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Sufficiency of Reference Stress Solutions for FFS Evaluation of Crack-Like Flaws

[+] Author Affiliations
Kenji Oyamada

High Pressure Gas Safety Institute of Japan (KHK), Tokyo, Japan

Naoki Miura

Central Research Institute of Electric Power Industry, Nagasaka, Japan

Paper No. PVP2017-65715, pp. V03BT03A019; 11 pages
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 3B: Design and Analysis
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5795-3
  • Copyright © 2017 by ASME


In Japan, a new standard of an assessment procedure for crack-like flaws in pressure equipment at elevated temperature is now under development in the High Pressure Institute of Japan (HPI). In this standard development, it is needed to adopt reference stress solutions for crack-like flaws in pressure equipment being subjected to membrane stress and/or bending stress. Such reference stress solutions have been proposed in various references such as ASME FFS-1/API579-1, BS7910, R5, FBR draft guideline, HPIS Z101-2, etc.

A comparative study of those reference stress solutions was conducted in order to select appropriate one. As a result, reference stress solutions in HPIS Z101-2 were adopted. The sufficiency of adopted reference stress solutions was introduced in this paper.

Also, the reference stress solutions for axially and circumferentially through-wall rectangular flawed cylinders, which were not provided in the HPIS Z101-2 standard but were utilized to derive those solutions adopted in the standard, were introduced in this paper. These solutions should be adopted in a new HPI standard for crack-like flaws in pressure equipment at elevated temperature.

Copyright © 2017 by ASME



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