Experimental and Numerical Study of Locally Reinforced Pipelines
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The safety of pipelines being repaired by local reinforcement methods such as welding a cap or patch is gaining attention. This paper describes experimental and numerical research conducted to assess loading capacity of these local reinforcement pipelines when subjected to internal pressure. Two full-scale hydrotests were performed on pipe sections removed from service. The strain variation and burst pressure were measured, and the strain concentrations and collapse loads were investigated. The results demonstrate that there is small difference between the two repaired pipe sections on the burst pressure. Strain output from both actual tests and finite element analyses shows that both repair methods do result in strain concentrations around the repair site, and that the patch method results in less strain variation and lower stress levels compared to the cap repair method.
KeywordsBurst test Locally reinforced pipeline Failure analysis Finite element analysis
The work included in this paper is supported by the National Key Sci-Tech Major Special Item of China, under Award No. 2011ZX05017-004.
- 2.API 570, Inspection, Repair, Alteration, and Rerating of In-service Piping Systems (API, Washington, 2006)Google Scholar
- 3.A. Keith Escoe, Piping and Pipelines Assessment Guide, Chap. 6, Repairs Involving Hot Work (Elsevier, Burlington, 2006), pp. 363–367Google Scholar
- 4.China National Petroleum Corporation, Repair Maintenance Technology Specification for Oil-Gas Pipeline, Q/SY 2012-43 (China National Petroleum Corporation, Beijing, 2012)Google Scholar
- 5.Evaluacion de las causas de tres fallas en gas pipeline norte, Report GIE 8-10/97 (Transportadora de Gas del Norte SA, Argentina, 1997)Google Scholar
- 6.J.F. Kiefner et al., Failure Analysis of Pipelines ASM Handbook (ASM, St Paul, 1997)Google Scholar
- 9.Inspection and Quarantine of PRC, Metallic Materials-Tensile Testing at Ambient Temperature, GB/T 228, General Administration of Quality Supervision (Inspection and Quarantine of PRC, Beijing, 2002)Google Scholar
- 10.X.K. Zhu, B.N. Leis, Strength criteria and analytic predictions of failure pressure in line pipes. Int. J. Offshore Polar 14, 125–131 (2004)Google Scholar
- 11.ASME, ASME Boiler and Pressure Vessel Code, Sect. III, Division 1 (ASME, New York, 2013)Google Scholar
- 12.ASME, ASME Boiler and Pressure Vessel Code, Sect. VIII, Division 2 (ASME, New York, 2004)Google Scholar
- 14.Abaqus/CAE User’s Manual, Version 6.12’ (Dassault Systèmes, Providence, 2012)Google Scholar