Water at 16,2°C is to be discharged from a reservoir at a rate of 16,2 L/s using two horizontal cast iron (roughness value ɛ=0.00026m) pipes connected in series and a pump between them. The first pipe is 26,2 m long and has a 66,2 mm diameter, while the second pipe is 36,2 m long and has a 46,2 mm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged (KL=0.562), and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head, the minimum pumping power and electric motor power for total efficiency value of 76,2% to maintain the indicated flow rate. Water density is r=996,2 kg/m3, dynamic viscosity µ= 1.162x10-3kg/ms. Solve the problem by making the necessary assumptions and drawing the schematic figure.
Water at 16,2°C is to be discharged from a reservoir at a rate of 16,2 L/s using two horizontal cast iron (roughness value ɛ=0.00026m) pipes connected in series and a pump between them. The first pipe is 26,2 m long and has a 66,2 mm diameter, while the second pipe is 36,2 m long and has a 46,2 mm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged (KL=0.562), and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head, the minimum pumping power and electric motor power for total efficiency value of 76,2% to maintain the indicated flow rate. Water density is r=996,2 kg/m3, dynamic viscosity µ= 1.162x10-3kg/ms. Solve the problem by making the necessary assumptions and drawing the schematic figure.
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