Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Refer 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)?
Q Consider the following data relating toperformance of a centrifugal pump:speed 1200 rpm, flow rate 30 L/s, head 20 m, and power 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency isunaltered, Find the new flow rate and head.
A centrifugal pump delivers 2.5 cfs of water against a head of 25 ft at 1500 rpm and requires 10 hp. If the speed is reduced to 1250 rpm calculate the flow (in m^3/s), assuming the same efficiency.
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 submersible pump of 80 percent efficiency is used in pumping water with flow rate,Q from a river to a pool at an elevation, h. The frictional losses is assumed with losscoefficient, K = 10. By the aid of a labelled diagram, derive an expression on thepower require to drive the pump.arrow_forwardSolve fast with Proper Equation. 1. A centrifugal pump delivers 2.5 cfs of water against a head of 25 ft at 1500 rpm and requires 10 hp. If the speed is reduced to 1250 rpm calculate the power , assuming the same efficiency. Select one: a. 17.3 kW b. 13.7 kW c. 5.8 kW d. 8.5 kWarrow_forwardThis is a fluid machine question. 1. A single stage centrifugal pump delivers 900 m^3/hr of sea water from a source where the water where the pressure is O.125 mpag. The pump discharges into surge tank rated at 300 psig, 3 m above the pump centerline. Loss of head due to friction in suction is 0.8 m and that in the discharge side is 3 m . Calculate the power required by the pump in kW. 2. An atmospheric tank at standard ambient conditions will serve as the source for a pump. It is calculated the length of the suction pipe is 200 m with friction factor of 0.02. What would be the minimum height of water level in the tank that must be maintained above the centerline of the pump to avoid cavitation? Pump specifications are as follows: Flow: 225 cu.m/hrHead: 20 mPower: 15 kNSuction flange and Pipe Diameter: 200 mmDischarge Flange and Pipe Diameter: 150mmNPSHa: 6.5 mNSPHr : 6marrow_forward
- Consider the following data relating toperformance of a centrifugal pump:speed 1200 rpm, flow rate 30 L/s, head 20 m, and power 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency isunaltered, Find the new flow rate and head.arrow_forwardA single stage centrifugal pump has an impeller of 250 mm diameter which rotates at 1,800 rpm and lifts 60 lit/sec to 25 m with an efficiency of 70%. Obtain the number of stages and diameter of each impeller of a similar multi-stage pump to lift 75 lit/sec to 175 m at 1,500 rpm. (8 stages ; 280 mm dia)arrow_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 discharging 10 lps against 25 m of head and operating with an efficiency of 60% requires 4.1 kW at 1000 rpm. What is the theoretical discharge if the speed is increased to 1500 rpm assuming the efficiency remains constant? What is the theoretical head and kW at 1500 rpm?.arrow_forwardA centrifugal pump has the following specifications: d1 = 12 in., d2 = 24 in., b1 = 2 in., b2 = 1 in., angle beta1 = 18 degrees, angle beta2 = 11 degrees and rotates at 1250 rev/min. Estimate the power, HP.arrow_forwardA centrifugal pump equipped with a variable frequency (speed) drive running at 3500 rpm is discharging 240GPM corresponding to a head of 287ft. The horsepower is 35.5. if the pump's speed is reduced to 2900 rpm, what will be the revised flow rate? Select the correct response: 176.21 gpm 76.21 gpm 89.66 gpm 98.85 gpm 289.66 gpm 198.86 gpmarrow_forward
- 1. A piston positive- displacement pump has a 6-in. diameter and a 2.5-in. stroke. Its crankshafts rotates a 300 rpm. (a) calculate its output at 100%volumetric efficiency in gpm. (b) If the pump delivers water against a total head of 24 ft, what horsepower is required at 72% efficiency?arrow_forwardA 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?arrow_forwardA 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.arrow_forward
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