Performance Of Pipe Flange Connections Research Articles

Evaluation of Sealing Performance of Pipe Flange Connections for Low Temperature Fluids by Numerical Analysis

Evaluation of Sealing Performance of Pipe Flange Connections for Low Temperature Fluids by Numerical Analysis

Evaluation of Thermal Stress and Sealing Performance of Pipe Flange Connections for Low Temperature Fluids

Evaluation of Thermal Stress and Sealing Performance of Pipe Flange Connections for Low Temperature Fluids

Effects of the Nominal Diameter and Scattered Bolt Preloads on Sealing Performance of Pipe Flange Connection with Non-asbestos gaskets under Internal Pressure

Effects of the Nominal Diameter and Scattered Bolt Preloads on Sealing Performance of Pipe Flange Connection with Non-asbestos gaskets under Internal Pressure

The Effects of Nominal Diameter on Mechanical Characteristics and Sealing Performance of Pipe Flange Connection under Internal Pressure

The Effects of Nominal Diameter on Mechanical Characteristics and Sealing Performance of Pipe Flange Connection under Internal Pressure

Effect of External Bending Moment on the Sealing Performance of Pipe Flange Connection

Since an external bending moment affected the sealing performance of pipe flange connection, it was important to investigate this effect. This paper analyzed the contact gasket stress distribution of pipe flange connections and evaluated the effect of external bending moment on the sealing performance from the viewpoint of changes in contact gasket stress. The study included the FE analyses and the experimental leakage tests. The FE analyses revealed the large decrease of contact gasket stress at tension side and small increase at compression side. The difference in change in contact gasket stress was caused by the non-linear hysterics characteristics of stress-displacement curve of gasket. The FE analyses also revealed that the loading order, internal pressure and external bending moment, also affected the sealing performance due to the non-linear deformation characteristic of the gasket. The experimental leakage tests using helium (He) gas were analyzed by the finite element method and discussed. This paper also evaluated the stress distribution in the pipe flange under external bending moment. The results suggested that the hub stress dominated the flange structure and the most important factor in designing the flange.

810 管フランジ締結体の密封性能に及ぼす曲げモーメントの影響評価(OS8-3 フランジガスケット締結体の力学と密封性能評価)

810 管フランジ締結体の密封性能に及ぼす曲げモーメントの影響評価(OS8-3 フランジガスケット締結体の力学と密封性能評価)

657 曲げモーメントを受ける管フランジ締結体の密封性能評価(フランジガスケット締結体の力学と密封性能評価IV)

657 曲げモーメントを受ける管フランジ締結体の密封性能評価(フランジガスケット締結体の力学と密封性能評価IV)

OS0510 ガスケットの高温特性とフランジ締結体の密封性能評価(OS05-03 フランジ締結体の密封性能評価,OS05 フランジガスケット締結体の力学と密封性能評価)

OS0510 ガスケットの高温特性とフランジ締結体の密封性能評価(OS05-03 フランジ締結体の密封性能評価,OS05 フランジガスケット締結体の力学と密封性能評価)

Sealing Performance of Pipe Flange Connections

In these environmentally sensitive times, it is very important to reduce the amount of gasses released into the environment from pipe flange connections. The design procedure in which the tightness of the joint is used as a design parameter, therefore, must be established for the pipe flange connection. In this study, sealing performance of the pipe flange connection is examined by conducting both the finite element simulation taking account of nonlinear stress-strain relationship of the gasket and the leakage test using nitrogen gas. The analytical objects are the pipe flange connections with the compressed asbestos sheet gasket, in which the gasket width and flange thickness are varied for the purpose of changing the amount of flange rotation. It is concluded that the leak rate of the pipe flange connection largely depends on the maximum gasket contact stress remained when the internal fluid is pressurized. The validity of the axisymmetric finite element model of the pipe flange connection is also demonstrated by comparing numerical and experimental results of the flange rotation angle.

Effects of The Clamping Force Scatter on The Bolting-Up Performance of Pipe Flange Connections

Effects of The Clamping Force Scatter on The Bolting-Up Performance of Pipe Flange Connections

An Analysis of Pipe Flange Connections Using Epoxy Adhesives/Anaerobic Sealant Instead of Gaskets

Abstract This paper deals with the strength and the sealing performance of pipe flange connections combining the bonding force of adhesives with the clamping force of bolts. The epoxy adhesives or anaerobic sealants are bonded at the interface partially instead of gaskets in pipe flange connections. The stress distribution in the epoxy adhesives (anaerobic sealant), which governs the sealing performance, and the variations in axial bolt force are analyzed, using an axisymmetrical theory of elasticity, when an internal pressure is applied to a connection in which two pipe flanges are clamped together by bolts and nuts with an initial clamping force after being joined by epoxy adhesives or anaerobic sealant. In addition, a method for estimating the strength of the combination connection is demonstrated. Experiments are performed and the analytical results are consistent with the experimental results concerning the variation in axial bolt force and the strength of combination connections. It can be seen that the strength of connections increases with a decrease in the bolt pitch circle diameter. Furthermore, it is seen that the sealing performance of such combination connections in which the interface is bonded partially is improved over that of pipe flange connections with metallic gaskets.