Q4/A volute centrifugal pump with an impeller diameter of 0.02 m has the following performance data when pumping water at the best efficiency point (bep). Impeller speed N = 58.3 rev/s capacity Q = 0.012 m3/s, total head Ah = 70 m, required NPSH = 18 m, and power = 12,000 W. Evaluate the performance data of a homologous pump with twice the impeller diameter operating at half the impeller speed, Then Calculate the specific speed for these two pumps.

Q4/A volute centrifugal pump with an impeller diameter of 0.02 m has the following performance data when pumping water at the best efficiency point (bep). Impeller speed N = 58.3 rev/s capacity Q = 0.012 m3/s, total head Ah = 70 m, required NPSH = 18 m, and power = 12,000 W. Evaluate the performance data of a homologous pump with twice the impeller diameter operating at half the impeller speed, Then Calculate the specific speed for these two pumps.

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Q4/A volute centrifugal pump with an impeller diameter of 0.02 m has the following performance data
when pumping water at the best efficiency point (bep). Impeller speed N = 58.3 rev/s capacity Q = 0.012
m3/s, total head Ah = 70 m, required NPSH = 18 m, and power = 12,000 W. Evaluate the performance
data of a homologous pump with twice the impeller diameter operating at half the impeller speed, Then
Calculate the specific speed for these two pumps.
*if you know the answer is Ns1=Ns2=816.4

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