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Proximity Rules for Subsurface Transforming to Surface Flaws for Class 1 Ferritic Vessels

[+] Author Affiliations
Kunio Hasegawa

Hitachi, Ltd, Hitashi-shi, Japan

Katsumasa Miyazaki

Hitachi, Ltd., Hitashi-shi, Japan

Douglas A. Scarth

Kinectrics, Inc., Toronto, Canada

Russell C. Cipolla

Aptech Engineering Services, Inc., Sunnyvale, CA

Paper No. PVP2006-ICPVT-11-93102, pp. 11-18; 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


There is a rule in Acceptance Standards of Class 1 ferritic vessel in the ASME B&PV Code Section XI describing that allowable subsurface flaws near a component surface are transformed to allowable surface flaws. This is the proximity rule for the subsurface flaws. Allowable sizes of the subsurface flaws decrease with proximity to the component surface. Therefore, a subsurface flaw allowed in the component is not allowed if the same size subsurface flaw is slightly closer to the component surface. However, if the subsurface flaw with the same size is located closer to the component surface, the subsurface flaw not allowed close to the component surface is acceptable after transforming it to a surface flaw. This is a discontinuity of a subsurface flaw. This paper describes the discontinuity problems of the subsurface flaws transforming to surface flaws and proposes a new flaw-to-surface factor of proximity rule, minimizing the influence of the current allowable flaw sizes in the Acceptance Standards.

Copyright © 2006 by ASME
Topics: Vessels



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