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 13.17PP
For a given centrifugal pump, if the speed of rotation of the impeller is cut in half, how does the total head capability change?
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Shown in the Figure is the complete pump performance chart for a 3×4-10 centrifugal pump at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head of 50 ft.
(3) What is the power required for the selected impeller? _________
A.
5 hp
B.
4.2 hp
C.
2.2 hp
D.
3.2 hp
IF THE IMPELLER OF A CENTRIFUGAL PUMP IS KEPT THE SAME AND THE SPEED VARIED, THE PUMP OUTPUT SHALL CHANGE IN ACCORDANCE TO WHAT EQUATION?
Draw Head –Capacity curve of centrifugal pump at varying pumping speeds.
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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- A single-stage centrifugal pump has an impeller speed of 1750 rpm. If the flow rate of water is 60 gal/min, what is the expected head ?arrow_forwardShown in the Figure is the complete pump performance chart for a 3×4-10 centrifugal pump at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head of 50 ft. (1) Which impeller should be selected? _________ A. 9 in B. 8 in C. 7 in D. 10 inarrow_forwardWhat is performance characteristics of a centrifugal pumparrow_forward
- PROBLEM 3. A centrifugal pump is powered by a direct drive induction motor is needed to dischagre 150gal/min against a total head of 180 feet when turning at a fully loaded speed of 3500 rpm. What is the specific speed of the pump?arrow_forward12. What will be the rated capacity (in gpm) of a 4-1/2 inch impeller centrifugal pump operating at a speed of 345O rpm capable of generating a head of 40 ft or water? O 248 320 O 134 O 95arrow_forward1. If the pump rotated at 2000 rpm and instead and used a 9" impeller, what would the head be when moving 400 gallons per minute? 2. How much input power would be required to move 200 gpm of gasoline in the pump described in the chart with an impeller diameter of 8 3/4"?arrow_forward
- For a given centrifugal pump, if the impeller diameter remains constant, but the rotational speed is halved, the developed head by the pump will decrease by a factor of four. True or Falsearrow_forwardA centrifugal pump has NPSH required of 21 ft. The water temperature is 90oF and the friction loss at suction is 1.2 ft. The pump takes water from an open tank below the pump centerline. Determine the maximum static elevation at suction. (Note: @90oF: Psat = 0.69 psia and = 0.01608 ft3/lb).arrow_forwardwhat is a positive displacement pump? In what ways does it differ from a centrifugal pump.arrow_forward
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