Menu
Search
Filters
Close
Menu

51314-4171-Induced Polarization (IP) of Soil as a Source of Error in Cathodic Protection Potential Measurements

Picture for Induced Polarization (IP) of Soil as a Source of Error in Cathodic Protection Potential Measurements
Available for download
Product Number: 51314-4171-SG
ISBN: 4171 2014 CP
Author: Rob Wakelin
Publication Date: 2014
$0.00
$0.00
$0.00
It is generally accepted that a buried steel structure cannot be cathodically polarized to a potential much more electronegative than -1200 mVCSE due to the limiting potential encountered with the electrolysis of water. Nevertheless cathodic protection data obtained in the field often include off-potential measurements significantly more electronegative than would seem possible in theory. While this might usually be explained as a failure to interrupt all influential sources of cathodic protection current it is proposed that polarization of the soil itself in some cases may produce such errors.Time-domain induced polarization (IP) is a well-established geophysical survey technique in which the polarization characteristics of the soil are measured as a means of identifying mineral deposits. This paper discusses the theory of the IP technique and suggests how the polarization of certain soils might lead to off-potential measurements which are excessively electronegative. Off-potential data from several case studies are presented to support this theory.
It is generally accepted that a buried steel structure cannot be cathodically polarized to a potential much more electronegative than -1200 mVCSE due to the limiting potential encountered with the electrolysis of water. Nevertheless cathodic protection data obtained in the field often include off-potential measurements significantly more electronegative than would seem possible in theory. While this might usually be explained as a failure to interrupt all influential sources of cathodic protection current it is proposed that polarization of the soil itself in some cases may produce such errors.Time-domain induced polarization (IP) is a well-established geophysical survey technique in which the polarization characteristics of the soil are measured as a means of identifying mineral deposits. This paper discusses the theory of the IP technique and suggests how the polarization of certain soils might lead to off-potential measurements which are excessively electronegative. Off-potential data from several case studies are presented to support this theory.
Product tags
Also Purchased
Picture for 08070 Pipe-to-Soil Potential Measurements, The Basic Science
Available for download

08070 Pipe-to-Soil Potential Measurements, The Basic Science

Product Number: 51300-08070-SG
ISBN: 08070 2008 CP
Author: L. A. Bash
Publication Date: 2008
$20.00

Based on some articles that have been published in Materials Performance (MP) and the NACE Courses 9 and Standards for Cathodic Protection (CP) practitioners, this author has concluded that present day CP practitioners, do not have an adequate understanding of some basic scientific principles.
Picture for Limits of the ON-OFF Technique for the Assessment of Cathodic Protection of Buried Pipeline
Available for download

51316-7853-Limits of the ON-OFF Technique for the Assessment of Cathodic Protection of Buried Pipeline

Product Number: 51316-7853-SG
ISBN: 7853 2016 CP
Author: Marco Ormellese
Publication Date: 2016
$20.00
Picture for 06163 CATHODIC PROTECTION OF PIPELINES
Available for download

06163 CATHODIC PROTECTION OF PIPELINES IN HIGH RESISTIVITY SOILS AND THE EFFECT OF SEASONAL CHANGES

Product Number: 51300-06163-SG
ISBN: 06163 2006 CP
Author: Fraser King, Greg Van Boven, P, Nichols, Rod Reid, Kurt Lawson and Neil Thompson
Publication Date: 2006
$20.00

The effect of seasonal changes on the protection of pipelines in high-resistivity soil. The nature and magnitude of the seasonal fluctuations. Corrosion rates are low even when compliance with a given CP criterion cannot be demonstrated.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support