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Effects of Nut Thinning due to Corrosion on the Strength Characteristics and the Sealing Performance of Bolted Flange Joints Under Internal Pressure

[+] Author Affiliations
Tsutomu Kikuchi

Idemitsu Kousan Co., Ltd., Chiba, Japan

Yuya Omiya, Toshiyuki Sawa

University of Hiroshima, Higashihiroshima, Hiroshima, Japan

Paper No. PVP2011-57445, pp. 35-41; 7 pages
doi:10.1115/PVP2011-57445
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4452-6
  • Copyright © 2011 by ASME

abstract

The effects of nut thinning due to corrosion on the strength characteristic and the sealing performance in 3B bolted flange joints under internal pressure are examined from both FEM calculations and experiments. The following results are obtained. When bolts and nuts in a bolted flange joint are tightened with 50% of yield stress, no yield region at the engaged screw thread occurs, however, when they arc tightened with 90% of the yield stress, a small scale yield region occurs at the roots of the engaged three screw threads from the bearing surface of the nut. While verifying this phenomenon using FEM, it was newly discovered that when the height of the nut was reduced to 1/3 (equivalent to approximately two threads) of the original dimensions according to the standards, the sealing performance could no longer be assured.

Copyright © 2011 by ASME

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