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.
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June 2015
Research-Article
Characterization of PTFE-Based Gaskets at High Temperature
Abdel-Hakim Bouzid,
Abdel-Hakim Bouzid
Professor
Fellow ASME
e-mail: hakim.bouzid@etsmtl.ca
Fellow ASME
Ecole de Technologie Superieure
,1100 Notre-Dame Ouest
,Montreal, QC H3C 1K3
, Canada
e-mail: hakim.bouzid@etsmtl.ca
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Samir Benabdallah
e-mail: samirbenabdallah5@gmail.com
Samir Benabdallah
Ecole de Technologie Superieure
,1100 Notre-Dame Ouest
,Montreal, QC H3C 1K3
, Canada
e-mail: samirbenabdallah5@gmail.com
Search for other works by this author on:
Abdel-Hakim Bouzid
Professor
Fellow ASME
e-mail: hakim.bouzid@etsmtl.ca
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. Jun 2015, 137(3): 031012 (7 pages)
Published Online: June 1, 2015
Article history
Received:
June 27, 2014
Revision Received:
January 21, 2015
Online:
March 25, 2015
Citation
Bouzid, A., and Benabdallah, S. (June 1, 2015). "Characterization of PTFE-Based Gaskets at High Temperature." ASME. J. Pressure Vessel Technol. June 2015; 137(3): 031012. https://doi.org/10.1115/1.4029662
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