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| Failure determination of polyurea coated oil and gas pipelines with local defects under blast load |
| CUI Ying1,2, LI Zhangjian2,3, FANG Jun2,3, ZHAO Junhai4, QU Zhan1,2, ZHAO Ben2,3 |
| 1. School of Civil Engineering, Xi’an Shiyou University, Xi’an 710065, China;
2. The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and
Gas Reservoir of Shaanxi Province, Xi’an 710065, China;
3. School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, China;
4. School of Civil Engineering, Chang’an University, Xi’an 710061, China |
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Abstract With buried blast experiment, the anti-explosion performance of polyurea elastic reinforcement buried petroleum pipeline with localized defects was researched thoroughly. Furthermore, with the experimental data and numerical simulation, the damage assessment criterion of polyurea elastic reinforcement buried petroleum pipeline with localized defects subjected to shallow buried blast loading was established. The results show that under the condition of scale distance of 0.23m/kg1/3 and shallow buried blast loading exerted on, there were obvious dent deformations on the surface facing the blasting of the normal buried pipeline with localized defects and the polyurea buried petroleum pipeline with localized defects both, and the dent deformation values of the polyurea pipeline with localized defects was 28.87% lower than that of the normal buried pipeline. It was venerable to have damage on the buried pipeline surface facing explosive and joint ends of buried pipeline. According to the comparison of the overpressure, the values of the normal buried pipeline with localized defects was higher than that of the polyurea enhanced one, and the beginning time of deformation of the normal buried pipeline with localized defects was earlier than that of the polyurea enhanced one, which indicated that the polyurea could decrease the value of overpressure and delay the response time effectively. Finally, considering the calculation of cross-section ellipticity of pipeline cross-section deformation for failure determination, the damage assessment formula based on a new critical ellipticity of pipeline cross-section had been established according to pressure and impulse (P-I) damage assessment theory.
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Received: 26 July 2023
Published: 15 May 2024
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