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01316 OBSERVATIONS OF TELLURIC CURRENTS IN CANADIAN PIPELINES

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Product Number: 51300-01316-SG
ISBN: 01316 2002 CP
Author: D.H. Boteler and L. Trichtchenko
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Results are presented from studies oftelluric currents on two pipelines in Canada: the Norman Wells-Zama pipeline in northern Canada, and the North Bay-Morrisburg pipeline in southern Canada. On each pipeline simultaneous recordings were made of pipe-to-soil potentials at different points along the pipe. These observations showed simultaneous fluctuations, at all sites, that coincided with variations of the geomagnetic and geo-electric fields. Tests of the relation between the variations at different sites showed a high correlation at nearby sites and a decrease in correlation at sites more than 100 km apart. This is consistent with the fact that geomagnetic disturbances in Canada are predominantly due to currents in the ionosphere 100 km above the earth's surface. Keywords: telluric currents, pipeline modeling, geomagnetic disturbance
Results are presented from studies oftelluric currents on two pipelines in Canada: the Norman Wells-Zama pipeline in northern Canada, and the North Bay-Morrisburg pipeline in southern Canada. On each pipeline simultaneous recordings were made of pipe-to-soil potentials at different points along the pipe. These observations showed simultaneous fluctuations, at all sites, that coincided with variations of the geomagnetic and geo-electric fields. Tests of the relation between the variations at different sites showed a high correlation at nearby sites and a decrease in correlation at sites more than 100 km apart. This is consistent with the fact that geomagnetic disturbances in Canada are predominantly due to currents in the ionosphere 100 km above the earth's surface. Keywords: telluric currents, pipeline modeling, geomagnetic disturbance
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01315 STUDIES OF TELLURIC CURRENTS ON PIPELINES IN SOUTHERN SWEDEN

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ISBN: 01315 2001 CP
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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
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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.
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