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The pump in Fig. 7.20 delivers water from the lower to the upper reservoir at the rate of
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Chapter 7 Solutions
Applied Fluid Mechanics (7th Edition)
- Q1. The pump with 96.52 cm in diameter characteristics shown in figure below is used to pump water to the system. Neglecting local losses, www a) Calculate flow rate and pump power. b) A new pump from the family with 60 cm in diameter is produced. It oparates with the speed of n=1500 rpm and used to pump gasoline (SG=0.86). Estimate discharge, head and power of the new pump. Note Pipe is cast iron with 0.5 m in diamater and 900 m in length. Fluid is water with density 1000 kg/m³. Take f=0.02 in the analysis. www (a) hil n=710 d'dak 72m 120 7.5 ENPY 105 - 105.4 cm çap 4.5 90 96.52 cm çap 75 - 88.9 cm çap 60 48m 45 30 0.25 0.50 0.75 1.00 1.25 1.50 1.75 Debi ms ENPY m 98 %88 1100 kW 900 kW 750kW Yak, marrow_forwardWater is pumped through a vertical 5.0 cm cement-lined steel pipe to an elevated tank on the roof of a building. The measured pressure at the discharge side of the pump is 1380 kPa. What pressure can be expected at a point in the pipe 76 m above the pump when the flow is 9.5 L/s? Use f= 0.023. Include the diagram in your solution. a.100 kPa b.150 kPa c.75 kPA d.225 kPaarrow_forward5. 10 lt / s of water is requested to be transported from A depot to city B. The water level of the A depot is 50 m and the B point is 30 m. The length of the EU pipe in the project has been calculated as 1000m and taken as f = 0.02. The pipe diameter has been chosen as φ90 mm. Since the minimum operating pressure (pressure head) required at point B is 20m, can water be delivered to point B with this system? (Velocity height is negligible)arrow_forward
- 1. Water from a reservoir passes over a dam through a turbine and discharges from a 60-cm ID pipe at a point 40 m below the reservoir surface. The turbine delivers 1 MW. a. Draw the system and write the relevant form of the mechanical energy balance. b. Calculate the required flow rate of water in m3/min if friction is neglected. (Note: The equation you will solve in this problem has multiple roots. Find a solution that is physically relevant.) c. If friction were included, would a higher or lower flow rate be required?arrow_forwardIn the system, 900 L/min of oil is pumped with (s=0.92), from an underground storage tank to the first stage of a processing system. If the loss in the suction line is 1.5m and the loss in the discharge line is 4.5m. The suction line is 2.5” and the discharge line is 1.5”. Determine a) the outlet pressure in psi of the pump. b) The power in hp of the pumparrow_forwardIn the figure shown, it is desired to pump 40 L/s of water from a natural stream to a small reservoir. The stream is connected to the small reservoir using 3 pipes with properties provided in the table. The overall pump efficiency is 70%. Neglect minor losses. a) Calculate the flow rates in pipes 2 and 3. b) Calculate the mechanical head supplied by the pump to the flow. c) Compute the electric power input required by the pump. Pipe Length Diameter Friction (m) (mm) Factor 1 1000 El. 90 m 250 0.015 2 500 160 0.022 3 600 200 0.025 1 El. 30 marrow_forward
- For the single pump-pipe system below, what will be the changes for the operating point if we increase the pipe size but decrease the shaft speed of the pump? EB H₂ O The operating point will remain the same. O The operating point will occur either at a higher discharge or at a lower discharge, depending on the specific influence of each change. O The operating point will occur at a higher discharge. O The operating point will occur at a lower discharge.arrow_forwardA fully-filled open storage tower of height 32 m and diameter 3.0m supplies water to a house. A horizontal pipe at the base of the tower has a diameter of 2.54cm. To satisfy the needs of the home, the supply pipe must be able to deliver water at a rate of 0.67 gal/s. a. If water were flowing at the maximum rate, what would be the pressure in the horizontal pipe?b. A smaller pipe, of diameter 1.27 cm supplies the second floor of the house, a distance of 7.2 m above the ground level. What are the flow speed and water pressure in this pipe?arrow_forwardA large container filled with water and uncovered for use in fighting fires in an ethylene production plant. Water from this tank is pumped into the nozzle when needed use. This fire suppression system is designed to be able to transmit 1890 L/min of water at a pressure of 15 bar (relative pressure). If we ignore the difference in height between the water level in the tank and pump, there is no change in diameter of pipe and nozzle, pump efficiency is 70%. Ask how much work (hp) is required to the pump to achieve the desired pressure and flow would like?arrow_forward
- Seven hundred gpm of water are being discharged by a centrifugal pump 5 ft. above the pump inlet. The inlet pressure is 4-in Hg above atmospheric and the discharge pressure is 29 psia. Assume the pump input is 8 hp, if the pump has an 8-inch diameter inlet and a 4-inch diameter discharge: 1.How much pressure loss in the pump? a. 28.4 ft-lbf/lb b. 5 ft-lbf/lb c. 4.7 ft-lbf/lb d. 38.1 ft-lbf/lb 2. How much is the velocity loss in the pump? a. 28.4 ft-lbf/lb b. 45.3 ft-lbf/lb c. 4.7 ft-lbf/lb d. 38.1 ft-lbf/lb 3. If the pump speed is increased from 1600 to 2400 rpm, what will be the new net flow rate in the pump? a. 800 gpm b. 1050 gpm c. 1400 gpm d. 1965 gpm 4. Find the new brake horse power if the pump speed in increased from 1600 to 2400 rpm. a. 64 hp b. 20.25 hp c. 8 hp d. 30.375 hparrow_forward3. Based from the pump performance curve below, calculate the following: a) Specific speed b) Suction Specific speed. 250 100 MCSF 25.12 in Maximum 200 80 21.77 in Rated 150 60 Efficiency 20.08 in Minimum 100 40 NPSH3 50 2 20 50 100 150 200 250 300 350 400 450 Head - m NPSH3 - m Efficiencyarrow_forward1. As a junior city engineer of a municipality, you are tasked to design the specifications of the pump with 3650 cu.m/day. The water source in the municipality is from an open reservoir and will supply to a pressure tank that will distribute to the municipality. open 4l Pressure reservoir Tank 70 m 15 m Pump Determine the following specifications of the pump and piping system (assume fluid stagnation at the pump). Velocity head at pt.1 to 2 if the diameter of the pipe is a.) 200 mm b.) Suction pressure of the pump in kPa (Pressure at pt. 2). c.) Velocíty head at pt.3 to 4 if the diameter of the pipe is 150 mm d.) Discharge pressure of the pump in kPa (Pressure at pt. 4). Assume atmospheric pressure at the pump. If an air vent is installed at the pipe just right before the pressure tank with diameter of 20 mm, what is the velocity of discharge in m/s? The height of the pressure tank is 12 m, what is the flowrate in cu.m/hr at pt.5 if the diameter of the pipe is 150 mm? e.) f.)arrow_forward
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