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Here is my measured pump curves for a 13-B pump being driven by a 1.5 horsepower saw motor. I varied pulley size to vary rpm. When a large pulley to drive it at 7000 rpm was tried, the circuit breaker blew (zero flow).
The second page is the energy required to pump water according to the pump curve for 5594 rpm. As you can see, at zero flow, the required *pumping* energy is very low, rises as flow rises, and drops at high flows since there is less head developed. All this assumes my equations for HP are correct.
Bill Schertz
KIS Cruiser # 4045
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