Gasketcontact stress is a key to analyze the capability of sealing of bolted flangejoint. The study of Abid et al., forthe significant of bolted flange behaviour is the linear thermal expansion ofthe gasket. The sealing capability can be improved by expansion in axialdirection. However, in the radial direction the decreasing of contact stresswill tends to leakage.
The gasket stress behaviour is evaluated which eightlocations in front of each bolt is selected for finite element analysis. 3.2%of the average gasket contact stress decreases with the pressure is applied,but it is still above the required seating stress value. 4.5% of the averagegasket contact stress is decreased in all locationsunder applied internalpressure. Under applied internal pressure, the difference in stress magnitudeat the inner and outer seal rings is observed. Theresearch from Rino et al.,the defination of theleakage for single- and twin-gasket flange joint by using the minimum residualstress required on gasket.
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Beyond the bending moment, the leakage is occurred,where for a given internal pressure the residual stress line intersects thegasket stress variation line. Another study from Fuenmayor and Rolf, both of configurations the flangestresses is calculated. The comparison between the maximum longitudinal hubstress and the longitudinal hub stress is obtained at either the large or smallend of the hub in finite element analysis.The gasketstress based on study from Estrada, during thegasket seating load step, the initial gasketpre-stress is provided by the pre-load in the bolts. In this state, over theentire surface full contact is insured, and deforms is filled theirregularities on the flange face gasket.
The further research from Billon etal. The evaluation of the stresses created bythecumulative effects of the tightening of the stud bolts thepressure and thetemperature gradientsis performed to calculate thermaland thermo-elastic for all the conditions loadings.