Question

Why does pump head decrease with increasing flow rate in centrifugal pump

Answer 1

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The standard answer to the above when applied to a centrifugal pump system is that when the

valve is closed the flow decreases because pressure drop across the valve increases; this

increase in pressure drop causes the total head of the system to increase which as we know will

result in a different operating point on the pump curve. An increase in total head on the pump

curve will result in a decrease in flow (see Figure 1).

Answer 2

The standard answer to the above when applied to a centrifugal pump system is that when the valve is closed the flow decreases because pressure drop across the valve increases;this increase in pressure drop causes the total head of the system to increase which as we know will result in a different operating point on