Abstract: Circulating hydrogen compressor is the key equipment of hydrofining unit. Its normal operation plays a decisive role in the long cycle operation of the device. In the recent operation cycle, a measuring point at the driving end of the compressor prime mover turbine vibrated intermittently for 66 times, which affected the safe and stable operation of the unit to a certain extent. During operation, the status monitoring system was used to analyze the problem and some measures were taken to deal with it, yet the problem was not solved from the source. During the process of device shutdown and overhaul, the turbine was disassembled and the vibration inducement was found out. It has been running normally after treatment. This paper introduces this phenomenon and its causes, which provides reference for troubleshooting of other similar equipment.

Key words: turbine, vibration, intermittent, condition monitoring