50 n = 1170 r/min 800 40 NPSH 30 700 * 364-in dia. 20 = 600 32-in dia. 500 2500 bhp 400 28-in dia. 1500 bhp 300 200 20 24 28 12 16 U.S. gallons per minute x 1000 NPSH, ft %78 72% %L8 %88 859 3500 bhp 3000 bhp Total head, ft 2000 bhp

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Question

Two 32-in pumps from Fig.  are to be used in series
at 1170 r/min to lift water through 500 ft of vertical cast
iron pipe. What should the pipe diameter be for most effi -
cient operation? Neglect minor losses.

50
n = 1170 r/min
800
40
NPSH
30
700
* 364-in dia.
20
= 600
32-in dia.
500
2500 bhp
400
28-in dia.
1500 bhp
300
200
20
24
28
12
16
U.S. gallons per minute x 1000
NPSH, ft
%78
72%
%L8
%88
859
3500 bhp
3000 bhp
Total head, ft
2000 bhp
Transcribed Image Text:50 n = 1170 r/min 800 40 NPSH 30 700 * 364-in dia. 20 = 600 32-in dia. 500 2500 bhp 400 28-in dia. 1500 bhp 300 200 20 24 28 12 16 U.S. gallons per minute x 1000 NPSH, ft %78 72% %L8 %88 859 3500 bhp 3000 bhp Total head, ft 2000 bhp
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