Research Papers: Experimental Work

Characterization of PTFE-Based Gaskets at High Temperature

[+] Author and Article Information
Abdel-Hakim Bouzid

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.

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Fig. 1

HOBT test procedure

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Fig. 4

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

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Fig. 5

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

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Fig. 6

Gasket stress versus gasket thickness during thermal cycling

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Fig. 7

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

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Fig. 8

Effect of holding periods

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Fig. 9

Effect of holding periods

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Fig. 10

Effect of initial gasket stress

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Fig. 11

Bolt load versus displacement: concept of flange rigidity

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Fig. 12

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

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Fig. 13

Effect of heating rate on creep displacement

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Fig. 14

Effect of load on the coefficient of thermal expansion




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