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TECHNICAL PAPERS

Stress Analysis and Determination of Bolt Preload in Pipe Flange Connections With Gaskets Under Internal Pressure

[+] Author and Article Information
Toshiyuki Sawa, Naofumi Ogata

Department of Mechanical Engineering, Yamanashi University, Yamanashi, Japan

Takahito Nishida

Nippon Valqua Inc., Tokyo, Japan

J. Pressure Vessel Technol 124(4), 385-396 (Nov 08, 2002) (12 pages) doi:10.1115/1.1511736 History: Received September 26, 2001; Revised July 30, 2002; Online November 08, 2002
Copyright © 2002 by ASME
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References

Figures

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A pipe flange connection with a spiral-wound gasket subjected to internal pressure
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A model for theoretical analysis and dimensions of a pipe flange connection—(a) the case where bolt clamping force Ff+Ft is applied; (b) the case where internal pressure is applied
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Approximated stress-strain lines of the spiral-wound gasket used in the theoretical analysis
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Mesh divisions and stress-strain relationship of the gasket in the FEM calculations—(a) an example of mesh divisions in the FEM calculations; (b) stress-strain lines of the spiral-wound gasket used in the finite element calculations
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Dimensions of the pipe flange, the spiral-wound gasket and the bolt used in the experiments—(a) pipe flange, (b) spiral-wound gasket, (c) bolt
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Schematic of the experimental setup of the pipe flange connection in the experiments
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Approximated stress-strain lines of the spiral-wound gasket used in the theoretical analysis (the case where internal pressure is applied)
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Effects of Young’s modulus E3 on the contact stress distributions (the case where internal pressure is applied)
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Contact stress distributions of the pipe flange connection obtained by FEM (in the θ direction)—(a) the case of initial clamping state; (b) the case where internal pressure is applied
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Contact stress distributions of the pipe flange connection obtained by FEM (in the r direction, θ=0 deg)—(a) the case of initial clamping state; (b) the case where internal pressure is applied
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Comparisons between the analytical and the FEM results (in the r direction, θ=0 deg)—(a) the case of initial clamping state; (b) the case where internal pressure is applied
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Measured results of the tightness parameter and the new gasket constants for the spiral-wound gasket in the pipe flange connection—(a) helium gas, (b) nitrogen gas
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Comparisons of increment in axial bolt force (load factor ϕg) of the pipe flange connection

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