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Combination Rules for External Volumetric Flaws in a Pressurised Cylinder Subject to External Bending

[+] Author Affiliations
B. Bezensek, L. Duguid

University of Glasgow, Glasgow, Scotland, UK

Paper No. PVP2008-61293, pp. 1033-1040; 8 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


The pressure-moment (p-M) diagram of Konosu [1, 2] provides an inexpensive method for evaluating fitness for service of internally pressurised cylinders containing volumetric flaws (local thin areas) subject to external bending moment. This work examines the use of the recommended flaw combination rules for volumetric flaws of the ASME Boiler and Pressure vessel code Section XI [3] and Ibaraki fitness-for-service code [4] with the pressure–moment method. Investigation is performed for a thin-wall vessel containing two external volumetric flaws with flaw depths ranging from 25 to 75 percent of the wall thickness under a range of internal pressures. Assessment based on the plastic initiation moments shows that the adjacent flaws are conservatively assessed as single flaws using the above codes’ rules when flaw depths of both flaws do not exceed 60 percent of the wall thickness. This restriction is relaxed to 75 percent of the wall thickness when assessment is performed using the twice elastic slope (TES) collapse moments.

Copyright © 2008 by ASME
Topics: Cylinders



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