输油泵进出口管道振动诊断方法

Vibration diagnosis method of oil pump inlet and outlet pipes

输油泵机组及其进出口连接管道在运行过程中出现的振动问题是影响输油管道安全稳定运行的主要威胁之一。分析了管道系统激振力的来源和振动成因,并给出了诊断方法。针对某长输管道输油泵进出口管道出现的振动现象,运用振动测试手段对输油泵及其进出口管道分别进行了振动检测和分析。当输油泵进出口管道振动速度有效值最大达到9.28 mm/s、峰值速度达到13.12 mm/s,则需对其进行整改。综合工艺参数、振动频谱等因素,给出了管道振动的原因是输油泵产生的流体脉动激励,建议更换额定流量更小的叶轮,以减小流体脉动,消除管道系统的振动激励源。更换后的进出口管道振动速度有效值最大为3.19 mm/s、峰值速度为4.51 mm/s,减振效果明显,验证了管道振动为输油泵产生的流体脉动激励所致,保障了输油管道的安全运行。

The vibration of oil pump set and its inlet and outlet pipes during their operation is one of the main threats to the safe and stable operation of pipeline.Herein,the source of excitation force and the vibration causes of pipeline system were analyzed,and the diagnosis method was put forward.In view of the vibration phenomenon of the oil pump inlet and outlet pipelines of a long distance pipeline,vibration detection and analysis were conducted for the oil pump and its inlet and outlet pipelines respectively by means of vibration test.For the maximum effective value of the vibration speed of the oil pump inlet and outlet pipelines was up to 9.28 mm/s and the peak speed was up to 13.12 mm/s,pipeline correction was required.Considering the factors such as the process parameters and vibration spectrum,it was found that the cause of pipeline vibration was the fluid pulse excitation generated by the oil pump.It was recommended to replace the pump with an impeller with smaller rated flow,so as to reduce the fluid pulse and further to eliminate the vibration excitation source of the pipeline system.After pump replacement,the maximum effective value of the vibration speed of pipeline was 3.19 mm/s and the peak speed was 4.51 mm/s.The results indicate that the vibration is significantly reduced,verify that the pipeline vibration is caused by the fluid pulse excitation produced by the oil pump,and guarantee the safe operation of oil pipeline.