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Establishment of method to suppress leakage from gasketed bolted flange connections subjected to combined load under elevated temperature

Research Project

Project/Area Number 17K06134
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionNumazu National College of Technology

Principal Investigator

KOBAYASHI Takashi  沼津工業高等専門学校, 機械工学科, 教授 (10161994)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsガスケット / フランジ締結体 / 漏えい / 複合荷重 / 高温 / 漏えい防止
Outline of Final Research Achievements

Firstly, the loading conditions that cause large leakage from gasketed flange connections when subjected to combined loads of axial load and bending moment are examined experimentally. The experimental equation that represents the sealing limits is proposed. Secondly, the minimum gasket stress to maintain the tightness of bolted flange connections under the combined loads is analyzed using the finite element method.
Summarizing the experimental and analytical results, it is found that large leakage occurs when the gasket stress at the outer circumference becomes lower than the critical gasket stress. If sufficiently high initial bolt tightening forces are given to obtain high tightness of the flanged connections, the flanged connections is resilient under combined loads that causes yield in the pipes used in the flanged connections.

Academic Significance and Societal Importance of the Research Achievements

化学プラントなど配管系のガスケット付きフランジ締結体は、温度変化による配管の熱膨張・収縮による配管軸方向の荷重に加えて、自重や地震などによる曲げ荷重も考慮する必要がある。本研究により、フランジ締結体の組立て時に初期の密封性能が得られる十分高いボルト締付け力を与えれば、その後配管に塑性変形が生じるような大きな複合荷重が作用しても、大規模な漏えいが発生する可能性は低いことが明らかになった。このことは、現状使用されているフランジ締結体の安全性を裏付けする結果であり、実用上の観点から意義は大きいといえる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2019 2018

All Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Consideration on the Minimum Gasket Stress to Maintain Sealability of Bolted Flanged Connections Subjected to External Bending Moment2019

    • Author(s)
      Takashi KOBAYASHI
    • Organizer
      American Society of Mechanical Engineers, PVP 2019 Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 曲げモーメントを受けるフランジ締結体のガスケット応力解析2019

    • Author(s)
      小林隆志,野木遼亮
    • Organizer
      日本機械学会 山梨講演会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 曲げと引張りの複合荷重を受けるフランジ締結体の密封特性の簡易推定法2019

    • Author(s)
      小林隆志,野木遼亮,渡瀬慎之輔
    • Organizer
      日本機械学会 山梨講演会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 曲げモーメントを受けるフランジ締結体の密封特性(ボルト位置の影響)2019

    • Author(s)
      小林隆志,佐野笙太郎,野木遼亮
    • Organizer
      日本機械学会 山梨講演会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] マスフローメータを用いた配管フランジ締結体の漏えい開始の測定2018

    • Author(s)
      小林隆志,野木遼亮
    • Organizer
      日本機械学会 山梨講演会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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