High compressor vibration
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The compressor stopped operating due to high vibration; after maintenance, it was started up again, and a similar situation occurred! The VSA63023 has high vibration levels; 8600 is the lowest rated speed for this compressor, with an inlet nitrogen pressure of 0.44 and an outlet pressure of 1.22. Under design conditions, the inlet pressure is 1.6 and the outlet pressure is 4.8. I would appreciate advice from those with more experience. The bearing shells were checked and found to be fine; the probes were inspected and replaced, and the voltage is within normal limits!
Looking at the shaft vibration shown in the image, the differences between the two measurement points for the same bearing are quite large, and the shaft vibration at the drive end is high. Since there is no vibration monitoring spectrum analysis, it is recommended to check the coupling to see if its dimensions are satisfactory ； Secondly, it is recommended to check the hot-state alignment.
On the 2nd floor, the key aspect is the concentricity of the couplings in their hot state
Looking at the picture, is that shaft of yours broken?
Check the alignment, bearing clearances, coupling, etc., again – the vibration remains the same even after starting!
No obvious mechanical causes for the vibration can be identified from the images; it is recommended to check whether the voltage changes in the preamplifier of the sensor probe, where the vibration is severe, correspond with the actual vibration trends
During several startup attempts of the unit, high vibration was observed in channel X at the compressor coupling, and this vibration changed in sync with the change in rotational speed. The spectrum mainly consists of power frequency components, and the main cause of the high vibration is the imbalance of the rotor shafting. It is recommended that, if time permits, the rotor be sent back to the factory for high-speed dynamic balancing or replaced with a spare rotor; if starting up the unit promptly is necessary, on-site dynamic balancing of the unit can be carried out.
Is there ash and debris on the surface of the impeller? If there are no issues with the gauge and bearing clearance, and there is no static friction, then the only option left is to perform dynamic balancing
It is recommended to realign and perform dynamic balancing on the rotor
Dynamic balancing – what are you waiting for?:lol