Menu
Search
Filters
Close
Menu

07686 ASSESSING PIPELINE VULNERABILITY TO TELLURIC CURRENTS

Picture for 07686 ASSESSING PIPELINE VULNERABILITY TO TELLURIC CURRENTS
Available for download
Product Number: 51300-07686-SG
ISBN: 07686 2007 CP
Author: D.H. Boteler
Publication Date: 2007
$0.00
$20.00
$20.00
Telluric currents produce variations in pipe-to-soil potential (PSP) that take the pipeline outside the voltage range for cathodic protection and interfere with potential surveys. The size of the PSP variation depends on a variety of factors related both to the natural environment and the characteristics of the pipeline itself. This paper presents a methodology for assessing how different pipeline features influence the vulnerability of the pipeline to telluric effects. Derivation of the distributed-source transmission line (DSTL) equations for induction in a pipeline show that the critical parameters are the series impedance of the pipeline steel and the parallel conductance to ground through the pipeline coating. Large PSP variations occur where there is a disruption in the flow of telluric currents along the pipeline, such as happens at the end of the pipeline, at flanges, at bends, and changes in pipeline characteristics. A series of plots are presented showing the dependence of PSP variations on coating conductance, changes in series impedance and bends in the pipeline. Also examined are how the PSP variations are modified when overlapping effects occur. Finally, the paper considers the effect of various mitigation strategies and presents model results of the reduction in PSP variations that can be achieved.
Telluric currents produce variations in pipe-to-soil potential (PSP) that take the pipeline outside the voltage range for cathodic protection and interfere with potential surveys. The size of the PSP variation depends on a variety of factors related both to the natural environment and the characteristics of the pipeline itself. This paper presents a methodology for assessing how different pipeline features influence the vulnerability of the pipeline to telluric effects. Derivation of the distributed-source transmission line (DSTL) equations for induction in a pipeline show that the critical parameters are the series impedance of the pipeline steel and the parallel conductance to ground through the pipeline coating. Large PSP variations occur where there is a disruption in the flow of telluric currents along the pipeline, such as happens at the end of the pipeline, at flanges, at bends, and changes in pipeline characteristics. A series of plots are presented showing the dependence of PSP variations on coating conductance, changes in series impedance and bends in the pipeline. Also examined are how the PSP variations are modified when overlapping effects occur. Finally, the paper considers the effect of various mitigation strategies and presents model results of the reduction in PSP variations that can be achieved.
Product tags
Also Purchased
Picture for 04050 Telluric Currents and Their Effect on
Available for download

04050 Telluric Currents and Their Effect on Cathodic Protection of Pipelines

Product Number: 51300-04050-SG
ISBN: 04050 2004 CP
Author: David Boteler, Geological Survey of Canada
$20.00

Telluric currents cause variations in pipe-to-soil potentials that take the potentials outside the desired range for cathodic protection. This paper reviews the causes of telluric currents, such as geomagnetic storms and tidal water movements, and shows how knowledge of these phenomena can be used to determine the occurrence of telluric current in pipelines.
Picture for 07182 Correcting CIPS Surveys for Stray and Telluric Current Interference
Available for download

07182 Correcting CIPS Surveys for Stray and Telluric Current Interference

Product Number: 51300-07182-SG
ISBN: 07182 2007 CP
Author: J. Peter Nicholson
Publication Date: 2007
$20.00
Picture for 01316 OBSERVATIONS OF TELLURIC CURRENTS
Available for download

01316 OBSERVATIONS OF TELLURIC CURRENTS IN CANADIAN PIPELINES

Product Number: 51300-01316-SG
ISBN: 01316 2002 CP
Author: D.H. Boteler and L. Trichtchenko
$20.00
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