Numerical Simulation Analysis Of Large Diameter Pressure Pipeline Fracture

Large diameter pressure pipe fracture failure can cause serious consequences. Aiming at the problem of fracture failure of a buried large-diameter pipeline, using theoretical analysis, numerical simulation and comparative analysis methods to find out the pressure pipeline breakage reasons. According to the numerical simulation results, it is suggested that the prevention of pipeline fracture is proposed, which provides a theoretical basis for the pumping station to solve the pipeline fracture problem. The main results and conclusions of this paper are as follows:(1) Through establishing the finite element analysis model of DN2400 pipeline pressure, combined with actual boundary conditions and operating conditions, using finite element analysis software ANS YS Workbenchl6.0 to do static analysis for the buried pipeline of the pump station. It was found that the maximum equivalent stress under load in combination is much greater than the yield strength of steel Q23S, Resulting in a pressure pipeline breakage occurred at the weakness of the fracture.(2) The static analysis of buried pipeline under the condition of pressure and temperature is not applied, and the equivalent stress maximum value is only 30.602MPa,but the maximum 374.48MPa of the equivalent stress under full bad is quite different, it can be seen that the pressure and temperature load of pipeline have great influence on the equivalent stress of pipeline, and other loads have little influence on it.(3)The working pressure of pipeline changes in the change amount of 0.2 MPa in l.OMPa to 2.0MPa to do static analysis, the equivalent stress of pipeline is changed from 318.49MPa to 437.25MPa, and it is basically linear and rapid growth. It shows that the pressure change of pipeline has a great influence on the equivalent stress of pipeline.(4) The working pressure of pipeline changes in the change amount of 0.2 MPa in l.OMPa to 2.0MPa, the relationship between temperature load and the equivalent stress is compared with the same pipeline pressure, in the case of temperature load, the equivalent stress is much larger than the temperature of no load, the maximum difference is 146.90MPa, the minimum difference is 88.29MPa. It shows that temperature load has a great influence on the equivalent stress of pipeline too. (5) According to the results of numerical simulation, combined with the actual situation of the pumping station, puts forward 3 suggestions for pipeline fracture problems.The results of this study provide a theoretical basis to solve the fracture problem of buried pipeline of the pumping station, and it has a certain reference value for similar pressure pipeline design.