Vibration Analysis Of The Pipeline System Of An Oil Pump Station

Pipeline transportation, as the main way of the oil transportation, undertakes about85%of China’s crude oil transportation. As the key mode of long-distance oil transportation, the operation of oil pump pipeline system is directly related to the stable and long-term operation of the entire oil transportation. The pipeline could vibration because the poor dynamic equilibrium, improper foundation design, the presence of pulsating flow or resonance, and this is a major security risk to enterprise production. So improving the operating efficiency of the pump pipeline can bring great economic benefits.The vibration of the pump pipeline system is a complex fluid-structure dynamic coupling phenomenon. At present, there is little references of this problem and little experience to solve it. By solving the fluid-structure dynamic coupling of pump pipeline, this thesis proposes an step-by-step computational method to solve this complex fluid-structure dynamic coupling problem.This thesis aims at the performance evaluation of vibration in the pipeline in reconstruction of the pipeline system when the oil pumping station the original flow of2600m3/h increased to4000m3/h. Based on the mechanism of transmission and the movement of crude oil within the pump pipeline and pipeline structural vibration, the solid model of the flow of crude oil within the pump pipeline and the finite element model with the match pipeline structure can be established, then the vibration characteristics of the pipeline structure and the wall pressure values in the oil pressing process were calculated. Structure function of pressure achieves the pipeline vibration problem fluid-structure dynamic coupling, this function contains the excitation frequency, pressure and pressure fluctuation amplitude of the crude oil within pipeline. Analysis the experimental test results of oil pumping station pipeline vibration response when the flow is2600m3/h, obtained pressure fluctuation frequency by the dominant frequency and the low-level inherent pipeline structure frequency combination. Compared with actual test results and the calculation of the pressure function check the fluctuation amplitude values of wall pressure. Through the analysised excitation frequency, the calculated wall pressure and checked fluctuation amplitude values and adopted the step-by-step calculation method analysis and calculate the oil pumping station pipeline when the flow is4000m3/h, got the oil pumping station pipeline under the existing constraints the stress and speed failed to meet the safety standards. To control the stress and vibration speed of the pipeline system, this thesis proposes two feasible constraint modification schemes. The modified speed and strength can meet the requirements. Due to pressure fluctuations structures according to the natural frequency and the calculation results contain the dynamic response of resonance conditions, so the vibration performance assessment is more reliable.This thesis proposes a step-by-step computational method of fluid-structure dynamic coupling of oil pumping station pipeline system, it has the reference value for the calculation of the similar projects.