Max Compression & Reinstall of Spiral Wound Gaskets -Advice Needed

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SUMMARY

The maximum allowed compression for spiral wound gaskets is determined by the manufacturer and is application-specific. Once installed, these gaskets undergo permanent deformation and cannot be reused effectively; the hidden costs of reinstallation often exceed the cost of new gaskets. The general consensus among users is to replace spiral wound gaskets after a single use, particularly in high-stress environments like boiler manholes. Proper torque specifications are critical, but many users reported a lack of torque wrenches, leading to potentially excessive tightening.

PREREQUISITES
  • Understanding of spiral wound gasket applications
  • Familiarity with manufacturer specifications for gaskets
  • Knowledge of torque specifications and their importance
  • Experience with high-stress sealing environments, such as boilers
NEXT STEPS
  • Research manufacturer guidelines for spiral wound gasket compression limits
  • Learn about the effects of permanent deformation in gaskets
  • Investigate the cost-benefit analysis of gasket reuse versus replacement
  • Explore best practices for torque application in gasket installation
USEFUL FOR

Engineers, maintenance personnel, and procurement specialists involved in industrial sealing applications, particularly in high-pressure environments such as power plants and boiler systems.

Osvaldo
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TL;DR
Thickness and maximum compression
Would need advise on which is the maximum allowed compression to apply to a gasket according to the thickness of the gasket. If this information is available from the manufacturers, would like to know. Also, if once used, the gasket can be reinstalled and which is the experience about that.
 
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Flexitallic has some decent reference information.

This is really application specific.
 
The manufacturer specifies compression or bolt torque. You must identify the manufacturer.
A spiral wound gasket is deformed permanently when installed, it does not recover.

Osvaldo said:
Also, if once used, the gasket can be reinstalled and which is the experience about that.
The hidden costs of re-using a gasket works out greater than the cost of replacing it with a new gasket.
 
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We used spiralwounds on the boiler manholes. General consensus was that if you used it once you chuck em. They get crushed quite badly when you tighten them down.
Can't comment on recommended torques though. We tightened them as hard as we could and then flogged them down some more sometimes, the bolts were big though and could handle flogging. No torque wrenches available...management did not believe in torque wrenches and thought the guys would destroy them.
 
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