After the multi-stage centrifugal pump starts operating, the pump pressure remains constant while the flow rate continues to decrease until it stabilizes at 50%
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After the multi-stage centrifugal pump starts operating, the pump pressure remains constant while the flow rate continues to decrease until it stabilizes at 50%. I am seeking advice from experts
Could it be that the guide vanes and the mouth rings at the pump’s inlet and outlet sections are severely worn, resulting in excessive volume loss in the pump and thus affecting its flow rate?
Internal leakage may be caused by the detachment of the impeller or the pump’s mouth ring
I don’t understand what you mean by ‘stable’ Is there a filter at the pump’s suction inlet, and are there pressure gauges before and after the filter? Are there any symptoms when the traffic doesn’t drop? For example, if there are cracking noises inside the pump, etc., you can check the pump’s performance curve to see what the head pressure is at near-shut-off points. Close the valve and see if the pressure corresponds to that value; if it does, then it’s likely not related to the pump itself, and the pipelines should be checked instead. Such as filters, valves, and so on
Check the pump outlet valve and see if it is related to the user’s consumption. The pressure when the pump is started is slightly higher than the pressure during normal operation.
:D: Additional note for floor 4 – is it possible that the rotor is rotating in the reverse direction?