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TitleTelluric currents and their effecct on cathodic protection of pipelines
AuthorBoteler, D H
SourceProceedings of CORROSION 2004; 2004 p. 1-12
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20100345
MeetingCORROSION 2004; New Orleans; US; March 28 - April 1, 2004
Mediapaper; on-line; digital
Subjectsgeophysics; engineering geology; pipelines; pipeline feasibility studies; telluric surveys; telluric interpretations; telluric field; geomagnetic fields; geomagnetic variations; geomagnetism; models; modelling
Illustrationsgraphs; plots; diagrams
ProgramTargeted Hazard Assessments in Northern Canada, Public Safety Geoscience
AbstractTelluric 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. The pipe-to-soil potential variations created by telluric currents are described using results from recent studies involving extensive telluric current observations and modeling. Finally, this knowledge is used to show how design changes can influence the impact of telluric currents on the cathodic protection of pipelines.