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Reconsideration of the Allowable Local Thickness of Straight Pipes in ASME CC N-597

[+] Author Affiliations
Jai Hak Park

Chungbuk National University, Chungbuk, Korea

Kyu In Shin

Chung Ahn University, Seoul, Korea

Chi Yong Park, Sung Ho Lee, Tae Ryong Kim

Korea Electric Power Research Institute, Daejun, Korea

Paper No. PVP2006-ICPVT-11-93493, pp. 523-530; 8 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 1: Codes and Standards
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4752-7 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


It becomes a hot issue to assess the structural integrity of thin-walled pipes and pipe items. ASME Section XI Code Case N597-2 [1] provides a criterion for acceptance of the pipes. But the code has several limitations for application and sometimes gives too conservative or non-conservative results. So works are in progress to modify and extend the code. For that purpose it is necessary to understand fully the technical bases of the code. In this paper technical bases were explained and the equations in the code were derived for the allowable local thickness of straight pipes. In N-597 code, the allowable local thickness of a thinned straight pipe is given for three different methods. Because of the different technical base, each method gives different thickness values and sometimes gives contradictory values. So in this paper attempts were made in order to propose a unified rule for the allowable local thickness and in order to remove or relax the restrictions on the application of the code. For this purpose elastic stress analyses were made using the finite element method and the stress results were examined. Based on the obtained bending stress results, a very simple procedure was proposed to obtain the consistent allowable local thickness for the thinned straight pipes.

Copyright © 2006 by ASME
Topics: Pipes , Thickness



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