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A manufacturer desires to double both the discharge and head on a geometrically similar pump. Determine the change in rotational speed and diameter under the new conditions. Changing the speed (N,rpm) of pump or fan Capacity (Q) Head (H) Q2Q1=N2N1H2H1=(N2N1)2 Power (P) P2P1=(N2N1)3 Changing the impeller diameter (D) for a given speed Capacity (Q) Head (H) Power (P) Q2Q1=D2D1H2H1=(D2D1)2P2P1=(D2D1)3