Answered: Two 35-inch pumps from the figure (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

Two 35-inch pumps from the figure (a) shown below are installed in parallel for the system of the figure (b) shown below. Neglect minor losses. For water at 20°C, take ρ = 1.94 slug/ft³ and μ = 2.09E−5 slug/ft⋅s. For cast iron, ε ≈ 0.00085 ft.

1) Estimate the flow rate and power required if both the pumps are running.

Q = ? in gal/min

P = ? bhp

2) Estimate the flow rate and power required if one pump is shutoff and isolated.

Q = ? in gal/min

P = ? bhp

1 statute mile
of cast iron pipe,
Two pumps
figure (b)

n = 710 r/min
400
NPSH
25
350 – 413-in dia.
300
10
38-in dia.
250 – 35-in dia.
86%.
200
84%
150
100
4
8
12
16
20
24
28
U.S. gallons per minute x 1000
(b)
NPSH, ft
%88•
1500 bhp
1250 bhp
%88
%98.
1000 bhp
84%
%08
Total head, ft

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