a) Develop an equation for the head (in ft) developed by the pump described by the chart as a function of flow rate (in gpm) when the pump uses a 9 ¾” impeller. b) Develop an equation for the pump efficiency as a function of flow rate (gpm) when the pump uses a 9 ¾” impeller.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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a) Develop an equation for the head (in ft) developed by the pump described by the chart
as a function of flow rate (in gpm) when the pump uses a 9 ¾” impeller. 
b) Develop an equation for the pump efficiency as a function of flow rate (gpm) when the pump 
uses a 9 ¾” impeller.  

TOTAL HEAD IN METERS
30
25
20
15
H▬▬▬▬▬▬▬▬▬
10
TOTAL HEAD IN FEET
100
90
80
70
60
50
40
30
20
10
0
0
0
FOR 5x5x9%B CENTRIFUGAL PUMP FIG. NO. VSC
CURVES BASED ON SHOP TEST USING CLEAR COLD WATER AT A TEMPERATURE OF NOT
OVER 85°F. PERFORMANCE IS GUARANTEED AT INDICATED OPERATING POINT ONLY.
-9%"-
-8%"
7%"
6%"
5%"
-40%-50% -60%
JA
Impellers are trimmed in % incre-
ments to supply required capacity.
Responsibility for final impeller siz-
ing remains with ITT Bell & Gossett
LI 1 LLLLL
100
200
PERFORMANCE CHARACTERISTIC CURVE
50
70%
-75%
3HP
-78%-
APPROVED R.2
79.5%
100
CAPACITY IN CUBIC METERS/HR
5HP
NPSH REQUIRED
3000 400
500
600
CAPACITY IN U.S. GALLONS PER MINUTE
150
SPEED
7½HP
700
1750 R.P.M.
DATE 10-8-80
5x5x9³34B
1750 R.P.M.
78%
10HP
800
75%
-70%
-15HP
900
200
60%
-20HP-
NPSH FEET
40
30
20
10
0
1000
NPSH METERS
10
-5
Transcribed Image Text:TOTAL HEAD IN METERS 30 25 20 15 H▬▬▬▬▬▬▬▬▬ 10 TOTAL HEAD IN FEET 100 90 80 70 60 50 40 30 20 10 0 0 0 FOR 5x5x9%B CENTRIFUGAL PUMP FIG. NO. VSC CURVES BASED ON SHOP TEST USING CLEAR COLD WATER AT A TEMPERATURE OF NOT OVER 85°F. PERFORMANCE IS GUARANTEED AT INDICATED OPERATING POINT ONLY. -9%"- -8%" 7%" 6%" 5%" -40%-50% -60% JA Impellers are trimmed in % incre- ments to supply required capacity. Responsibility for final impeller siz- ing remains with ITT Bell & Gossett LI 1 LLLLL 100 200 PERFORMANCE CHARACTERISTIC CURVE 50 70% -75% 3HP -78%- APPROVED R.2 79.5% 100 CAPACITY IN CUBIC METERS/HR 5HP NPSH REQUIRED 3000 400 500 600 CAPACITY IN U.S. GALLONS PER MINUTE 150 SPEED 7½HP 700 1750 R.P.M. DATE 10-8-80 5x5x9³34B 1750 R.P.M. 78% 10HP 800 75% -70% -15HP 900 200 60% -20HP- NPSH FEET 40 30 20 10 0 1000 NPSH METERS 10 -5
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