Buried pipelines can be subject to transitional environments due to changes in soil type or moisture content. Changes in the height of the water table, for example, will affect not only the availability of water but also the access of oxygen to the pipe surface. Transitions between different soil types will also result in different exposure conditions for different parts of the pipe. These variations can affect the distribution of potential on the pipe surface and the ability of the CP system to provide adequate protection. A combination of laboratory-scale soil box tests and field measurements on operating pipelines has been used to study the effect of varying moisture content and water level on the level of cathodic protection and on pipe-depth environmental conditions. In both laboratory tests and field trials, the degree of protection was found to depend on the availability of cathodic reactants ( and/or ). Ingress of results in a positive shift in potential as more current is required to electrochemically reduce the oxidant and the pipe is less easily polarized. Under some circumstances, the ingress of water has the same effect. Although more aerobic conditions lead to more positive potentials, the pipe is not necessarily less well protected. In many dry and/or high resistivity soils, the pipe surface may well be passive because of the high interfacial pH and/or high concentration.
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e-mail: fraser.king@shaw.ca
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February 2011
Research Papers
Effect of Transitions in the Water Table and Soil Moisture Content on the Cathodic Protection of Buried Pipelines
Fraser King,
e-mail: fraser.king@shaw.ca
Fraser King
NOVA Chemicals Research & Technology Centre
, Calgary, AB, T2E 7K7, Canada
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Russell Given,
Russell Given
NOVA Chemicals Research & Technology Centre
, Calgary, AB, T2E 7K7, Canada
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Robert G. Worthingham,
Robert G. Worthingham
TransCanada Pipelines
, Calgary, AB, T2P 5H1, Canada
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Greg Van Boven
Greg Van Boven
Duke Energy Gas Transmission
, Vancouver, BC, V6E 3K9, Canada
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Fraser King
NOVA Chemicals Research & Technology Centre
, Calgary, AB, T2E 7K7, Canadae-mail: fraser.king@shaw.ca
Russell Given
NOVA Chemicals Research & Technology Centre
, Calgary, AB, T2E 7K7, Canada
Robert G. Worthingham
TransCanada Pipelines
, Calgary, AB, T2P 5H1, Canada
Greg Van Boven
Duke Energy Gas Transmission
, Vancouver, BC, V6E 3K9, CanadaJ. Pressure Vessel Technol. Feb 2011, 133(1): 011703 (6 pages)
Published Online: January 21, 2011
Article history
Received:
January 10, 2007
Revised:
August 3, 2009
Online:
January 21, 2011
Published:
January 21, 2011
Citation
King, F., Given, R., Worthingham, R. G., and Van Boven, G. (January 21, 2011). "Effect of Transitions in the Water Table and Soil Moisture Content on the Cathodic Protection of Buried Pipelines." ASME. J. Pressure Vessel Technol. February 2011; 133(1): 011703. https://doi.org/10.1115/1.4002255
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