Research On Reliability Of Bolted Flanged Connection System Based On Spiral Wound Gasket

Flange joint is widely used in petroleum chemical industry equipment,power plant and other pipeline connection.Is one of the important sealing gasket components,its performance is one of the factors that directly influence the connection seal reliability.In order to prevent the damage from the gasket seal failure,the system composed of the bolts,flange and gasket as the research object,it is of great significance.Due to adapt to the working condition of a wide range,good sealing performance and the advantages of easy to install,spiral wound gasket has been widely used in sealing system in all kinds of gaskets.According to statistics,nearly sixty percent bolted flange connection system application of gasket is spiral wound gasket.Based on the Orthogonal Test Method,we made sealing performance and compression rebound test for stainless steel-flexible graphite spiral wound gasket,determines the optimum parameters of guarantee the performance of gasket in this paper;research on the relationship between temperature,pre-tightening load and flange corner with the calculation formula of flange corner which is derived;propose a method of prediction and control of leakage rate under high temperature;treat each flange joint element as a whole and see the interaction between components,establish the 1/8 parametric 3-D finite element model for a flanged joint system by using INTER194 gasket units to simulate non-linearity and non-conservative of gaskets materials,the stress distribution and deformation conditions have been obtained for joints and every component;the influences of the important parameters-geometry dimension,such as the bolt pre-loading intensity,the internal pressure and the thickness of the gasket.