrosion risk of buried pipelines. The most distinguished feature is the simultaneous computation in a measuring unit of 20 ms regarding coupon DC current density IDC and coupon AC current density IAC (50 Hz) corresponding to the commercial frequency of 50 Hz that is the predominant frequency component on AC corrosion of buried pipelines. Immediately after computing the averaged IDC and IAC (50 Hz) in measuring time, the results are referred to the coupon current density-based cathodic protection (CP) criterion established by the authors.

Keywords: pipeline, AC corrosion, coupon, coupon current density-based CP (cathodic protection) criterion
Recently, in Japan like other countries in the world, pipelines are being constructed in parallel with HVAC electrical power lines and/or AC traction railroads with thinner, high strength walls, high resistivity coating with little or no corrosion allowance. This means that more attention must be paid to new threats, that is, AC corrosion and overprotection on modern pipelines. To determine the AC corrosion risk, coupons should be installed where the AC current density reaches its maximum. The AC current density IAC together with DC current density IDC of a coupon are the primary determining factors in assessing the AC corrosion risk.

The authors have developed an advanced instrumentation for assessing the AC corrosion risk of buried pipelines. The most distinguished feature is the simultaneous computation in a measuring unit of 20 ms regarding coupon DC current density IDC and coupon AC current density IAC (50 Hz) corresponding to the commercial frequency of 50 Hz that is the predominant frequency component on AC corrosion of buried pipelines. Immediately after computing the averaged IDC and IAC (50 Hz) in measuring time, the results are referred to the coupon current density-based cathodic protection (CP) criterion established by the authors.

Keywords: pipeline, AC corrosion, coupon, coupon current density-based CP (cathodic protection) criterion
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The State of the Art in the technical/scientific knowledge of the subject of AC corrosion on cathodically protected pipelines. Its mitigation, the studies and the issue of relevant Standards & Recommendations will also be dealt with.
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Product Number: 51317--9455-SG
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The measurement of induced AC voltages along a pipeline is a primary indicator of electrical safety hazards and AC corrosion risks under operating powerlines. This paper addresses several fallacies, misconceptions and common errors related to the measurement of these AC induced voltages.

 
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