Shown in the Figure is the complete pump performance chart for a 3x4-10 centrifugal pump at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head of 50 ft. (4) What is the efficiency for the selected impeller? Impeller diameter 10 in Total head (m) NPSH, (m) 30 25 20 15 10 Total head (ft) Op 'HSIN 110 100 90 80 8 8 708 in 60 5 8 8 8 8 8 50 30 9 in 406 in 20 7 in 10 43... 200 53 O A approximate 69% B. approximate 62% O C. below 53% O D. approximate 67% 1.5 HP 400 65 69 Impeller 6 in 600 = 53 3 HP 7 in 73.9 SHP 2 HP 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 10.01 7.5 5.0 2.5 800 Capacity (L/min) 73 72 63 71 7.5 HP 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 Capacity (gal/min) in 3x4-10 1750 RPM 1200 1400 69 10 HP 10 in 1600

Elements Of Electromagnetics
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  1. Shown in the Figure is the complete pump performance chart for a  3×4-10 centrifugal pump at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head of 50 ft. 

    (4)  What is the efficiency for the selected impeller? _________

     

      A.

    approximate 69%

      B.

    approximate 62%

      C.

    below 53%

      D.

    approximate 67%

Shown in the Figure is the complete pump performance chart for a 3x4-10 centrifugal pump
at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head
of 50 ft.
(4) What is the efficiency for the selected impeller?
Impeller diameter
10 in
Total head (m)
(w) HIN
35
30
25
20
15
10
110
100
909 in
Total head (ft)
88888:
NPSH, (f)
80
708 in
60
50
406 in
30
20
10
0
10.0
7.5
5.0
2.5
7 in
0
25
43 53
43
200
-61-
1.5 HP
O A approximate 69%
O B. approximate 62%
O C. below 53%
O D. approximate 67%
400
65
Impeller
69
600
71 72 73 73.9
6 in
53
3 HP
7 in
-2 HP
50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425
SHP
800
Capacity (L/min)
1000
8 in
73
72
1200
0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425
Capacity (gal/min)
71
7.5 HP
9 in
3x4-10
1750 RPM
1400
69
10 HP
10 in
1600
Transcribed Image Text:Shown in the Figure is the complete pump performance chart for a 3x4-10 centrifugal pump at 1750 rpm. The centrifugal pump must deliver at least 200 gal/min of water at the total head of 50 ft. (4) What is the efficiency for the selected impeller? Impeller diameter 10 in Total head (m) (w) HIN 35 30 25 20 15 10 110 100 909 in Total head (ft) 88888: NPSH, (f) 80 708 in 60 50 406 in 30 20 10 0 10.0 7.5 5.0 2.5 7 in 0 25 43 53 43 200 -61- 1.5 HP O A approximate 69% O B. approximate 62% O C. below 53% O D. approximate 67% 400 65 Impeller 69 600 71 72 73 73.9 6 in 53 3 HP 7 in -2 HP 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 SHP 800 Capacity (L/min) 1000 8 in 73 72 1200 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 Capacity (gal/min) 71 7.5 HP 9 in 3x4-10 1750 RPM 1400 69 10 HP 10 in 1600
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