Analysis of composite repair methods for pipeline mechanical damages subjected to cyclic loading
- Stress Engineering Services, Inc., Houston, TX (United States)
- Gas Research Inst., Chicago, IL (United States)
In service mechanical damage occurring on operating transmission pipelines can induce leakage and eventual failure. Considering that there are approximately 250,000 miles of domestic gas pipelines, repair of these anomalies results in significant costs to the industry. This paper describes a research project sponsored by the Gas Research Institute to determine the capabilities of a composite based assembly designed as an alternative to steel sleeves. This system was evaluated as a repair for mechanical dents and gouges on line pipe with D/t ratios of 51, 68 and 96. The composite wraps were placed over mechanical defects consisting of dents 15% of the diameter and gouge depths of 15, 30, and 50% of the wall thickness. Internal pressures were cycled from 0--50% MAOP and 50--100% MAOP. Results indicate that sharp axial defects in the pipe can be successfully reinforced if they are first blunted by grinding to remove the stress concentrators. The repair system increases fatigue life by 2 to 5 times over those dents with gouges that were not ground.
- OSTI ID:
- 460683
- Report Number(s):
- CONF-970146-; ISBN 1-890277-01-0; TRN: IM9718%%265
- Resource Relation:
- Conference: Energy week `97 conference & exhibition, Houston, TX (United States), 28-30 Jan 1997; Other Information: PBD: 1997; Related Information: Is Part Of 8. annual international energy week conference and exhibition: Conference papers. Book 2: Pipelines, terminals and storage; Processing and refining; PB: 284 p.
- Country of Publication:
- United States
- Language:
- English
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