One proposed method for preventing the initiation of SCC on pipelines is through the use of high-performance coatings in conjunction with effective cathodic protection. High-performance coatings include fusion bonded epoxy (FBE), urethanes, liquid epoxies, extruded polyethylene, and multi-layer coatings. This paper reports the results of a CEPA-sponsored project to determine the long-term performance of FBE coatings on underground pipelines using in situ field measurements. The barrier properties of FBE coatings were measured after several years field service using Electrochemical Impedance Spectroscopy (EIS). Measurements were made on four FBE-coated pipelines that had been exposed for periods of between 5 and 20 years. The coatings studied included three different formulations from two different manufacturers. A variety of site, soil and CP conditions were also examined. The combination of EIS measurements and analyses of trapped water samples demonstrated that the FBE coatings continued to perform well after having been exposed for up to 20 years. Although some blistering and disbondment was observed in some cases as a result of poor application and storage procedures, in all cases the pipe surface was still protected either by the coating itself or by the joint action of the CP system and the CP-compatible FBE coating. The results of this study provide strong evidence that FBE-coated pipelines should not be susceptible to the initiation of SCC, due to (i) the barrier properties of the coating, (ii) the CP-compatible nature of the coating, and (iii) good surface preparation techniques that involve the removal of millscale and the introduction of compressive surface residual stresses.
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2002 4th International Pipeline Conference
September 29–October 3, 2002
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-3620-7
PROCEEDINGS PAPER
Field Assessment of FBE-Coated Pipelines and the Implications for Stress Corrosion Cracking Available to Purchase
Fraser King,
Fraser King
NOVA Research & Technology Centre, Calgary, AB, Canada
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Yufeng Cheng,
Yufeng Cheng
NOVA Research & Technology Centre, Calgary, AB, Canada
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Linda Gray,
Linda Gray
KTA-Tator (Canada), Inc., Edmonton, AB, Canada
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Brent Drader,
Brent Drader
KTA-Tator (Canada), Inc., Edmonton, AB, Canada
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Robert Sutherby
Robert Sutherby
CEPA/TransCanada Pipelines, Calgary, AB, Canada
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Fraser King
NOVA Research & Technology Centre, Calgary, AB, Canada
Yufeng Cheng
NOVA Research & Technology Centre, Calgary, AB, Canada
Linda Gray
KTA-Tator (Canada), Inc., Edmonton, AB, Canada
Brent Drader
KTA-Tator (Canada), Inc., Edmonton, AB, Canada
Robert Sutherby
CEPA/TransCanada Pipelines, Calgary, AB, Canada
Paper No:
IPC2002-27100, pp. 1619-1628; 10 pages
Published Online:
February 24, 2009
Citation
King, F, Cheng, Y, Gray, L, Drader, B, & Sutherby, R. "Field Assessment of FBE-Coated Pipelines and the Implications for Stress Corrosion Cracking." Proceedings of the 2002 4th International Pipeline Conference. 4th International Pipeline Conference, Parts A and B. Calgary, Alberta, Canada. September 29–October 3, 2002. pp. 1619-1628. ASME. https://doi.org/10.1115/IPC2002-27100
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