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New Tightening Diagram for Bolted Flange Gasket Joints

[+] Author Affiliations
Yoshio Ueno

Kowa-Kogyosho, Nagoya, Japan

Satoshi Nagata

Toyo Engineering Corporation, Narashino, Chiba, Japan

Takashi Kobayashi

Numazu College of Technology, Numazu, Shizuoka, Japan

Toshiyuki Sawa

Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan

Paper No. PVP2006-ICPVT-11-93541, pp. 247-254; 8 pages
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 2: Computer Technology
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4753-5 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME


Tightening diagrams have been well known and utilized to the design of bolted joints in wide applications. The tightening diagram is conceptually illustrated by using two lines. One represents the relationship between the bolt force and the bolt elongation, the other represents that of the clamping force and the compressive displacement of the clamped body. The tightening diagram also gives the changes of the bolt force and the compressive force when an external force exerts on the bolted joints after assembled. However, the tightening diagrams have a limitation in application only for the joints without gaskets. The tightening diagram is not possible to apply directly to the bolted flange gasket joints since the joint do not behave as non-gasketed joints due to the gasket inserted and the configurations bolts locate outside the ring gasket. This paper proposes a new tightening diagram for bolted flange gasket joints. The new tightening diagram consists of mainly three lines. Two lines represent the displacement of flange at the gasket reaction point due to pressure thrust and gasket load, respectively. The remaining shows the loading-unloading curve of the gasket. By the combination of these lines, the behavior of bolted flange gasket joint is conceptually illustrated and the changes of the bolt force and the gasket load is shown. The paper gives a detailed explanation of the new tightening diagram.

Copyright © 2006 by ASME



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