The centrifugal pump has low flow rate! I hope the experts here can give some analysis
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This pump has been changed from a single-suction pump to a double-suction pump. Due to space constraints at the installation site, the inlet and outlet pipelines are arranged as they are shown in the diagram below. The current problem is that the flow rate is low; the rated flow rate is 118 tons, but currently it’s only 96 tons. The rated head is 95 meters, and the outlet pressure reads 11 kilograms. I think it’s possible that the resistance in the outlet pipelines is too high, resulting in a low flow rate, or perhaps the inlet setup is not optimal, which affects the pump’s performance. I hope everyone can help me analyze this issue
Is it because the pump’s performance does not meet the design specifications? What is the back pressure at the pump outlet (is it high)? Or is there a problem with the check valve that’s causing backflow from the other pump? Or is the flow channel inside the pump blocked by debris?
The prerequisites you described are not very clear; factors such as the length of the outlet pipe and the height of the outlet relative to the pump all need to be taken into account
Excessive resistance in the outlet pipeline results in a reduced flow rate.
Viscosity of restricted medium! Constraints such as pipeline resistance! Check if there are any issues with the piping?
This post was last edited by Red Alert on 2017-3-1 21:48. It appears from the diagram that the two pumps are operating in parallel; however, the total flow rate when both pumps work together is not equal to twice the flow rate of each pump when operating alone – it is lower, and this is related to the characteristics of the piping system.
The head is too high: the flow rate will definitely be low. The resistance at the pump outlet is high.
Due to the medium inlet pressure, it cannot be said that the outlet pressure is greater than the head
High export resistance is caused by either high resistance or one pump affecting another.