Vibration diagnosis method of oil pump inlet and outlet pipes

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.