We have a pump with an ~25' shaft running at variable speed up to 229 RPM and power up to about 450 Hp. It had some initial high vibration but after two years of operation it is now vibrating to the point of tripping. Extensive vibration and modal analysis has been done and the conclusion is a bent shaft. Is it possible that the cause is imbalance on the impeller? I'm trying to get a handle on how a bent shaft would get progressively worse. Any insight would be appreciated.
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