Gasket either the large or small end of the

Gasket
contact stress is a key to analyze the capability of sealing of bolted flange
joint. The study of Abid et al., for
the significant of bolted flange behaviour is the linear thermal expansion of
the gasket. The sealing capability can be improved by expansion in axial
direction. However, in the radial direction the decreasing of contact stress
will tends to leakage. The gasket stress behaviour is evaluated which eight
locations 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 average
gasket contact stress is decreased in all locationsunder applied internal
pressure. Under applied internal pressure, the difference in stress magnitude
at the inner and outer seal rings is observed.

The
research from Rino et al.,the defination of the
leakage for single- and twin-gasket flange joint by using the minimum residual
stress required on gasket. Beyond the bending moment, the leakage is occurred,
where for a given internal pressure the residual stress line intersects the
gasket stress variation line. Another study from Fuenmayor and Rolf, both of configurations the flange
stresses is calculated. The comparison between the maximum longitudinal hub
stress and the longitudinal hub stress is obtained at either the large or small
end of the hub in finite element analysis.

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The gasket
stress based on study from Estrada, during the
gasket seating load step, the initial gasket
pre-stress is provided by the pre-load in the bolts. In this state, over the
entire surface full contact is insured, and deforms is filled the
irregularities on the flange face gasket. The further research from Billon et
al. The evaluation of the stresses created bythe
cumulative effects of the tightening of the stud bolts thepressure and the
temperature gradientsis performed to calculate thermal
and thermo-elastic for all the conditions loadings.

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