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Assessment of Local Wall Thinned Pipeline Under Combined Bending and Pressure

[+] Author Affiliations
D. J. Shim, J. B. Choi, Y. J. Kim

Sungkyunkwan University, Suwon, Korea

J. W. Kim, C. Y. Park

Korea Electric Power Research Institute, Daejon, Korea

Paper No. PVP2002-1318, pp. 125-130; 6 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • Fitness for Service Evaluations and Non-Linear Analysis
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4653-9
  • Copyright © 2002 by ASME


Failure of a pipeline due to local wall thinning is getting more attention in the nuclear power plant industry. Although guidelines such as ANSI/ASME B31G are still useful for assessing the integrity of a wall thinned pipeline, there are some limitations in these guidelines. For instance, these guidelines consider only pressure loading and thus neglect bending loading. However, most pipelines in nuclear power plants are subjected to internal pressure and bending moment due to dead-weight loads and seismic loads. Therefore, an assessment procedure for locally wall thinned pipeline subjected to combined loading is needed. In this paper, three-dimensional finite element (FE) analyses were performed to simulate full-scale pipe tests conducted for various shapes of wall thinned area under internal pressure and bending moment. Maximum moments based on ultimate stress (σu ) were obtained from FE results to predict the failure of the pipe. These results were compared with test results, which showed good agreement. Additional finite element analyses were performed to investigate the effect of key parameters, such as wall thinned depth, wall thinned angle and wall thinned length, on maximum moment. Also, the effect of internal pressure on maximum moment was investigated. Change of internal pressure did not show significant effect oll the maximum moment.

Copyright © 2002 by ASME
Topics: Pressure , Pipelines



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