Problem 3. A pump is installed in a 250-m-long pipeline to raise water (v = 1 x 10-6 m²/s)55 m from a reservoir to an elevated tank. The pipe is ductile iron with a diameter of 80cm and a flow rate of 2.19 m³/s. The pump is placed outside the supply reservoir with acenterline elevation of 1.5 m below the reservoir water surface. Determine the maximumdistance, Lmax, in meters that the pump could be installed away from the supply reservoir(the allowable length of the suction line) without encountering cavitation problems. Therequired net-positive suction head is NPSH = 4.75 m and the water is at 30° C.Total minor losses for the entire pipeline are 17.8 times the velocity head, including exit loss.Minor losses in the suction line are 5.0 times the velocity head. Use an atmospheric pressureof 101.0 kPa.Lmax1.50 m80 cm diameterP

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Answered: Problem 3. A pump is installed in a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A water pump is used to pump the water to a large water tank as shown in Figure. The free surfaces of both water tanks are under atmospheric pressure. Dimensions and local losses are given below. The flow rate of the pump is determined as 16.2 L/min. Calculate the required manometric head of the pump and the required motor power if the total efficiency is 76.2 percent. The water at 10oC. density r = 996.2 kg/m3, dynamic viscosity µ = 1.362x10-3kg /ms. z2-z1 = 7.62 m (height difference), D = 2.62 cm (pipe diameter), L = 176.2 m (total pipe length), ɛ = 0.2562 mm (pipe roughness value) Local loss coefficients: KL,inlet = 0.562 (pipe inlet) KL,valve = 16.2 (valve), KL,elbow = 0.9262 (there are 5 elbows totally in pipe line), KL,outlet = 1.0562 (pipe outlet).
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