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 depends on the availability of cathodic reactants (O2 and/or H2O). Ingress of O2 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 O2 concentration.
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2006 International Pipeline Conference
September 25–29, 2006
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-4262-2
PROCEEDINGS PAPER
Effect of Transitions in the Water Table and Soil Moisture Content on the Cathodic Protection of Buried Pipelines Available to Purchase
Fraser King,
Fraser King
NOVA Chemicals Research & Technology Centre, Calgary, AB, Canada
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Russell Given,
Russell Given
NOVA Chemicals Research & Technology Centre, Calgary, AB, Canada
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Robert G. Worthingham,
Robert G. Worthingham
TransCanada PipeLines Limited, Calgary, AB, Canada
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Greg Van Boven
Greg Van Boven
Duke Energy Gas Transmission, Vancouver, BC, Canada
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Fraser King
NOVA Chemicals Research & Technology Centre, Calgary, AB, Canada
Russell Given
NOVA Chemicals Research & Technology Centre, Calgary, AB, Canada
Robert G. Worthingham
TransCanada PipeLines Limited, Calgary, AB, Canada
Greg Van Boven
Duke Energy Gas Transmission, Vancouver, BC, Canada
Paper No:
IPC2006-10171, pp. 265-275; 11 pages
Published Online:
October 2, 2008
Citation
King, F, Given, R, Worthingham, RG, & Van Boven, G. "Effect of Transitions in the Water Table and Soil Moisture Content on the Cathodic Protection of Buried Pipelines." Proceedings of the 2006 International Pipeline Conference. Volume 2: Integrity Management; Poster Session; Student Paper Competition. Calgary, Alberta, Canada. September 25–29, 2006. pp. 265-275. ASME. https://doi.org/10.1115/IPC2006-10171
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