Two 32-in pumps from Fig. are to be used in seriesat 1170 r/min to lift water through 500 ft of vertical castiron pipe. What should the pipe diameter be for most effi -cient operation? Neglect minor losses. 50n = 1170 r/min80040NPSH30700* 364-in dia.20= 60032-in dia.5002500 bhp40028-in dia.1500 bhp3002002024281216U.S. gallons per minute x 1000NPSH, ft%7872%%L8%888593500 bhp3000 bhpTotal head, ft2000 bhp

Reynold's number Re = 4 ρ Q / π µ d Q = 44.56 ft3 / s d = 16 ft µ = 0.0000209 slug / ft-sec Re = 4 *…

Answered: 50 n = 1170 r/min 800 40 NPSH 30 700 *…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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

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