Example – Fire-Fighting Pump Given: A self-priming pump is used to draw water from a lake and shoot it through a nozzle, as sketched. The diameter of the pump inlet is D1= 12.0 cm. The diameter of the nozzle outlet is D2= 2.54 cm, and the average velocity at the nozzle outlet is V2= 65.8 m/s. The pump efficiency is 80%. The vertical distances are ∆z1= 1.00 m and ∆z2= 2.00 m. The irreversible head losses in the piping system (not counting inefficiencies associated with the pump itself) are estimated as hL= 4.50 m of equivalent water column height. Note: Later on, in Chapter 8, you will learn how to calculate the irreversible head losses associated with piping systems on your own. For now, it is given. V2Pump D2Input shaft power ωV2D1∆z1∆z2θ(a) To do: Calculate the volume flow rate of the water in units of m3/hr and gallons per minute (gpm).
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Horsepower, 2.54 cm, 2.00 m, 1.00 m, 0.0254 m, 4.50 m