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Sample Gasket Application Problem
 For
assistance with a particular gasket problem contact
Lamons sales Department, or a technical
representative.
Example
Conditions: A designer wants a gasket recommendation
for a special application sealing at 600 psi and
500°F.
Conditions:
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Design pressure - 600 psi
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Test Pressure - 900 psi
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Design temperature -
500°F
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Process material - steam
Flange details
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Bolting - 24 - 1-1/8 thds.
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Bolt Material - ASTM A
193 - B7
Flange Material - ASTM A312 Type 316S.S.
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Allowable
bolt stress @ Ambient Temperature, according to
Stress Table 1, Page 45 is only 20,000 PSI; however,
to prevent leakage under hydrotest it is decided to
tighten bolting to 30,000 PSI. Allowable Stress @
500°F - 20,000 PSI Analysis The pressure-temperature
conditions indicate a metallic gasket should be
used. The conditions appear to be suitable for a
spiral wound gasket. The flange material 316S.S., is
compatible with the steam environment @500°F.
Therefore, the logical choice for the metal in the
gasket is 316 S.S Since Grafoil® is also compatible
with the environment, it is selected as the filler
material.
Analysis
The
pressure-temperature conditions indicate a metallic
gasket should be used. The conditions appear to be
suitable for a spiral wound gasket. The flange
material 316S.S., is compatible with the steam
environment @500°F. Therefore, the logical choice
for the metal in the gasket is 316 S.S Since Grafoil®
is also compatible with the environment, it is
selected as the filler material.
>>The End
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