| Consult the following chart
to determine the seating stress required to properly seal the gasket
in question. To obtain the estimated requirement of flange clamping
pressure, simply multiply the chart value by the gasket contact
area in square inches. Add this value to any internal separating
pressure to which the joint will be subjected. Charted minimum seating
forces may exceed bolt stress limits. Proceed accordingly.
Gasket Compressibility
The flange pressure must be great enough to force the gasket into
surface imperfections of the flange and to stop fluid from passing
through the interface. The porous structure of the non-metallic
and semi-metallc gaskets must be compressed sufficiently to make
them impervious to fluids. The amount of compression required is
a function of the gasket material and the fluid pressure. It is
the percentage difference between the original gasket thickness
and the gasket thickness in service.
MINIMUM GASKET SEATING
STRESS (CHART)
(click image to enlarge)
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