In ASME Section XI Appendix C for analytical evaluation of flaws in piping, a screening procedure is prescribed to determine the failure mode and analysis method for the flawed pipe. The end-of-evaluation period flaw dimensions, temperature, material properties, and pipe loadings are considered in the screening procedure. Equations necessary to calculate components of the screening criteria (SC) include stress intensity factor (K) equations. The K-equation for a pipe with a circumferential inside surface flaw in the 2017 Edition Section XI Appendix C-4000 is for a fan-shaped flaw. Real surface flaws are closer to semi-elliptical shape. As part of Section XI Working Group on Pipe Flaw Evaluation (WGPFE) activities, revision to stress intensity factor equations for circumferential surface flaws in Appendix C-4000 has been proposed. The proposed equations include closed-form equations for stress intensity influence coefficients G0 for membrane stress and Ggb for global bending stress for circumferential inside surface flaws. The rationale for the Code changes and technical basis for the proposed stress intensity factor equations are provided in this paper.
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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5158-6
PROCEEDINGS PAPER
Revision to Stress Intensity Factor Equations for ASME Section XI Appendix C-4000: Determination of Failure Mode
Kiminobu Hojo,
Kiminobu Hojo
Mitsubishi Heavy Industries Ltd., Kobe, Japan
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Steven Xu
Steven Xu
Kinectrics Inc., Toronto, ON, Canada
Search for other works by this author on:
Kiminobu Hojo
Mitsubishi Heavy Industries Ltd., Kobe, Japan
Steven Xu
Kinectrics Inc., Toronto, ON, Canada
Paper No:
PVP2018-85051, V01AT01A011; 8 pages
Published Online:
October 26, 2018
Citation
Hojo, K, & Xu, S. "Revision to Stress Intensity Factor Equations for ASME Section XI Appendix C-4000: Determination of Failure Mode." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 1A: Codes and Standards. Prague, Czech Republic. July 15–20, 2018. V01AT01A011. ASME. https://doi.org/10.1115/PVP2018-85051
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