Answered: A centrifugal pump has a…

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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Question

A centrifugal pump has a 41.5-in-diameter impeller. It is used to deliver water at about 12,000 gal/min. Its pump performance curve when spun at 710 RPM is shown in the figure below. If the impeller is trimmed to a new diameter of 39.5in, estimate the new head (in feet) and flow (in gal/min or GPM) if the speed is not changed.

a. 11244 gpm, 283 ft

b. 11422 gpm, 283 ft

c. 11422 gpm, 238 ft

n = 710 r/min
400
NPSH
25
350
41-in dia.
20
15
300
10
38-in dia.
250
35-in dia.
86%
200
84%
150
100
4
8
12
16
20
24
U.S. gallons per minute x 1000
28
NPSH, ft
%88
%98.
88%-
1500 bhp
1250 bhp
1000 bhp
%09
Total head, ft

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