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Title: Use Of Composites For Fracture Arrest In Low Toughness Pipe
Author: Michael m. Adkins
Source: American Gas Association 1993
Year Published: 1993
Abstract: Methods of controlling long-running, axial cracks in high pressure gas transmission piping have been studied during the past three decades. This work has led to the development of design requirements for transmission line pipe that provide self-arresting capability under pipeline operating conditions. The current practice for new pipelines is to employ line pipe with high impact strength over the planned operating temperature range. Older pipe may not have the necessary level of toughness and supplemental iiechanical arresters may be warranted. The performance of a fiberglass composite as crack arrest device for low toughness pipe was evaluated in this program. Clock Spring composite was found to provide arrest capabilities for ductile cracks and some brittle cracks generated by an explosive device in pipe pressurized with nitrogen to 72 percent SMYS. While some arrests were obtained, they were not reproducible at pipe wall temperatures where the low toughness resulted in multiple brittle cracks that branched during propagation.

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