Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 18, Problem 18.28PP
For an aeration process, a sewage treatment plant requires
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Problem 2. Water at 150°F is pumped at the rate of 60 gal/min from a reservoir at atmospheric
pressure. The gauge pressure at the end of the discharge line is 42 psi. The discharge point is 12 ft above
the level is the reservoir and the suction line is 6 ft above the level of the reservoir. The discharge line is
a 1 ½ in. nominal dimeter steel pipe with a schedule number of 80. The pressure drop due to friction in
the suction line is known to be 0.8 psi, and that in the discharge line is 7.2 psi. The mechanical efficiency
of the pump is 70%. Calculate (a) the developed head of the pump and (b) the total power input. (c) If the
pump manufacturer specifies a required NPSH of 8 ft, will the pump be suitable for this service?
Problem Statement
Water at 60°F and one atmosphere is being transferred from
tank 1 to tank 2 with a 2-hp pump that is 75% efficient, as
shown in Figure 8-7. All the piping is 4-inch schedule 40
steel pipe except for the last section, which is 2-inch
schedule 40 steel pipe. All elbows are 4-inch diameter, and a
reducer is used to connect to the 2-inch pipe. The change in
elevation between points 1 and 2 is z2 - z1 = 60 ft.
Tank 1
6 ft
4-inch
15 ft
4-inch
300 ft
4-inch
150 ft
4-inch
Pump
Tank 2
= 90° Elbow
= Reducer
All piping is
schedule 40 steel
with diameters given.
Figure 8-7 Pipe and Pump Network
Calculate the expected flowrate in gal/min when all frictional losses are cor
Repeat part (a) but only consider the frictional losses in the straight pipe
a. Calculate the expected flow rate in gal/min when all
frictional losses are considered.
b. Repeat part (a) but only consider the frictional
losses in the straight pipes.
c. What is the % error in flow rate for part (b) relative to
part…
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Chapter 18 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 18 - A pipe in a compressed air system is carrying 2650...Ch. 18 - Prob. 18.2PPCh. 18 - Prob. 18.3PPCh. 18 - A duct in a heating system carries 8320 cfm....Ch. 18 - The velocity of flow in a ventilation duct is 1140...Ch. 18 - Prob. 18.6PPCh. 18 - Prob. 18.7PPCh. 18 - Prob. 18.8PPCh. 18 - Prob. 18.9PPCh. 18 - Prob. 18.10PP
Ch. 18 - Prob. 18.11PPCh. 18 - Describe a centrifugal fan with forward-curved...Ch. 18 - Prob. 18.13PPCh. 18 - Prob. 18.14PPCh. 18 - Name four types of positive-displacement...Ch. 18 - Name a type of compressor often used for pneumatic...Ch. 18 - Prob. 18.17PPCh. 18 - Prob. 18.18PPCh. 18 - Prob. 18.19PPCh. 18 - Compute the specific weight of nitrogen at 32...Ch. 18 - Compute the specific weight of air at 1260...Ch. 18 - Prob. 18.22PPCh. 18 - An air compressor delivers 820 cfm of free air....Ch. 18 - Prob. 18.24PPCh. 18 - Prob. 18.25PPCh. 18 - Prob. 18.26PPCh. 18 - Specify a size of Schedule 40 steel pipe suitable...Ch. 18 - For an aeration process, a sewage treatment plant...Ch. 18 - Prob. 18.29PPCh. 18 - Prob. 18.30PPCh. 18 - Prob. 18.31PPCh. 18 - Prob. 18.32PPCh. 18 - Prob. 18.33PPCh. 18 - Prob. 18.34PPCh. 18 - Prob. 18.35PPCh. 18 - Figure 18.14 iD shows a two-compartment vessel....Ch. 18 - Prob. 18.37PPCh. 18 - Prob. 18.38PPCh. 18 - Prob. 18.39PPCh. 18 - A tank of Refrigerant is at 150 kPa gage and 20C....Ch. 18 - Prob. 18.41PP
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