It has been well known that the scatter in axial bolt forces of bolted flange connections tightened by torque control methods is substantial. In evaluating the sealing performance of a bolted flange connection with a gasket subjected to internal pressure, it is necessary to know the contact gasket stress distributions due to the scatter of the axial bolt forces in the flange connections tightened by torque control methods. This paper deals with the leakage of a bolted flange connection with a cover of pressure vessel including a spiral wound gasket tightened by a torque wrench. The scatter in the axial bolt forces was measured using strain gauges attached at the shank of bolts. The amount of leakage from the bolted flange connection with cover of pressure vessel was measured by so-called pressure decay method. The gas employed was Helium. From the measured leakage, the actual assembly efficiency is examined. The eight bolts and nuts were tightened according to the ASME PCC-1 method and Japanese method developed by High Pressure Institute (HPI). The difference in the bolt preload was shown between the ASME method and the HPI method. The contact gasket stress distributions at the interface of the flange connection with the gasket were calculated under the measured axial bolt forces by means of finite element analysis. Using the calculated gasket contact stress distribution, the amount of gas leakage was estimated. The estimated gas leakage was compared with the measured results.
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ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
July 23–27, 2006
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4753-5
PROCEEDINGS PAPER
Effects of Scatter in Bolt Preload on the Sealing Performance in Bolted Flange Connections With Cover of Pressure Vessel Under Internal Pressure
Satoshi Nagata,
Satoshi Nagata
Toyo Engineering Corporation, Narashino, Chiba, Japan
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Toshiyuki Sawa,
Toshiyuki Sawa
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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Seiichi Hamamoto
Seiichi Hamamoto
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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Satoshi Nagata
Toyo Engineering Corporation, Narashino, Chiba, Japan
Toshiyuki Sawa
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
Seiichi Hamamoto
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
Paper No:
PVP2006-ICPVT-11-93538, pp. 241-246; 6 pages
Published Online:
July 23, 2008
Citation
Nagata, S, Sawa, T, & Hamamoto, S. "Effects of Scatter in Bolt Preload on the Sealing Performance in Bolted Flange Connections With Cover of Pressure Vessel Under Internal Pressure." Proceedings of the ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Volume 2: Computer Technology. Vancouver, BC, Canada. July 23–27, 2006. pp. 241-246. ASME. https://doi.org/10.1115/PVP2006-ICPVT-11-93538
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