Vibration problems in centrifugal pumps
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What are the main reasons for high vibration levels in centrifugal pumps? What is the standard for pump vibration levels? At 7 mm/s, is it necessary to run the backup pump? There are no significant changes in flow rate or current; will operating under such conditions cause frequent fluctuations in the pump outlet pressure?
If the flow rate and pressure fluctuate, the current will also fluctuate. There might be poor alignment; the shaft is bent, the clearance between the impeller and the ring is insufficient causing friction, or are there issues with the bearings? If there’s a problem with the bearing, there should be a loud noise.
First, conduct status monitoring and analyze the spectrum.
Vertical: 7.1 mm/s;; Horizontal: 4.5 mm/s