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 7.21PP
The specifications for an automobile fuel pump state that it should pump
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A centrifugal pump, driven by a DC motor, running at 100 rpm delivers 500 gpm of water against
a total pumping head of 75 feet with a pump efficiency of 68%.
a. Specify the motor hp required.
b. Determine the resulting pump speed and capacity if the pump rpm is increased to product
a pumping head of 110 ft assuming the efficiency remains the same.
c. Can a 15 hp motor be used under the conditions indicated in item b?
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 hp
A system requires a pump to deliver 30 gal/min at 1500 lbf/in2 at an engine speed of 2000 rpm. calculate theoretical pump displacement, engine torque to drive the unit, and horsepower.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A small centrifugal pump is used to deliver 0.005 m/s of water to level 2 as shown in Fig. 2. Neglecting the losses, determine the required power input to the pump if its efficiency is equal to 70%. Level 2 30 m Pump Figure 2: Schematic diagram of task 2.arrow_forwardb. The discharge pressure of an air compressor is 6 times the suction pressure. If the volumeflow rate at the suction is 0.86 cubic meters per second, what is the compressor power (kW)for n = 1.38 and suction pressure is 101 kPaa?arrow_forward2. A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second? The correct answer has a margin of 1 from exact answer. Velocity head is neglected.arrow_forward
- Chearrow_forward1.1 Define centrifugal pumps and briefly discuss their operating mechanisms. 1.2 Write the reasons for throttling a pump. What do we do if we do not use throttling? 1.3 Discuss the occurrence of surges in water supply systems and state the potential mitigation mechanisms in big cities. Also explain how pressure surges affects water quality in water supply systems. 1.4 Suppose the selected centrifugal pump for our use is not available in the market. Discuss how you select another pump available in the market and how we can utilize that pump. 1.5 Derive an equation for the available NPSH for a pump is bellow the water in the suction reservoir. Support your derivation by drawing.arrow_forwardProblem 15.2 The figure below shows a showerhead at a kiddie pool in a waterpark. Water flows up through the center and some water exits through the shower head on the right (which vents directly to outside air at atmospheric pressure), while the remaining water exits via a pipe to the left. Mass flow rates, absolute pressures (P₁, P3), velocities, and areas are as shown in the figure. The entire system is held in place both horizontally and vertically by a collar at the connection to the ground. The mass of the pipes plus the water is given as mp+w. Use CoM and COLM principles to develop expressions suitable for calculating the x and y components of the reaction at the collar. m3, V3, P3, A3 m2, V2, PAtm, A2 e Collar m₁, v₁, P₁, A₁arrow_forward
- A boiler feed pump receives 60 liters/sec of water with specific volume of 0.00112 m3/kg at a head of 750 m. What is the power output of driving motor if pump efficiency is 65%?arrow_forward2. Draw a neat sketch of Reciprocating Pumps and explain it working principlearrow_forwardIn order to meet the stated goal of delivering 4 gallons per minute at a height of 670 meters, a single pump must have a maximum flow rate of 40 gpm. How many stages are needed if the speed cannot exceed 1352 rpm?arrow_forward
- Differentiate between Centrifugal and Reciprocating Pumps in detail by examples and their applicationsarrow_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_forwardExplain Reciprocating pump? List the components of a reciprocating pump and briefly describe each one's role.arrow_forward
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