Efficiency, % 90 80 60 189 L/s (3000 gal/min) 630 L/s (10,000 gal/min) > 630 L/s 63 L/s (1000 gal/min) 31.5 L/s (500 gal/min) 70 2 60 12.5 L/s (200 gal/min) 6.3 L/s (100 gal/min) 50 40 40 500 1,000 10 2,000 5,000 Specific speed, ns (U.S. customary units) 50 Type number, ns (SI units) 10,000 100 200 300 Radial flow Mixed flow Impeller shape Propeller (axial flow) Figure 12.2.5 Pump efficiency as related to specific speed and discharge (from Tchobanoglous (1998)). 12.2.2 A flow of 0.03 m³/s must be pumped against a head of 30 m. The pump will be driven by an electric motor with a speed of 1800 rev/min. What type of pump should be used and what is the corresponding efficiency? и S 1800√0.03 = Q 24.3 3/4 H (304
Efficiency, % 90 80 60 189 L/s (3000 gal/min) 630 L/s (10,000 gal/min) > 630 L/s 63 L/s (1000 gal/min) 31.5 L/s (500 gal/min) 70 2 60 12.5 L/s (200 gal/min) 6.3 L/s (100 gal/min) 50 40 40 500 1,000 10 2,000 5,000 Specific speed, ns (U.S. customary units) 50 Type number, ns (SI units) 10,000 100 200 300 Radial flow Mixed flow Impeller shape Propeller (axial flow) Figure 12.2.5 Pump efficiency as related to specific speed and discharge (from Tchobanoglous (1998)). 12.2.2 A flow of 0.03 m³/s must be pumped against a head of 30 m. The pump will be driven by an electric motor with a speed of 1800 rev/min. What type of pump should be used and what is the corresponding efficiency? и S 1800√0.03 = Q 24.3 3/4 H (304
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
I have gotten this far, but I am not sure how to read the graph to find effieciency. Please see attached.
Transcribed Image Text:Efficiency, %
90
80
60
189 L/s (3000 gal/min)
630 L/s (10,000 gal/min)
> 630 L/s
63 L/s (1000 gal/min)
31.5 L/s (500 gal/min)
70
2
60
12.5 L/s (200 gal/min)
6.3 L/s (100 gal/min)
50
40
40
500
1,000
10
2,000
5,000
Specific speed, ns (U.S. customary units)
50
Type number, ns (SI units)
10,000
100
200
300
Radial flow
Mixed flow
Impeller shape
Propeller
(axial flow)
Figure 12.2.5 Pump efficiency as related to specific speed and discharge (from Tchobanoglous (1998)).
Transcribed Image Text:12.2.2 A flow of 0.03 m³/s must be pumped against a head of 30 m.
The pump will be driven by an electric motor with a speed of 1800
rev/min. What type of pump should be used and what is the
corresponding efficiency?
и
S
1800√0.03
=
Q
24.3
3/4
H
(304
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