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Determination of Optimum Ambient Temperature Re-Torque Dwell Period for PTFE Based Gaskets

[+] Author Affiliations
Alfred F. Waterland, III

Virginia Sealing Products, Inc., Hopewell, VA

James E. B. Frew

Virginia Sealing Products, Inc., Kingsport, TN

Paper No. PVP2006-ICPVT-11-93088, pp. 93-101; 9 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


Gaskets must receive adequate, minimum assembly stress in order to develop the required level of joint tightness. Furthermore, operating stress levels must be maintained above a certain threshold throughout the service life of the connection in order to insure continued joint reliability and tightness (low leakage) performance. PTFE based gasket materials can exhibit significant initial and/or continued compressive flow, which translates into a loss of bolt load. Manufacturers and users of PTFE based gasket materials are advised to re-torque these connections, often after a 24 hour dwell period. The following research was conducted in order to determine if the specific PTFE material selected can influence the need for bolt re-torque, and additionally to determine if the re-torque dwell period can be reduced to a time period less than 24 hours.

Copyright © 2006 by ASME
Topics: Torque , Temperature , Gaskets



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