High vibration of air compressor
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It is an air compression unit used for air separation, driven by a turbine. After increasing the unit’s rotation speed from 4390 r/min to 4420 r/min, the vibration at the exhaust end of the air compressor gradually increased from around 20. After realigning the coupling, the vibration dropped to around 50 and remained stable. The main issues were high first-order frequency and reverse precession of the rotor. Has anyone else encountered this fault? How to handle it?
Changes in vibration with rotational speed are generally caused by rotor imbalance; in fact, it is necessary to check whether the bearings are installed properly, and whether the clearance and the preload on the bearing shells are within normal ranges.
The bearings have passed the inspection, and the vibration level does not change as the speed varies.
Check the pipeline stress. Which manufacturer’s compressor is it?
It is estimated that the rotor needs to be dynamically balanced at high speeds