A pump operates at a constant speed of 1500 rpm and delivers water through a 300...
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A pump operates at a constant speed of 1500 rpm and delivers water through a 300 m long pipeline to an elevated tank 20 m above the water level at the source. The pipeline has a diameter of 150 mm and a friction coefficient, f = 0.020. The pump, when running at the given speed, had the following characteristics: Table 3.1: Pump characteristics Discharge (L/s) Head (m) NPSH required (m) Efficiency (%) 142 127 113 85 36 57 28 16 24 44 53 57 9.1 63 6.7 4.3 3.6 59 3.0 71 70 33 a) Determine the operating conditions of the pump in terms of discharge, head, efficiency and power input. (13) With the pump station located at an elevation of 2.75 m above the water level at the intake and the length of the suction pipe being 55 m. Also, considering the local atmospheric pressure of 100 kPa and a vapour pressure of 3.5 kPa, calculate the NPSH available. b) (5) c) Determine whether the pump is under threat of cavitation and if so suggest what you would recommend in order to prevent it. A pump operates at a constant speed of 1500 rpm and delivers water through a 300 m long pipeline to an elevated tank 20 m above the water level at the source. The pipeline has a diameter of 150 mm and a friction coefficient, f = 0.020. The pump, when running at the given speed, had the following characteristics: Table 3.1: Pump characteristics Discharge (L/s) Head (m) NPSH required (m) Efficiency (%) 142 127 113 85 36 57 28 16 24 44 53 57 9.1 63 6.7 4.3 3.6 59 3.0 71 70 33 a) Determine the operating conditions of the pump in terms of discharge, head, efficiency and power input. (13) With the pump station located at an elevation of 2.75 m above the water level at the intake and the length of the suction pipe being 55 m. Also, considering the local atmospheric pressure of 100 kPa and a vapour pressure of 3.5 kPa, calculate the NPSH available. b) (5) c) Determine whether the pump is under threat of cavitation and if so suggest what you would recommend in order to prevent it.
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Related Book For
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
Posted Date:
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