Design Considerations of Deflection in a Rigid Flange Gasket Joint

The deflection of a rigid flange as it affects and is in turn affected by varying amounts of gasket compression between the bolt holes is mathematically analyzed. Fiber-polymeric gaskets that can be further compressed beyond the compression at their sealing stress are shown to permit varying degrees of flange deflection while maintaining sealing criteria. The flange design factors of bolt span and deflection as they affect required flange thickness are discussed. Flange bending stress rather than the ability of the gasket material to seal is shown to impose an upper limit on the deflection.