Research Papers: Fluid-Structure Interaction

Prediction of Leak Rates Through Porous Gaskets at High Temperature

[+] Author and Article Information
Lotfi Grine

Ph.D. Student
ve-mail: grinelot@yahoo.fr

Abdel-Hakim Bouzid

Fellow ASME
e-mail: hakim.bouzid@etsmtl.ca
Mechanical Engineering Department,
Ecole de Technologie Superieure,
1100, rue Notre-Dame Ouest,
Montreal, PQ, H3C 1K3, Canada

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received April 12, 2012; final manuscript received December 20, 2012; published online March 18, 2013. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 135(2), 021302 (Mar 18, 2013) (6 pages) Paper No: PVT-12-1042; doi: 10.1115/1.4023425 History: Received April 12, 2012; Revised December 20, 2012

The ability of a gasket to maintain tightness under different operating conditions has been studied extensively in recent years. However, most of the research studies conducted on leakage predictions was performed at room temperature. The aim of this work is to predict leakage through gaskets taking into account the effect of the temperature on the fluid properties and gasket internal structural characteristics. The analytical model of slip flow regime to evaluate the mass leak rates through a porous gasket developed by Grine and Bouzid (2011, “Correlation of Gaseous Mass Leak Rates Through Micro and Nano-Porous Gaskets,” ASME J. Pressure Vessel Technol.) was used in this study. The results from the model were validated and compared with the experimental data obtained from tests conducted on the Universal Gasket Rig with two different gases (helium and nitrogen). The leak rates measured are in the range of 1 to 0.0001 mg/s, which are measurable using the pressure rise technique. As a second objective, the influence of the gasket displacements caused by stress and temperature on the flow leakage was studied. A relationship between displacement or void thickness and leakage is clearly demonstrated. The slip flow regime model is capable of predicting leakage at temperature with reasonable accuracy.

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Fig. 1

Universal Gasket Rig

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Fig. 2

Simple test fixture

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Fig. 3

Dynamic viscosity versus temperature

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Fig. 4

Helium mass leak rate measurements gasket stress (a) 6.9 MPa and (b) 27.6 MPa

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Fig. 5

Parameter A versus the reciprocal pressure ratio for Sg = 27.6 MPa; (a) T = 23  °C and (b) T = 121.1  °C

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Fig. 6

Nitrogen leak measurements and predictions (a) 6.9 MPa, (b) 27.6 MPa

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Fig. 7

Mass leak rates versus gasket displacement at different temperatures and inlet pressure using nitrogen

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Fig. 8

Gasket stress versus gasket displacement

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Fig. 9

Mass leak rates versus void thickness gasket stress (a) 6.9 MPa and (b) 27.6 MPa

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Fig. 10

Effect of temperature on grid leakage (a) leak path diameter and (b) number of leak paths



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