A centrifugal pump lifts water against of 0.08 m, major losses in the suction side h,, = EN m and in the discharge side hin is 3 m. The pump impeller has a diameter of 0.15 m, exit width of0.015 m, exit blade angle of 22° and speed ofN= 20EN rpm The hydraulic efficiency is 0.85. If the flow at the entrance is radial, find the discharge, pump head, atmospheric pressure Pa. vapor pressure P, and maximum allowable height of the pump from the feeding tank water surface elevation if the pump is operating under T= 25 °C at altitude H= 20EN m. static !! o, = NPSH, H, =1.21x10*N !! $256 Ply =10.33(1-2.256×10H

A centrifugal pump lifts water against of 0.08 m, major losses in the suction side h,, = EN m and in the discharge side hin is 3 m. The pump impeller has a diameter of 0.15 m, exit width of0.015 m, exit blade angle of 22° and speed ofN= 20EN rpm The hydraulic efficiency is 0.85. If the flow at the entrance is radial, find the discharge, pump head, atmospheric pressure Pa. vapor pressure P, and maximum allowable height of the pump from the feeding tank water surface elevation if the pump is operating under T= 25 °C at altitude H= 20EN m. static !! o, = NPSH, H, =1.21x10*N !! $256 Ply =10.33(1-2.256×10H

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Water is pumped from a supply reservoir to a ductile iron water transmission line. The high point of the transmission line is at point A 1 km downstream of the supply reservoir and the low point of the transmission is at point B 1 km downstream of point A. If the flow rate through the pipeline is 1m³/s the diameter of the pipe is 750mm and the pressure at A is to be 350 kPa. A) estimate the head that must be added by the pump. B) estimate the power supplied by the pump. C) calculate the water pressure at B.
El. 200 m A Res. H-W L Pipe B pipec →Negleet minor losses → Pipes B, C, and E are all have: Pipe E = 600 m long d = 500 mm f = 0.03 → When the Pump develops 15m of head, the Velocity in pipe C is 5 m/s. Find : a) the flowrate in all pipes. b) the elevation of the discharg end of Pipe E.
Problem 2: A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radial at the inlet of the rotor. The pump has the following characteristics: Flow rate Inlet diameter Outlet diameter Head Width at the inlet Width at the outlet Leakage Mechanical loss Blade angle at the outlet The water density Atmospheric pressure |Q=72 L/s DI = 90 mm D2 = 280 mm H= 25m bl -20 mm b2 = 18 mm q =2 L/s Pm = 1.41 kW B2 = 35 p = 998 kg/m³ 101 kPa
Benzene at 37.8 °C is pumped through the system of Figure at the rate of 0.1515 m3/min. The reservoir is at atmospheric pressure. The gauge pressure at the end of the discharge line is 345 kN/m². The discharge line is 1.828 m above the pump, while the pump suction is 0.821 m below the level in the reservoir. The discharge line is 1.5-in. Schedule 40 steel pipe. The head friction in the suction line is 0.4066 m and in the discharge line is 4.4664 m. The mechanical efficiency of the pump is 60%. The density of benzene is 865 kg/m³ and its vapor pressure at 37.8 °C is 26.2 kN/m². a) Calculate the total power input. b) Evaluate whether the pump is suitable for this system when the pump manufacturer specifies a Net Positive Suction Head Required (NPSHR) of 3.05 m.
3. A pump is used to transport water at the rate of 0.075 m³/s from a reservoir 20 m above the pump to a free discharge 35 m above the pump. The pressure on the intake side of the pump is 150 kPa and the pressure on the discharge side is 450 kPa. All pipes are commercial steel of 15 cm inner diameter. Determine (a) The head supplied by the pump (b) The total head loss between the pump discharge and point of free discharge. Z₁=20 m 1 P₂ = 150 kPa 2 面 3 D=15 cm A P3=450 kPa 4 Free Discharge Z4 = 35 m
B. Determine the discharge in the pipe and the pressure at point Water T 1.5 m 3.5 m B 40 cm diameter -20 cm-diameter nozzle
Determine the available NPSH for the system shown in Fig. 13.38 (b). The fluid is water at 80°C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below the pump inlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius type. Neglect the loss in the reducer. The foot valve and strainer are of the hingeddisk type. The flow rate is 300 L/min.
A pitot-static tube placed in the centre of a 300 mm pipe line has one orifice point- ing upstream and other perpendicular to it. The mean velocity in the pipe is 0.80 of the central velocity. Find the discharge through the pipe if the pressure difference between the two orifices is 60 mm of water. Take the co-efficient of pitot tube as C = 0.98.
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In a pump the suction and delivery pipes are of the same size and are at the same level. At a given discharge the loss of head between a point A on the suction side and a point B on the delivery side is 3.0 m. If the pressure at point B is 120 kPa and the head developed by the pump is 10 m, the pressure at point A, in kPa is (Water is the flowing fluid)
Water flows from Resorvoir A (Elev 133 m.) to a turbine (Elev 76 m.) then discharges into tailtrace B (Elev 30 m.) as shown. the head loss from (A) to (1) is 2 times the velocity head in the pipe, and the head loss from (2) to (b) is 1.49 times the velocity head in the pipe. if the flow rate in the pipe is 35 ft63/S, diameter of all pipes is 25 in., calculate the horsepower generated by the turbine. Use 1 hp = 550 lb-ft/s.
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