The stresses of a pipe flange connection with a spiral-wound gasket under internal pressure are analyzed taking account a nonlinearity and a hysteresis of the gasket by using an axisymmetric theory of elasticity and the finite element method (FEM). The leakage tests were also conducted using an actual pipe flange connection with a spiral-wound gasket. Using the contact stress distribution of the pipe flange connection with 3-in. nominal diameter under internal pressure and the tightness parameter, the values of the new gasket constants are obtained by taking into account the changes in the contact stress. A difference in the new gasket constants between the estimated values obtained from the actual pipe flange connection and the values obtained by the PVRC procedure is small. In addition, a method to determine the bolt preload for a given tightness parameter is demonstrated. The obtained results of the bolt preload for the pipe flange connection are in a fairly good agreement with those obtained by the PVRC procedure under a lower pressure application. However, a difference in the bolt preload is about 10% when an internal pressure is increased.

Issue Section:
Technical Papers
Keywords:
pipe flow, stress analysis, pressure vessels, pressure control, Pipe Flange, Contact Stress, Gasket Nonlinearity, Gasket Hysteresis, Stress Analysis, Axisymmetric Theory of Elasticity, FEM, Leakage Test, Load Factor, New Gasket Constants, Tightness Parameter
Topics:
Flange connections, Gaskets, Pipes, Pressure, Stress, Finite element methods, Leakage, Stress analysis (Engineering), Stress concentration, Elasticity, Flanges
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