Abstract
The stresses of a blind flange connection with a spiral wound gasket under internal pressure are analyzed taking account a hysteresis of the gasket using axisymmetric theory of elasticity as a four-body contact problem. The leakage tests were also conducted using an actual blind flange connection with a spiral wound gasket. Using the contact gasket stress distribution of the blind flange connections with 3" nominal diameter under internal pressure, the values of the new gasket constants proposed by PVRC were estimated by taking account the changes in the contact gasket stress. A difference in the new gasket constants was small between the PVRC values and the estimated values that were obtained by using the actual contact gasket stress. In addition, a method for determining the bolt preload for a given tightness parameter was demonstrated. The discrepancy of the bolt preload was increased between the estimated values and those by the PVRC as the given tightness parameter was increased.
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