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51318-11271- AC Corrosion Control: When Too Much Cathodic Protection Might Just be a Bad Thing!

Case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. Includes the use of fast-response electrical resistance corrosion rate probe monitoring technology.

Product Number: 51318-11271-SG
Author: Dale Lindemuth / Dan Crabtree
Publication Date: 2018
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 Industry guidance such as European Standard EN-15280(1) and applied research by Pipeline Research Council International (PRCI)(2) highlight the interaction cathodic direct currents can have on pipeline corrosion influenced by alternating currents. Often, excessive levels of cathodic protection (or cathodic interference) can exacerbate AC-influenced corrosion. Conversely, effective management of cathodic protection in conjunction with monitoring the AC and DC effects on a pipeline can be a valued component of an optimized AC corrosion control strategy. This paper presents case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. The investigations include the use of fast-response electrical resistance (ER) corrosion rate probe monitoring technology.

 Key Words: AC interference, mitigation, current density, AC-influenced corrosion, electrical resistance corrosion rate probe, cathodic protection, remote monitoring, computer modeling/simulations.

 

 Industry guidance such as European Standard EN-15280(1) and applied research by Pipeline Research Council International (PRCI)(2) highlight the interaction cathodic direct currents can have on pipeline corrosion influenced by alternating currents. Often, excessive levels of cathodic protection (or cathodic interference) can exacerbate AC-influenced corrosion. Conversely, effective management of cathodic protection in conjunction with monitoring the AC and DC effects on a pipeline can be a valued component of an optimized AC corrosion control strategy. This paper presents case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. The investigations include the use of fast-response electrical resistance (ER) corrosion rate probe monitoring technology.

 Key Words: AC interference, mitigation, current density, AC-influenced corrosion, electrical resistance corrosion rate probe, cathodic protection, remote monitoring, computer modeling/simulations.

 

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