Coating disbondment on pipelines is a common phenomenon that leads to exposure of the pipeline metal to ground water solutions, promoting a corrosive environment which is associated with stress corrosion cracking (SCC). This investigation tracks the corrosion behavior of X-65 steel at different coating disbondments at Open Circuit Potential (OCP) conditions through weight loss tests, as well as SEM analysis. For the weight loss test, X-65 coupons were placed into a vertical coupon holder with varying gap sizes between the coupons and the shielding (2 mm 5 mm, and 10 mm) simulating the coating disbondment. The results of the tests suggest that the corrosion rate inside the gap is dependent on the mass transfer rate of CO2. For larger gaps, the corrosion rate inside the gap decreases almost linearly with position (highest at the top of the disbondment) and is dependent on the iron carbonate film deposition. For smaller gaps (≤5 mm) a galvanic effect was observed between the coupons at the top of the disbondment (anodic) which showed a high degree of general corrosion, and the coupons at the bottom of the disbondment (cathodic) which had very low corrosion rates. The experimental observations were related to the corrosion scenarios found in the field. Cathodic protection strategies with respect to the geometry of disbondment are also discussed.
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2012 9th International Pipeline Conference
September 24–28, 2012
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute
- Pipeline Division
ISBN:
978-0-7918-4513-4
PROCEEDINGS PAPER
Developing Cathodic Protection Based on Disbondment Geometry Available to Purchase
Karina Chevil,
Karina Chevil
University of Alberta, Edmonton, AB, Canada
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Abdoulmajid Eslami,
Abdoulmajid Eslami
University of Alberta, Edmonton, AB, Canada
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Weixing Chen,
Weixing Chen
University of Alberta, Edmonton, AB, Canada
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Reg Eadie,
Reg Eadie
University of Alberta, Edmonton, AB, Canada
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Richard Kania,
Richard Kania
TransCanada Pipelines Ltd., Calgary, AB, Canada
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Robert Worthingham,
Robert Worthingham
Worthingham Professional Services Inc., Calgary, AB, Canada
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Greg Van Boven
Greg Van Boven
Spectra Energy Transmission, Vancouver, BC, Canada
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Karina Chevil
University of Alberta, Edmonton, AB, Canada
Abdoulmajid Eslami
University of Alberta, Edmonton, AB, Canada
Weixing Chen
University of Alberta, Edmonton, AB, Canada
Reg Eadie
University of Alberta, Edmonton, AB, Canada
Richard Kania
TransCanada Pipelines Ltd., Calgary, AB, Canada
Robert Worthingham
Worthingham Professional Services Inc., Calgary, AB, Canada
Greg Van Boven
Spectra Energy Transmission, Vancouver, BC, Canada
Paper No:
IPC2012-90675, pp. 583-590; 8 pages
Published Online:
July 25, 2013
Citation
Chevil, K, Eslami, A, Chen, W, Eadie, R, Kania, R, Worthingham, R, & Van Boven, G. "Developing Cathodic Protection Based on Disbondment Geometry." Proceedings of the 2012 9th International Pipeline Conference. Volume 2: Pipeline Integrity Management. Calgary, Alberta, Canada. September 24–28, 2012. pp. 583-590. ASME. https://doi.org/10.1115/IPC2012-90675
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