0
Research Papers: Experimental Work

Characterization of PTFE-Based Gaskets at High Temperature

[+] Author and Article Information
Abdel-Hakim Bouzid

Professor
Fellow ASME
Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
e-mail: hakim.bouzid@etsmtl.ca

Samir Benabdallah

Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
e-mail: samirbenabdallah5@gmail.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 27, 2014; final manuscript received January 21, 2015; published online March 25, 2015. Assoc. Editor: Wolf Reinhardt.

J. Pressure Vessel Technol 137(3), 031012 (Jun 01, 2015) (7 pages) Paper No: PVT-14-1099; doi: 10.1115/1.4029662 History: Received June 27, 2014; Revised January 21, 2015; Online March 25, 2015

The objective of this work is to analyze the hot blow-out test procedure (HOBT) used to determine the maximum operating temperature of Teflon-based gaskets. The study focuses on the effect of thermal cycles and a few considerations that can be made to improve the characterization procedure for better prediction of the long-term performance of these types of gaskets at high temperature. The determination of their safe operating temperature limit requires a good knowledge of their capacity to resist creep-relaxation due to temperature exposure in the short and long terms. The study investigates the effects of the cumulative gasket deformation due to thermal cycling, gasket stress level, and holding time on the relaxation of these materials. In parallel, an experimental fixture has been developed to measure the thermal expansion coefficient and the short-term creep resistance of such materials. Based on this study, the introduction of thermal cycling in the HOBT test procedure shows that ratcheting damage has some impact on the reduction of the gasket lower bound stress and therefore on the temperature limit of polytetrafluoroethylene (PTFE) gaskets. The effect of holding temperature for a short period of time is also investigated. The modified HOBT rig allows measurement of the gasket deflection during the test in order to accurately quantify the cumulative permanent deformation. Tests on small size PTFE-based gaskets are conducted to demonstrate the above mentioned effects.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Keywood, S., 1994, Testing and Evaluation of PTFE-Based Gaskets for Chemical Plant Service, 5th Annual Technical Symposium of the Fluid Sealing Association, Fort Lauderdale, FL.
Winter, J. R., and Keywood, S., 1996, “Investigation of Extrusion-Type Gasket Failures of PTFE-Based Gaskets in Pipe-Line Flanges,” ASME Pressure Vessels and Piping Division, Computer Technology—1996: Applications and Methodology, Montreal, Canada, Paper no. PVP v 326, pp. 35–46.
Derenne, M., Marchand, L., and Payne, J. R., 1999, Polytetrafluoroethylene (PTFE) Gasket Qualification, Vol. 442, Welding Research Council Bulletin, New York.
Savage, E., 1999, “Caractérisation en Température du Fluage-Relaxation des Joints d'Etanchéité à Base de PTFE,” M.Sc. thesis, Ecole Polytechnique of Montreal, Montréal, QC.
Bouzid, A., Derenne, M., Marchand, L., and Payne, J. R., 2000, “Preventing PTFE Gasket Blow-Out,” Ninth International Conference on Pressure Vessel Technology ICPVT-9, Operation, NDE, Failure Analysis, Codes, Standards and Regulations, Sydney, Australia, Vol. 2, pp. 393–401.
Bouzid, A., Derenne, M., Marchand, L., and Payne, J. R., 2001, “Service Temperature Characterization of Polytetrafluoroethylene Based Gaskets,” ASTM J. Test. Eval., 29(5), pp. 442–452. [CrossRef]
Bouzid, A., 2011, “ASTM F03 Research Project on Thermal Expansion Coefficient of PTFE Gasketing Materials Under High Loads,” ASTM International, Report No. F03-1039-CPMS, p. 39.
ASTM E 228-95, 2014, Standard Test Method for Linear Thermal Expansion of Solid Materials With Vitreous Silica Dilatometer, ASTM, West Conshohocken, PA.
ASTM E 831-93, 2014, Standard Test Method for Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis, ASTM, West Conshohocken, PA.
ASTM D 696-91, 2014, “Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between −30 °C and 30 °C, ASTM, West Conshohocken, PA.
Touloukian, Y. S., Kirby, R. T., Taylor, R. E., and Lee, T. Y. R., 1977, Thermal Expansion Nonmetallic Solids (Thermophysical Properties of Matter), Vol. 13, Purdue Research Foundation, IFI/Plenum, New York-Washington, pp. 1443–1452.
Brown, W., Derenne, M., and Bouzid, A., 2001, “Determination of the Mechanical and Thermal Properties of Selected Gasket Types,” Proceedings of the ASME/PVP Conference, Analysis of Bolted Joints, Atlanta, GA, Vol. 419, pp. 35–43.
ASTM, 2014, Draft Standard Test Methods for Hot Blowout Performance of PTFE Sheet or Sheet-Like Gaskets , ASTM Committee F03, ASTM International, West Conshohocken, PA.
Lee, W., Bouzid, A., and Huang, J., 2009, “Factors Affecting High Temperature Relaxation Behaviors of Expanded PTFE Gaskets,”ASME Paper No. PVP2009-77810. [CrossRef]
Bouzid, A., and Chaaban, A., 1997, “An Accurate Method for Evaluating Relaxation in Bolted Flanged Connections,” ASME J. Pressure Vessel Technol., 119(1), pp. 10–17. [CrossRef]
Nechanche, A., and Bouzid, A., 2010, “The Modelling of Bolted Flange Joints Used With Disk Springs and Tube Spacers to Reduce Relaxation,” Int. J. Pressure Vessel Piping, 87(12), pp. 730–736. [CrossRef]
Bouzid, A., Derenne, M., and Marchand, L., 2003, Long Duration Mechanical Performance of PTFE Based Gasket Materials, Welding Research Council Bulletin, New York, Vol. 484, pp. 12–22.

Figures

Grahic Jump Location
Fig. 1

HOBT test procedure

Grahic Jump Location
Fig. 4

Effect of thermal cycles on the lower bound stress of PTFE-base gasket style 1

Grahic Jump Location
Fig. 5

Effect of thermal cycles on the lower bound stress and displacement of PTFE-base gasket style 2

Grahic Jump Location
Fig. 6

Gasket stress versus gasket thickness during thermal cycling

Grahic Jump Location
Fig. 7

Effect of the number of thermal cycles on the gasket thickness and stress

Grahic Jump Location
Fig. 8

Effect of holding periods

Grahic Jump Location
Fig. 9

Effect of holding periods

Grahic Jump Location
Fig. 10

Effect of initial gasket stress

Grahic Jump Location
Fig. 11

Bolt load versus displacement: concept of flange rigidity

Grahic Jump Location
Fig. 12

Effect of initial gasket stress on creep displacement of four different PTFE-based gasket styles

Grahic Jump Location
Fig. 13

Effect of heating rate on creep displacement

Grahic Jump Location
Fig. 14

Effect of load on the coefficient of thermal expansion

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In