Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 7, Problem 7.20PP
A manufacturer's rating for a gear pump states that
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If a pump with a manometric head of 12 m is designed to deliver a flow rate of 7500 liters / minute. Since the rotation speed of the pump shaft is 1800 rpm, what is the dimensionless pump specific speed of this pump?
A single-stage centrifugal pump has an impeller speed of 1750 rpm. If the flow rate of water is 60 gal/min, determine the expected head.
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45 ft
60 ft
29 ft
18 ft
What is the power ratio of a pump to its 1/5 scale model if the ratio of the heads is 4 to 1?
Chapter 7 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 7 - A horizontal pipe carries oil with a specific...Ch. 7 - Water at 40 F is flowing downward through the...Ch. 7 - Find the volume flow rate of water exiting from...Ch. 7 - A long DN 150 Schedule 40 steel pipe discharges...Ch. 7 - Figure 7.14 shows a setup to determine the energy...Ch. 7 - A test setup to determine the energy loss as water...Ch. 7 - The setup shown in Fig. 7.16 is being used to...Ch. 7 - A pump is being used to transfer water from an...Ch. 7 - In Problem 7.815 (Fig. 7.17), if the left-hand...Ch. 7 - A commercially available sump pump is capable of...
Ch. 7 - A submersible deep-well pump delivers 745 gal/h of...Ch. 7 - In a pump test the suction pressure at the pump...Ch. 7 - The pump shown in Fig. 7.19 is delivering...Ch. 7 - The pump in Fig. 7.20 delivers water from the...Ch. 7 - Repeat Problem 7.14, but assume that the level of...Ch. 7 - Figure 7.21 shows a pump delivering 840L/min of...Ch. 7 - Figure 7.22 shows a submersible pump being used to...Ch. 7 - Figure 7.23 shows a small pump in an automatic...Ch. 7 - The water being pumped in the system shown in Fig....Ch. 7 - A manufacturer's rating for a gear pump states...Ch. 7 - The specifications for an automobile fuel pump...Ch. 7 - Figure 7.26 shows the arrangement of a circuit for...Ch. 7 - Calculate the power delivered to the hydraulic...Ch. 7 - Water flows through the turbine shown in Fig....Ch. 7 - Calculate the power delivered by the oil to the...Ch. 7 - What hp must the pump shown in Fig. 7.30 deliver...Ch. 7 - If the pump in Problem 7.26 operates with an...Ch. 7 - The system shown in Fig. 7.31 delivers 600 L/min...Ch. 7 - Kerosene (sg = 0.823 ) flows at 0.060m3/s in the...Ch. 7 - Water at 60 F flows from a large reservoir through...Ch. 7 - Figure 7.34 shows a portion of a fire protection...Ch. 7 - For the conditions of Problem 7.31 and if we...Ch. 7 - In Fig. 7.35 kerosene at 25 F is flowing at 500...Ch. 7 - For the system shown in Fig. 7.35 and analyzed in...Ch. 7 - Compute the power removed from the fluid by the...Ch. 7 - Compute the pressure at point 2 at the pump inlet.Ch. 7 - Compute the pressure at point 3 at the pump...Ch. 7 - Compute the pressure at point 4 at the press...Ch. 7 - Compute the pressure at point 5 at the press...Ch. 7 - Evaluate the suitability of the sizes for the...Ch. 7 - The portable, pressurized fuel can shown in Fig....Ch. 7 - Professor Crocker is building a cabin on a...Ch. 7 - If Professor Crocker's pump, described in Problem...Ch. 7 - The test setup in Fig. 7.39 measures the pressure...Ch. 7 - If the fluid motor in Problem 7.44 has an...Ch. 7 - A village with a need for a simple irrigation...Ch. 7 - As a member of a development team for a new jet...Ch. 7 - A fire truck utilizes its engine to drive a pump...Ch. 7 - A home has a sump pump to handle ground water from...Ch. 7 - In Problem 6.107 an initial calculation was made...Ch. 7 - A creek runs through a certain part of a campus...Ch. 7 - A hot tub is to have 40 outlets that are each 8 mm...Ch. 7 - A large chipper/shredder is to be designed for use...
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- A hydraulic pump is observed to have an overall efficiency of 87% and a volumetric efficiency of 94% while consuming 10 Bhp measured at the pump drive shaft. Compute the mechanical efficiencyarrow_forwardThe motor of the pimp consumes 1.05 hp of electricity. The pump increases the pressure of water from 120 kPa to 1100 kPa at a rate of 35 L/min. If the motor efficiency is 95%, the pump efficiency is note: indicate free body diagramarrow_forwardA Centrifugal pump operates at a speed of 1450 rpm and discharge of 250 m³/hr against a head of 40m and efficiency=55%. 1- Calculate the pump power 2- Compute the discharge, head, and pump power if the pump speed were changed to 2900 r/min?arrow_forward
- A centrifugal pump develops a head of 16.8 m at 1500 rpm. Rated capacity is 0.015 m3/s. Determine the size of the impeller in mm if Øe=0.45.arrow_forwardA pump operating at 1750 rpm delivering 500 gpm against a total head of 150 ft. Changes in the piping system have increased the total head to 360 ft. At what rpm should the pump be operated to achieve this new head at the same efficiency?arrow_forwardThe pressure at the suction of the pump reads 8 psi vacuum, while at the discharge is 41 psi. The difference in elevation between the suction and discharge side is 1.6 ft. The diameter at suction is 7.2 in, while at the discharge is 4.5 in. Calculate the power delivered by the pump in hp if it delivers 1800 gpm. Write your answer to 1 decimal place. Answer:arrow_forward
- assume a flow of 1.7 m3/hr. the pressure readings are 0.1 bar at the bare pump and 0.3 at the integral pump when they are connected in series. calculate the corresponding heads of the above pumps connected in series. what happens if the pumps are connected in parallel? Please correct answerarrow_forwardRefer to the “composite performance chart” for a Goulds 3x4-10centrifugal pump operating at 1750 rpm. It shows the pump performance curve for 5 differentimpeller sizes, but also shows the HP required, efficiency, and NPSH required at differentoperating points.Describe the performance of this pump, using an 8 inch impeller and a required flow rate of175 gpm. Give head available, power required (BHP), efficiency, and NPSH req’d. What is the water horsepower (WHP)?arrow_forwardA pump operating at 2,000 Ibf/in? and delivering 5 gal/min requires 7 bhp to drive the input shaft. Compute the overall efficiency of the pump.arrow_forward
- A pump with an impeller diameter of 300 mm running at a speed of 2950 rev/min delivering 450 L/min of water at a head of 350 kPa is going to be replaced by a geometrically similar spare pump running at a speed of 1450 rev/min delivering the same flow rate and head. Determine the impeller size of the spare pump and the percentage increase (decrease) of power required for the spare pump. OL. 380.1 mm; a decrease of 61.33% OI., 380.1 mm; an increase of 38.77% I. 147.5 mm; an increase of 3.4% IV. 210.3 mm; a decrease of 83.1%arrow_forwardWhat is the horsepower requirement for a water pump, if the required flow rate is 200 gpm and the required pressure increase assigned to the pump is 32 psi?arrow_forwardA water pump develops a total head of 200 ft. The motor efficiency is 87.5%. If the power rate is 1.5 cents per kw-hr, what is the power cost in cents per minute for pumping 1000 gal/hrarrow_forward
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