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Axi-Symmetric Stress Analysis and Determination of Bolt Preload in Bolted Flange Connections With Cover of Pressure Vessel Subjected to Internal Pressure

[+] Author Affiliations
Toshiyuki Sawa

Hiroshima University, Higashihiroshima, Hiroshima, Japan

Satoshi Nagata

Toyo Engineering Corporation, Narashino, Chiba, Japan

Yosuke Akita

Hiroshima University, Hiroshima, Japan

Paper No. PVP2005-71425, pp. 105-113; 9 pages
doi:10.1115/PVP2005-71425
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4187-1 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

The stresses of a bolted flange connection with a cover of pressure vessel (CPV) in which a spiral wound gasket is inserted, under internal pressure are analyzed taking account a hysteresis of the gasket using the axi-symmetrical theory of elasticity as a three-body contact problem. In addition, for the verification of the analyses, finite-element calculations were also done. The Leakage tests were conducted for an actual bolted flange connection with a CPV and a spiral wound gasket. Using the calculated contact gasket stress distribution of the bolted flange connection with the CPV under internal pressure and the tightness parameter, the values of the new gasket constants were obtained by taking into account the changes in the contact gasket stress. A difference in the new gasket constants between the estimated values obtained from the actual bolted flange connection with the CPV and the values obtained by the PVRC procedure was small. In addition, a method to determine the bolt preload for a given tightness parameter was demonstrated. The obtained results of the bolt preload for the bolted flange connection with the CPV were in a fairly good agreement with those obtained by the PVRC procedure under a lower pressure application. However, a difference in the bolt preload was about 7% when the given tightness parameter was increased.

Copyright © 2005 by ASME

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