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10032 Proposal of CP Criterion in the Presence of AC-Interference

Picture for 10032 Proposal of CP Criterion in the Presence of AC-Interference
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Product Number: 51300-10032-SG
ISBN: 10032 2010 CP
Author: Marco Ormellese, Luciano Lazzari, Andrea Brenna and Andrea Trombetta
Publication Date: 2010
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In order to assess cathodic protection (CP) criteria in the presence of alternate current (AC) interference, weight loss tests on cathodically protected carbon steel specimens (CP current density in the range of 0.2 to 10 A/m2) were performed in soil-simulated conditions in the presence of AC densities ranging from 10 to about 500 A/m2. Aim of the research is to define threshold of AC-parameters to assure no risk of corrosion on metallic structures under CP. Tests allow to state that in the presence of AC interference, the risk of corrosion depends on: AC density, protection potential and the ratio between AC and DC densities. On the basis of obtained results, CP level may be considered effective if protection potential is in the range –1.0 to –1.15 V CSE, provided iAC/iDC ratio is lower than 200 and no overprotection conditions were established. In 2008, field test started on thirty carbon steel coupon subjected to AC interference. Both cathodic protection and free corrosion conditions were considered.

Keywords: AC interference, cathodic protection, true potential, monitoring
In order to assess cathodic protection (CP) criteria in the presence of alternate current (AC) interference, weight loss tests on cathodically protected carbon steel specimens (CP current density in the range of 0.2 to 10 A/m2) were performed in soil-simulated conditions in the presence of AC densities ranging from 10 to about 500 A/m2. Aim of the research is to define threshold of AC-parameters to assure no risk of corrosion on metallic structures under CP. Tests allow to state that in the presence of AC interference, the risk of corrosion depends on: AC density, protection potential and the ratio between AC and DC densities. On the basis of obtained results, CP level may be considered effective if protection potential is in the range –1.0 to –1.15 V CSE, provided iAC/iDC ratio is lower than 200 and no overprotection conditions were established. In 2008, field test started on thirty carbon steel coupon subjected to AC interference. Both cathodic protection and free corrosion conditions were considered.

Keywords: AC interference, cathodic protection, true potential, monitoring
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51315-5753-Cathodic Protection Criteria in The Presence of AC Interference

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08064 CP Criteria Assessment in the Presence of AC Interference

Product Number: 51300-08064-SG
ISBN: 08064 2008 CP
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Picture for Challenges in Mitigating AC Interference in Remote Areas
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Challenges in Mitigating AC Interference in Remote Areas

Product Number: 51317--9090-SG
ISBN: 9090 2017 CP
Author: Malvin Luk
Publication Date: 2017
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An AC interference study was conducted in 2015 after the installation of a 240 kV powerline. Risk of AC corrosion was indicated.  Describe are both the challenges and the solutions, including the design of a temporary mitigation system allowing energization of the powerline at reduced power.
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