Centrifugal pump
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Why does the outlet pipeline shake violently when a centrifugal pump is under vacuum?
That’s because the pump is shaking violently too! The pump shakes violently because, when it is under vacuum, the impeller lacks proper dynamic balance; as a result, the impeller causes the pump to shake as well!
Vacuum condition does not mean that there is no fluid inside the pump at all; there is a small amount of fluid in the impeller’s flow channels, but its distribution is uneven. This leads to changes in the dynamic balance of the impeller, resulting in increased vibration of the impeller. This in turn causes the shaft, the volute, and the mechanical seal to vibrate as well, and the pipelines also vibrate. Therefore, vacuum conditions pose a serious threat to centrifugal pumps, as they can easily lead to damage to the mechanical seal and bending of the shaft!
The medium inside the pump is not full and contains air, resulting in a significant drop in the outlet pressure of the centrifugal pump along with severe fluctuations. It causes fluctuations in the pipeline, I guess.
There are too many liquid impurities or cavitation; adjust the inlet and outlet openings or the exhaust