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New Code Case to Substitute the Allowable Crack Angle in Rules on Fitness-for-Service

[+] Author Affiliations
Hideo Machida

TEPCO Systems Corporation, Tokyo, Japan

Koichi Kashima

CRIEPI, Komae-shi, Tokyo, Japan

Paper No. PVP2006-ICPVT-11-93542, pp. 407-414; 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


This paper is a technical basis document of the new Code Case to substitute the allowable crack angle for a circumferential surface crack in “Rules on Fitness-for-Service (FFS)” published from The Japan Society of Mechanical Engineers (JSME). Until now, the angle of a circumferential surface crack was limited below 60°. This is the limitation with consideration to the stability of the crack if the crack penetrates wall of the pipe. Therefore, a long crack (such like an SCC) was obliged to repair or replace even if it was shallow enough. Weld Overlay (WOL) repair—strength of the original piping is not expected in it—is also inapplicable for the same reason. In order to solve this irrationality, the new Code Case applying to the crack stability assessment when the crack angle exceeds 60° was established, and allowable crack depth according to the crack angle were defined in it.

Copyright © 2006 by ASME



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