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Leakage analysis of gasketed flange joints under combined internap pressure and thermal loading

Abid, Muhammad and Khan, Kamran Ahmed and Chatta, Javed Ahmad and Nash, David (2011) Leakage analysis of gasketed flange joints under combined internap pressure and thermal loading. In: ASME Pressure Vessels and Piping Conference, 2011-07-17 - 2011-07-21.

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Leakage in Gasketed Flanged Joints (GFJs) have always been a great problem for the process industry. The sealing performance of a GFJ depends on its installation and applied loading conditions. This paper aims to finding the leak rate through ANSI class#150 flange joints using a compressed asbestos sheet (CAS) gasket under combined structural and thermal transient loading conditions using two different leak rate models and two different bolt-up levels. The first model is a Gasket Compressive Strain model in which strains are determined using finite element analysis. The other model is based on Porous Media Theory in which gasket is considered as porous media. Leakage rates are determined using both leak rate models and are compared against appropriate tightness classes and the effectiveness of each approach is presented.