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Why can pumps with low specific speed not achieve a flow rate of 105%~110% of the optimal efficiency flow rate point?

2020-04-01View Original

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API610 states that pumps with low specific speed cannot achieve a flow rate of 105%–110% of their optimal efficiency flow rate. Why is that? Do any of you know the reason?
Reply #22020-04-11
Isn’t flow rate proportional to rotational speed?

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