(Solved): 8.7 Changing the speed of a centrifugal pump will change its operating characteristics, including t ...

8.7 Changing the speed of a centrifugal pump will change its operating characteristics, including the head. Determine the new head, if $$\begin{array}{l}{H}_1=\text{ rated head }=120\mathrm{ft}=36.58\mathrm{m}\\ N_2=\text{ pump speed now }=1,320\mathrm{rpm}\\ N_1=\text{ rated pump speed }=1,650\mathrm{rpm}.\end{array}$$ 8.8 Changing the speed of a centrifugal pump will change its operating characteristics, including the power requirement. Determine the new power requirement, if $$\begin{array}{l}{P}_1=\text{ rated head }=16\mathrm{hp}=12\mathrm{kW}\\ N_2=\text{ pump speed now }=1,320\mathrm{rpm}\\ N_1=\text{ rated pump speed }=1,650\mathrm{rpm}\end{array}$$