Burst Failure Analysis of a HFW Pipe for Nature Gas Pipeline

Abstract:

The burst failure of a high frequency welded (HFW) pipe used for nature gas pipeline in an oilfield was analyzed systematically by macro analysis, physical and chemical property test, scanning electron microscope (SEM), etc., and the limit internal pressure of the pipeline under operation condition was predicted based on finite element method (FEM). The results showed that the chemical composition and mechanical properties of the pipe meet the requirements of relevant standards. The failure results showed that the dent damage of the straight pipe section was at 12 o'clock. In the service of the pipeline, the stress in the dent area exceeds the yield strength, which leads to the plastic deformation of the pipeline, resulting in necking and thinning, and the reduction of wall thickness further leads to the decrease of ultimate internal pressure, until the ultimate bearing capacity of the dent area is less than the internal pressure of pipeline operation, resulting in burst. It is suggested to strengthen the supervision of pipeline construction to avoid the pipeline dent damage. Meanwhile, the operation monitoring of the pipeline with dent damage should be strengthened, and timely repair or depressurization operation should be carried out if necessary.

• Periodical: Materials Science Forum (Volume 1035)
• Pages: 473-479
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1035.473
• Online since: June 2021
• Authors: Li Xia Zhu*, Gang Wu, Jin Heng Luo, Zhen Quan Bai
• Keywords: Burst, Dent, Limit Internal Pressure, Pipeline Steel, Plastic Deformation

References

[1] Yang Qiong, Shuai Jian, Zuo Shangzhi. Research actuality of pipelines with dents [J].Oil & Gas Storage and Transportation, 2009, 28(6): 10-15.

[2] J. Dawson S, A. Russell, A. Patterson. Emerging Techniques for Enhanced Assessment and Analysis of Dents [J]. Journal of Pipeline Engineering, 2008, 7(3): 189-204.

[3] Gao Dengkui. Research on In-line inspection technology for mechanical demage in pipelines [D]. ShenYang: Shenyang University of Technology, (2006).

[4] API. Effects of smooth and rock dents on liquid petroleum pipelines (phase ii) first edition: API PUBL 1156-1999[S]. USA: API, (1999).

[5] ASME. Gas Transmission and Distribution Piping Systems: ASME B31.8-2007[S]. USA: ASME, (2007).

[6] Canadian Standards Association. Oil and gas pipeline systems: CSA Z662-2007[S]. Canada: Canadian Standards Association, (2007).

DOI: 10.1115/ipc2022-88266

[7] National Standardization Administration of China. Petroleum and natural gas industries—Steel pipe for pipeline transportation systems: GB/T 9711-2017[S].