Both fusion bonded epoxy (FBE) and 3-layer polyolefin (3LPO) coating systems have been widely applied in the world as new-construction external pipeline coatings. 3LPO is regarded as a more damage resistant coating system while FBE is considered to be more compatible with the CP system. In the past few years, several incidences of coating disbondment at the FBE-steel interface of 3LPO have been reported in the literature. The coating disbondment issue has raised concerns over the use of 3LPO. The US Department of Transportation (DOT) initiated a research program to address these technical concerns. Our research program is funded by this DOT initiative with a team of pipeline coating experts participating in this research project. The integrity of the 3LPO pipeline coating is impacted by the residual stresses and adhesion degradation by water penetration. This paper examines the effect of coating thickness on residual stress, degradation of adhesion due to immersion in hot water and their combined affect on disbondment. The integrity of 3LPO is good when the coating is applied properly. Under the following conditions, the 3LPO may delaminate: (1) inadequate FBE coating formulation, (2) inadequate FBE coating application procedure and surface preparation, and (3) induced stress due to high volume shrinkage of PO layer.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4858-6
PROCEEDINGS PAPER
Integrity of 3LPE Pipeline Coatings: Residual Stresses and Adhesion Degradation
Benjamin T. A. Chang,
Benjamin T. A. Chang
PolyLab LLC, Houston, TX
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Hung-Jue Sue,
Hung-Jue Sue
Texas A/M University, College Station, TX
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Han Jiang,
Han Jiang
Texas A/M University, College Station, TX
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Bobby Browning,
Bobby Browning
Texas A/M University, College Station, TX
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Dennis Wong,
Dennis Wong
ShawCor, Toronto, Ontario, Canada
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William Snider,
William Snider
Tuboscope, NOV, Houston, TX
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Al Siegmund
Al Siegmund
Tuboscope, NOV, Houston, TX
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Benjamin T. A. Chang
PolyLab LLC, Houston, TX
Hung-Jue Sue
Texas A/M University, College Station, TX
Han Jiang
Texas A/M University, College Station, TX
Bobby Browning
Texas A/M University, College Station, TX
Dennis Wong
ShawCor, Toronto, Ontario, Canada
Ha Pham
Dow Chemical, Freeport, TX
Shu Guo
Dow Chemical, Freeport, TX
Al Kehr
3M, Austin, TX
Meghan Mallozzi
3M, Austin, TX
William Snider
Tuboscope, NOV, Houston, TX
Al Siegmund
Tuboscope, NOV, Houston, TX
Paper No:
IPC2008-64048, pp. 75-86; 12 pages
Published Online:
June 29, 2009
Citation
Chang, BTA, Sue, H, Jiang, H, Browning, B, Wong, D, Pham, H, Guo, S, Kehr, A, Mallozzi, M, Snider, W, & Siegmund, A. "Integrity of 3LPE Pipeline Coatings: Residual Stresses and Adhesion Degradation." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 75-86. ASME. https://doi.org/10.1115/IPC2008-64048
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