What are the causes of vibration in fluorine-lined centrifugal pumps?
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When centrifugal pumps are used in the field, they often start to vibrate after some time. What are the reasons for vibration when such pumps are used on site? I summarized it. First is the issue of coaxiality between the pump connector and the electrical connector. Due to eccentricity, the pump vibrates when the motor drives it. Pump shaft assembly issue: eccentricity during assembly
What other factors can affect pump vibration?
Problems with the alignment of the couplings, damaged or unbalanced couplings, clogged or damaged impellers, the equipment operating outside the permitted range, stress in the pipes, an unstable foundation, unbalanced rotating components, bent shafts, damaged rolling bearings, clogged inlet pipes, cavitation, soft feet
The main reason is that the impeller is damaged and not properly aligned. The process is unstable
Clogged inlet pipe, eccentric coupling, bent shaft, damaged rolling bearings.
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Besides the coupling alignment issue you mentioned, there are three other problems; one is caused by loose pipes or loose screws. The second is the release of pipeline welding stress under vibration. The third and most important issue is an unreasonable design; insufficient inlet flow leads to cavitation, which ultimately damages the bearings.