The results of four full-scale burst tests conducted at the test site in Denmark were reported and the required fracture toughness for arrest was discussed for the X80 pipeline used for rich-gas transmission under ultra-high pressure (defined as greater than a 15 MPa internal pressure). The ductile crack arrest behavior was evaluated for buried using well-compacted sand and unburied conditions. The initial internal pressure of the tests was approximately 18.4 and 16.2 MPa corresponding to hoop stress of 400 and 350 MPa (72% SMYS and 64% SMYS), respectively. Natural gas that consisting of 89∼90 mol % methane and the balance being heavier hydrocarbons that give the rich-gas compositions was used for the burst tests. The outer diameters of the tested pipes were 762 mm (30-inch) and 610 mm (24-inch). The velocities of the propagated ductile cracks and the rich-gas decompression were determined from the data measured at the sampling rate of 25 kHz. Based on these test results, the required Charpy v-notch impact energy (vE energy) was used as a measure of the fracture resistance for arrest of the ductile propagating cracks evaluated under different backfill depth conditions. The applicability of the Battelle Two-Curve (BTC) approach was also investigated.
- International Petroleum Technology Institute and the Pipeline Division
Full-Scale Burst Tests of Ultra-High Pressured Rich-Gas Pipelines Under Buried and Unburied Conditions
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Kawaguchi, S, Murai, K, Hashimoto, Y, Hagiwara, N, Yajima, H, & Toyoda, M. "Full-Scale Burst Tests of Ultra-High Pressured Rich-Gas Pipelines Under Buried and Unburied Conditions." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 327-336. ASME. https://doi.org/10.1115/IPC2008-64434
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