The 36¾ -in pump of the figure below is to pump 20,000 gpm of water at 1,170 rpm from a reservoir whose surface is at atmospheric pressure (i.e. 14.7 psia). a) If head loss from the reservoir to the pump inlet is 6 ft, where should the pump inlet be placed to avoid cavitation for water. The vapor pressure of water at 60°F is 0.26 psi. b) Determine the required brake horsepower. c) The water is to be transported in an 80 cm pipe, and the engineer would like to measure the flow rate downstream of the pump using an orifice meter. What should be the orifice meter diameter if the pressure differential across it, is to be fixed at 1 m of mercury (density = 13,600 kg/m³).

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter40: Typical Operating Conditions
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The 36% -in pump of the figure below is to pump 20,000 gpm of water at 1,170 rpm from a reservoir whose
surface is at atmospheric pressure (i.e. 14.7 psia).
a) If head loss from the reservoir to the pump inlet is 6 ft, where should the pump inlet be placed to
avoid cavitation for water. The vapor pressure of water at 60°F is 0.26 psi.
b) Determine the required brake horsepower.
pressure differential across it, is to be fixed at 1 m of mercury (density = 13,600 kg/m³).
50
c) The water is to be transported in an 80 cm pipe, and the engineer would like to measure the flow rate
downstream of the pump using an orifice meter. What should be the orifice meter diameter if the
40
n = 1170 r/min
30
NPSH
|20
700 - 362 in dia..
600
32 in dia.
500
3500 bhp
3000 bhp
2500 bhp.
400
28 in dia."
2000 bhp
1500 bhp
300
20
24
28
16
8 12
US gallons per minute x 1000
200
(From Ingersoll-Rand Corporation, Cameron Pump Division)
Total head, ft
%88
%Z8-
%8L
NPSH, ft
Transcribed Image Text:The 36% -in pump of the figure below is to pump 20,000 gpm of water at 1,170 rpm from a reservoir whose surface is at atmospheric pressure (i.e. 14.7 psia). a) If head loss from the reservoir to the pump inlet is 6 ft, where should the pump inlet be placed to avoid cavitation for water. The vapor pressure of water at 60°F is 0.26 psi. b) Determine the required brake horsepower. pressure differential across it, is to be fixed at 1 m of mercury (density = 13,600 kg/m³). 50 c) The water is to be transported in an 80 cm pipe, and the engineer would like to measure the flow rate downstream of the pump using an orifice meter. What should be the orifice meter diameter if the 40 n = 1170 r/min 30 NPSH |20 700 - 362 in dia.. 600 32 in dia. 500 3500 bhp 3000 bhp 2500 bhp. 400 28 in dia." 2000 bhp 1500 bhp 300 20 24 28 16 8 12 US gallons per minute x 1000 200 (From Ingersoll-Rand Corporation, Cameron Pump Division) Total head, ft %88 %Z8- %8L NPSH, ft
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