Verification of structural discontinuity distance of Fitness-For-Service

DOI

Bibliographic Information

Other Title
  • 減肉に対する FFS 評価における構造不連続部距離規定の検証

Abstract

API579-1/ASME FFS-1 Fitness-for-Service Part 4 and Part 5 Lv.1 and Lv.2 as well as WES 2820 metal loss assessment procedure requires a certain dis-tance from a major stress discontinuity. It limits the FFS assessment often, however, the definition of major structural discontinuities shown in API579-1/ASME FFS-1 Part 4 and Part 5 as well as WES 2820 metal assessment is qualitative. Also, current requirement is based on Timoshenko’s model that assumed an external force and moment working on the surface of cylinder while some of “major structural discontinuity” would not take a significant force and moment. Improving the definition of “major structural discontinuity” would increase the application slot of API579-1/ASME FFS-1 Part 4 and Part 5 Lv.1 and Lv.2 assessment as well as WES 2820 metal loss assessment. In this paper, the remaining strength of pressure vessels with a locally thin area located around structural discontinuities is obtained and discussed for several typical cases, such as 2:1 elliptical head, hemisphere head and stiffening ring, based on the significance of surface correction factor Ms. The result indicated if the cross section of major structural discontinuity was sufficient and no working force and moment on it, it would not affect the remaining strength of pressure boundary.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390299307004733824
  • DOI
    10.11181/hpi.62.37
  • ISSN
    13479598
    03870154
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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