Problems with two pumps in series
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I want to choose a centrifugal pump with very low flow rate but extremely high head. I haven’t found such a pump yet, so now I’m thinking of using two centrifugal pumps in series. I would like to know if this is feasible and what precautions should be taken
Yes, but the rated flow rates of the two pumps need to be roughly the same
It’s possible, but it’s quite troublesome. In fact, you could consider using other types of pumps. If we talk about factors such as flow rate, head, and the type of medium, it might be possible to recommend a pump for you right away
The flow rates of the two pumps must be roughly equal; otherwise, the flow rate after they are connected in series will be that of the centrifugal pump with the lower flow rate. The strength of the centrifugal pump at the back can withstand the outlet pressure of two pumps. When two centrifugal pumps with different flow rates are connected in series, the one with the higher flow rate should be placed at the front ； When connecting two centrifugal pumps with different head values in series, the pump with the lower head should be placed first, so that the pump with the higher head can handle the total combined head.
A bypass should be added to the pump for regulating flow and pressure, and the material and pressure rating of the piping should be improved.
It’s very detailed; I agree with you.
Pay attention to the pressure rating of the second pump~~~ If the flow rates match, there should be no problem~~~
The requirements for connecting water pumps in series are explained in great detail on the 4th floor. However, there is a question: since a high head is required, why not choose a multi-stage pump first?
It is not recommended to use it this way; there are many problems. Moreover, it’s difficult to diagnose and repair problems when they occur. Why isn’t a positive-displacement pump chosen when the flow rate and pressure requirements are particularly high in Xiao Yang Cheng’s case?
How come I now have such high rights to assign ratings for HaiChuan coins? I’m even envious of it myself. I even want to give myself a score. Haha.
The poster is making use of an old pump. High-head pumps are either the right product or not available at a reasonable price. That’s how I understand it. Haha.