| The pipeline flange connection system has been widely used in various industries.The system mainly includes flanges,gaskets,bolts and connected workpieces.The two parts of pipeline equipment are tightly connected together by the pretension of the bolts.However,due to the influence of external and internal factors,the system often leads to poor sealing and failure of the pipeline flange system,which will cause the problem of pipeline leakage,which not only wastes resources,pollutes the environment,causes large economic losses,but also causes catastrophe Consequences and personal injuries.Therefore,through the numerical analysis and research on the sealing performance of the pipeline flange,and the safety evaluation,it is of great significance to the practical application of the project.In this paper,for the leakage problem caused by the tightness of the pipeline flange connection system.the ANSYS finite element analysis software is used to establish a numerical model of the pipeline flange connection system,analyzes the system from the stress field and temperature field,studies the influence of the stress and temperature of each component of the system on the system's sealing,and concludes that it is difficult The data obtained is conducive to guiding the optimal design of the structural tightness.First,the steady-state temperature distribution of the flange connection system was studied,and the analysis showed that the temperature change rate of the pipes,gaskets,flanges,and fastening components in the system showed a decreasing relationship.Then,the thermal-structure coupling field model was established to study the stress field of each component of the system,and the pipeline flanges,gaskets and bolts were analyzed under three working conditions(pre-tightening,pre-tightening + internal pressure,pre-tightening +Stress distribution under internal pressure + temperature).In addition,the transient temperature field of the pipeline flange system is studied in this paper,and the temperature and stress field changes of the research object under two different working conditions are analyzed,such as the heating process when the system is started and the cooling process when the system is stopped.During the heating process of the pipeline,the stress changes of the system as a whole and those of the components are basically the same,and both increase with the increase of the heating time;during the cooling process of the pipeline,it gradually decreases with the increase of the cooling time,and finally achieves deformation coordination and the system tends to stabilize.Finally,using the ANSYS finite element analysis method to research the influence of the geometric dimensions of each component onthe sealing performance of the pipeline flange.Under the same pretension force,the stress generated by the bolt with a small flange ring thickness will be relatively large,and the effect of fastening the gasket is good;the tightening effect of the bolt hole center circle distance is better than the bolt hole center circle distance..In addition,within the range of the compression rate standard,the greater the preload force,the better the compression effect of the gasket,and the less likely the flange connection pipe is to leak.The article analyzes the influencing factors of pipeline flange sealing performance through finite element analysis and calculation methods,draws the general influencing law between them,forms a series of databases,and provides reliable and effective theory for improving the sealing performance of pipeline flange Support and optimize ideas. |
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