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Application – All Motors
EXAMPLE: A 6" pump end requiring 39 hp input will
pump 124 °F water in an 8" well at a delivery rate of 140
gpm. From table 7A, a 6" fl ow sleeve will be required to
increase the fl ow rate to at least 3 ft/s
Using table 8, the 1.62 heat factor multiplier is selected
because the hp required is over 30 hp and water
3. Multiply the pump horsepower required by
the heat factor multiplier from table 8.
4. Select a rated hp motor on table 8A whose
Service Factor Horsepower is at least the
value calculated in Item 3.
Hot Water Applications - Example
temperature is above 122 °F. Multiply 39 hp x 1.62
(multiplier), which equals 63.2 hp. This is the minimum
rated service factor horsepower usable at 39 hp in 124 °F.
Using table 8A, select a motor with a rated service factor
horsepower above 63.2 hp. A 60 hp motor has a service
factor horsepower of 69, so a 60 hp motor may be used.
Table 8 Heat Factor Multiplier at 3 ft/s (.91 m/sec) Flow Rate
Table 8A Service Factor Horsepower
2. Determine pump horsepower required
from the pump manufacturer’s curve.
FIG. 2 MANUFACTURER’S PUMP CURVE
0
0 5 10 15 20 25 30 35 40 45 50
Gallons Per Minute
Brake Horsepower
1
2
3
4
5
6
A
B
C
EXAMPLE
MAXIMUM
WATER TEMPERATURE
1/3 - 5 HP
.25 - 3.7 KW
7 1/2 - 30 HP
5.5 - 22 KW
OVER 30 HP
OVER 22 KW
140 °F (60 °C) 1.25 1.62 2.00
131 °F (55 °C) 1.11 1.32 1.62
122 °F (50 °C) 1.00 1.14 1.32
113 °F (45 °C) 1.00 1.00 1.14
104 °F (40 °C) 1.00 1.00 1.00
95 °F (35 °C) 1.00 1.00 1.00
HP KW SFHP HP KW SFHP HP KW SFHP HP KW SFHP
1/3 0.25 0.58 3 2.2 3.45 25 18.5 28.75 100 75 115.00
1/2 0.37 0.80 5 3.7 5.75 30 22.0 34.50 125 90 143.75
3/4 0.55 1.12 7.5 5.5 8.62 40 30.0 46.00 150 110 172.50
1 0.75 1.40 10 7.5 11.50 50 37.0 57.50 175 130 201.25
1.5 1.10 1.95 15 11.0 17.25 60 45.0 69.00 200 150 230.00
2 1.50 2.50 20 15.0 23.00 75 55.0 86.25
8