The centrifugal pump has low outlet pressure and sufficient flow rate, but it fails to deliver water at a height of 30 meters – why is that?
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The pump’s specifications are a head of 48 meters and a flow rate of 25 m3/h. The problem is that the pressure at the pump’s outlet is 0.22 MPa; after passing through a series of elbows and valves, the flow reaches the equipment located 30 meters away at a rate of 23 m3/h. It’s not clear why the flow rate is so low when water flows from the main pipe to the 7 branch pipes
The head is 48 meters, yet the outlet pressure is only 0.22 MPa. If you are sure that there are no issues with the pump’s inlet pipeline (in terms of diameter and blockages) as well as with the liquid level in the inlet tank, then the supplier needs to send a technician to resolve the problem.
It should be a problem with the pump or its installation; first, check whether the installation meets the pump’s design requirements.
Adjusting the pump inlet valve to increase the pump outlet pressure should resolve this issue.
There is a problem with the pump outlet pressure; at a head of 48 meters, the pump outlet pressure is only half of what it should be under normal conditions.
Is there a problem with the installation or the pump design?
Consider the diameter and length of the outlet pipe, the number of elbows, the number of valves, any other sources of resistance, as well as the viscosity of the fluid being transported. Calculate the pressure loss; if it falls within the acceptable range, then the problem lies with the pump, and further inspection of the pump is necessary.
At this outlet pressure, it is indeed only around 20 meters. If the pump itself is fine, it’s likely that there is gas in the pipes, preventing the liquid from filling them completely.
There is a problem with the pump outlet pressure, and the pump selection was also inappropriate. The flow rate will decrease when a lift of 48 meters is used to reach a height of 30 meters
For such problems, it’s better to turn to the manufacturer for a solution.