Q9. A centrifugal pump runs at 400 rev/min and delivers a liquid at the rate of 160 tonne per hour. The impeller diameter is 900 mm and at exit the blades are backward facing at an angle of 30° to the plane of rotation.
There is no whirl at inlet and the fluid has a constant radial velocity through the impeller. Suction is from a tank 1.2 m below the pump and delivery is to a tank 18.4 m above the pump.
The delivery pipe has an internal diameter of 200 mm, a length of 60 m and a friction factor coefficient of 0.06. Valves and bends in the system create a loss equivalent to an additional 24 m of pipeline. Suction line losses can be ignored.
Calculate EACH of the following:
a) The system total head; (7)
b) The pump power (2)
c) The width of the impeller at exit. (7)
Note: for the fluid, ρ = 900 kg⁄m3
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