Vibration problems of two-stage centrifugal pumps
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This unit is equipped with one centrifugal pump; its rated flow rate is 89 m3/h, and the rated current is 197.7 A. The actual flow rate is 26 m3/h, with a current of 150 A. The horizontal vibration levels at the inlet and outlet sides of the pump are 4.7 mm/s and 5.1 mm/s respectively, both of which exceed the 4.5 mm/s threshold. By slightly opening the valves at the pump’s inlet and outlet, the vibration level dropped to 4.1 mm/s, but the current then rose to 180 A, so it’s not possible to open those valves any further. Are there any other methods to reduce the vibration levels of this pump? I would appreciate any advice from experts I am extremely grateful.
Rated at 89 open 26; that’s how the pump gets damaged
Problems existing: 1. By checking the performance curve, the current traffic level should not be within the allowed range； 2. There should be deposits on the impeller; the pump needs to be turned on to inspect the impeller.
The vibration is okay. To ensure production, it’s fine.
The fundamental solution is to find a way to install another pump that meets the production requirements. This is beneficial for saving energy and reducing consumption. It’s not worth it to damage the pump in this way. For reference.
What is the pump outlet pressure? What model?
HAY100-150X2 Pressure 2.1MPa
Has your issue been present since the device was turned on, or did it arise after some modifications? Does the allowable range of the pump’s performance curve include the current operating conditions?
It’s there from the moment the device is turned on; it remains that way, and the performance curve can no longer be found
Why does the pump vibrate more when operating below the minimum flow rate?
Low-flow operating conditions lead to reduced pump efficiency and increased power consumption; therefore, increasing the cross-line voltage will raise the current； At the same time, long-term deviations in flow rate can shorten the pump’s service life and increase vibration and noise levels