When external cracks are discovered on underground pipelines, it is sometimes difficult to identify the cracking mechanism. This is especially true when the cracking coincides with local stress discontinuities such as dents, where significant stress fluctuations can occur. Additionally, cracking may initiate by one mechanism and another mechanism may subsequently dominate. For purposes of developing integrity programs for the affected pipeline segment, proper interpretation of the mechanism for crack formation is important. This paper describes the characteristics of, and methods to distinguish between, the common types of time-dependent cracking found on underground pipelines. It also discusses the relationships between the mechanisms for the environmentally assisted cracking phenomena.
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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
Interpretation of External Cracking on Underground Pipelines
Clifford J. Maier,
Clifford J. Maier
CC Technologies Canada, Ltd., Calgary, AB, Canada
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John A. Beavers,
John A. Beavers
CC Technologies, Inc., Dublin, OH
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Taylor M. Shie,
Taylor M. Shie
CC Technologies, Inc., Dublin, OH
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Patrick H. Vieth
Patrick H. Vieth
CC Technologies, Inc., Dublin, OH
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Clifford J. Maier
CC Technologies Canada, Ltd., Calgary, AB, Canada
John A. Beavers
CC Technologies, Inc., Dublin, OH
Taylor M. Shie
CC Technologies, Inc., Dublin, OH
Patrick H. Vieth
CC Technologies, Inc., Dublin, OH
Paper No:
IPC2006-10176, pp. 289-296; 8 pages
Published Online:
October 2, 2008
Citation
Maier, CJ, Beavers, JA, Shie, TM, & Vieth, PH. "Interpretation of External Cracking on Underground 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. 289-296. ASME. https://doi.org/10.1115/IPC2006-10176
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