In this work, we address the issue of the sealing performance of ring-shape valve compression packings. Our analysis is focused on the characterization of the permeability of the rings made of die-formed exfoliated graphite. Because of the tight character of the material, significant Klinkenberg effects are expected. In addition, due to the manufacturing process, permeabilities and as well as Klinkenberg coefficients and in the respective axial and radial directions are markedly different and strongly dependent upon the applied stress. A specific experimental device based on pressure pulse decay of nitrogen through the material was designed for the measurement in each direction under a controlled axial compression. Determination of and and and is performed on the basis of a nonstationary gas flow model in the radial and axial directions using an inverse procedure applied to the pressure decay signal. Our results confirm the efficiency of the method developed here. They clearly show the anisotropic character of the material ( is roughly one order of magnitude larger than ) and the dependence upon axial compression. The present analysis is the key step before further quantification of the leak rate that may result from the permeation through the material as envisaged here as well as through interfaces between the housing, the packings, and the stem.
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e-mail: didier.lasseux@ensam.eu
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August 2011
Research Papers
Permeability Measurement of Graphite Compression Packings
Didier Lasseux,
Didier Lasseux
TREFLE, CNRS UMR8508,
e-mail: didier.lasseux@ensam.eu
University of Bordeaux
, Esplanade des Arts et Métiers, 33405 Talence Cedex, France
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Pascal Jolly,
Pascal Jolly
TREFLE, CNRS UMR8508,
University of Bordeaux
, Esplanade des Arts et Métiers, 33405 Talence Cedex, France
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Yves Jannot,
Yves Jannot
LEMTA,
CNRS UMR7563 2
, Avenue de la Forêt de Haye-BP 160, 54504 Vandoeuvre Cedex, France
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Emmanuel Sauger Benoit Omnes
Emmanuel Sauger Benoit Omnes
CETIM-74
, Route de la Jonelière-BP 82617, 44326 Nantes Cedex 3, France
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Didier Lasseux
TREFLE, CNRS UMR8508,
University of Bordeaux
, Esplanade des Arts et Métiers, 33405 Talence Cedex, Francee-mail: didier.lasseux@ensam.eu
Pascal Jolly
TREFLE, CNRS UMR8508,
University of Bordeaux
, Esplanade des Arts et Métiers, 33405 Talence Cedex, France
Yves Jannot
LEMTA,
CNRS UMR7563 2
, Avenue de la Forêt de Haye-BP 160, 54504 Vandoeuvre Cedex, France
Emmanuel Sauger Benoit Omnes
CETIM-74
, Route de la Jonelière-BP 82617, 44326 Nantes Cedex 3, FranceJ. Pressure Vessel Technol. Aug 2011, 133(4): 041401 (8 pages)
Published Online: May 16, 2011
Article history
Received:
September 10, 2009
Revised:
October 18, 2010
Online:
May 16, 2011
Published:
May 16, 2011
Citation
Lasseux, D., Jolly, P., Jannot, Y., and Omnes, E. S. B. (May 16, 2011). "Permeability Measurement of Graphite Compression Packings." ASME. J. Pressure Vessel Technol. August 2011; 133(4): 041401. https://doi.org/10.1115/1.4002922
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