Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 13, Problem 13.40PP
Compute the specific speed for a pump operating at
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A 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?
A centrifugal pump is designed to operate at 1800 revolutions per minute and with a head of 55 meters. Calculate the speed reduction that occurs when the impeller diameter is reduced from 300 to 250 mm.
A test on centrifugal pump operating at 3463 rpm showed a total head of 48 ft at a capacity of 900 gpm. Estimate the total head and capacity of the pump if it were operated at 1750 rpm. Assume normal operation at point of maximum efficiency in each case.
Chapter 13 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 13 - List 12 Factors that should be considered when...Ch. 13 - List items that must be specified for pumpsCh. 13 - Describe a positive-displacement pump.Ch. 13 - Name four examples of rotary positive-displacement...Ch. 13 - Name three types of reciprocating...Ch. 13 - Describe a kinetic pumpCh. 13 - Name three classifications of kinetic pumps.Ch. 13 - Describe the action of the impellers and the...Ch. 13 - Describe a jet pumpCh. 13 - Distinguish between a shallow-well jet pump and a...
Ch. 13 - Describe the difference between a simplex...Ch. 13 - Describe the general shape of the plot of pump...Ch. 13 - Describe the general shape of the plot of total...Ch. 13 - To the head-versus-capacity plot of Problem 13.13...Ch. 13 - To what do the affinity laws refer in regard to...Ch. 13 - Fora given centrifugal pump, if the speed of...Ch. 13 - For a given centrifugal pump, if the speed of...Ch. 13 - For a given centrifugal pump, if the speed of...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - Describe each part of this centrifugal pump...Ch. 13 - For the line of pumps shown in Fig.13.22 specify a...Ch. 13 - For the line of pumps shown in Fig. 13.22 ,...Ch. 13 - For the 2x310 centrifugal pump performance curve...Ch. 13 - For the 2310 centrifugal pump performance curve...Ch. 13 - Using the result from Problem 13.26 describe how...Ch. 13 - For the centrifugal pump performance curve shown...Ch. 13 - Prob. 13.29PPCh. 13 - State some advantages of using a variable-speed...Ch. 13 - Describe how the capacity, efficiency, and power...Ch. 13 - If two identical centrifugal pumps are connected...Ch. 13 - Describe the effect of operating two pumps in...Ch. 13 - For each of the following sets of operating...Ch. 13 - For the 112313 centrifugal pump performance curve...Ch. 13 - For the 6817 centrifugal pump performance curve...Ch. 13 - Figure 13.52 shows that a mixed-flow pump is...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - It is desired to operate a pump at 1750 rpm by...Ch. 13 - Define net positive suction head (NPSH).Ch. 13 - Distinguish between NPSH available and NPSH...Ch. 13 - Describe what happens to the vapor pressure of...Ch. 13 - Describe why it is important to consider NPSH when...Ch. 13 - For what point in a pumping system is the NPSH...Ch. 13 - Discuss why it is desirable to elevate the...Ch. 13 - Discuss why it is desirable to use relatively...Ch. 13 - Prob. 13.50PPCh. 13 - If we assume that a given pump requires 7.50 ft of...Ch. 13 - Determine the available NPSH for the pump in...Ch. 13 - Find the available NPSH when a pump draws water at...Ch. 13 - A pump draws benzene at 25 C from a tank whose...Ch. 13 - Determine the available NPSH for the system shown...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Repeat Problem 13.56 if the pump is 44 in below...Ch. 13 - Repeat Problem 13.59 if the pump is 27 in above...Ch. 13 - Repeat Problem 13.57 if the pump is 1.2 m below...Ch. 13 - Repeat Problem 13.58 if the pump is installed...Ch. 13 - A pump draws propane at F (sgfrom a tank whose...Ch. 13 - A pump draws propane at 45 C (sg =0.48 ) from a...
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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 double-suction centrifugal pump delivers 3 m3/s of water at a head of 15 m and running at 1200 rpm. Calculate the specific speed of the pump.arrow_forwarda pump is delivering 160 liters per sec of water using an impeller diameter of 240 mm and operating at a speed of 1800 rpm. if the speed held constant and the impeller diameter is change to 203.2 mm, what is the new dischange og the pump in liters per secondarrow_forwardIt is desired to deliver 750 gpm at a head of 340 ft. A multistage pump will be used with a rotative speed of 1745 rpm. If the specific speed for a single impeller is 2018, how many stages are required?arrow_forward
- It is required to deliver 324 gpm against a head of 420 ft at 3600 rpm. Assuming acceptable efficiency of pump at specific speeds of the impeller between 1200 and 4000 rpm when flow Q is in gpm how many pumping stages should be used?arrow_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 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. Choices: 45 ft 60 ft 29 ft 18 ftarrow_forward
- A radial bladed centrifugal pump running at 1440 rpm is to deliver 30 l/min of water against a head of 20 m. Assuming flow velocity as 3 m/s. Determine the diameter and width of the impeller at the outlet.arrow_forwardA three-lobe positive displacement pump pumps 0.3 cubic centimeters of oil on each love as the pump operates at a speed of 750 rpm. Calculate the volume flow rate of the pump in liters per minute.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 jet of water from a nozzle discharging into air has a diameter of 6 in and a mean velocity of 120 ft per second. Compute the velocity head and horsepower in the jet.arrow_forwardThe two-lobe rotary pump moves 0.145 gal of a coal slurry in each lobe volume Vlobe. Calculate the volume flow rate of the slurry (in gpm) for the case where n. = 220 rpm.arrow_forwarddetermine the specific speed by a pump delivering 5gpm when running at 1350 rpm if the head required is 96inchesarrow_forward
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