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10034 Cathodic Protection - It's All About Current

Picture for 10034 Cathodic Protection - It's All About Current
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Product Number: 51300-10034-SG
ISBN: 10034 2010 CP
Author: Dennis Janda
Publication Date: 2010
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The external pipeline corrosion control field has seen great change over the years from a regulatory standpoint, but very few advances in new technology to assist in monitoring the effectiveness of mitigation efforts. Recently a new tool for the corrosion professional’s toolbox was introduced – an in-line inspection (ILI) tool that measures cathodic protection (CP) current flowing on a pipeline.

A.W. Peabody stated in his classic book Control of Pipeline Corrosion “When the amount of current flowing (to the pipe) is adjusted properly, it will overpower corrosion current discharging from all anodic areas on the pipeline and there will be a net current flow onto the pipe surface at these points. The entire surface will then be cathodic and the protection complete.” The cathodic protection current measurement tool is an inline inspection tool that measures the voltage drop in the pipe wall that is caused by the accumulation and flow of cathodic protection (CP) current. This voltage is converted to current using Ohm’s law and the data is graphically represented. This paper will explain the benefits of this new technology and present case histories of recent pipeline inspections.

Key words: cathodic protection, current measurement, in-line inspection
The external pipeline corrosion control field has seen great change over the years from a regulatory standpoint, but very few advances in new technology to assist in monitoring the effectiveness of mitigation efforts. Recently a new tool for the corrosion professional’s toolbox was introduced – an in-line inspection (ILI) tool that measures cathodic protection (CP) current flowing on a pipeline.

A.W. Peabody stated in his classic book Control of Pipeline Corrosion “When the amount of current flowing (to the pipe) is adjusted properly, it will overpower corrosion current discharging from all anodic areas on the pipeline and there will be a net current flow onto the pipe surface at these points. The entire surface will then be cathodic and the protection complete.” The cathodic protection current measurement tool is an inline inspection tool that measures the voltage drop in the pipe wall that is caused by the accumulation and flow of cathodic protection (CP) current. This voltage is converted to current using Ohm’s law and the data is graphically represented. This paper will explain the benefits of this new technology and present case histories of recent pipeline inspections.

Key words: cathodic protection, current measurement, in-line inspection
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This paper contains a review of commonly used practices and presents a generalized technique for the calculation of earth potentials for the determination of remoteness of impressed current anode ground beds. The intent is to facilitate proper design and evaluation of anode ground beds of impressed current cathodic protection system for cross-country pipelines.
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This paper reviews the concerns of applying excessive levels of cathodic protection current to pipelines and the need for establishing an upper potential limit. Coating disbondment, hydrogen induced stress cracks, stress corrosion cracking, hard spots and the problems associated with measurement of a true polarized pipe-to-electrolyte potential are addressed.
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