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Application – All Motors
2.Determine pump horsepower required from the pump manufacturer’s curve.
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| EXAMPLE |
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Horsepower | 5 |
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Brake | 3 |
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| 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 |
Gallons Per Minute
FIG. 2 MANUFACTURER’S PUMP CURVE
Table 8 Heat Factor Multiplier at 3 ft/s (.91 m/sec) Flow Rate
3.Multiply the pump horsepower required by the heat factor multiplier from table 8.
MAXIMUM
WATER TEMPERATURE
140 °F (60 °C)
131 °F (55 °C)
122 °F (50 °C)
113 °F (45 °C)
104 °F (40 °C)
95 °F (35 °C)
1/3 - 5 HP
.25 - 3.7 KW
1.25
1.11
1.00
1.00
1.00
1.00
7 1/2 - 30 HP
5.5- 22 KW
1.62
1.32
1.14
1.00
1.00
1.00
OVER 30 HP OVER 22 KW
2.00
1.62
1.32
1.14
1.00
1.00
Table 8A Service Factor Horsepower
4.Select a rated hp motor on table 8A whose Service Factor Horsepower is at least the value calculated in Item 3.
HP
1/3
1/2
3/4
1
1.5
2
KW SFHP
0.250.58
0.370.80
0.551.12
0.751.40
1.101.95
1.502.50
HP | KW | SFHP |
| HP | KW | SFHP |
| HP | KW | SFHP |
3 | 2.2 | 3.45 |
| 25 | 18.5 | 28.75 |
| 100 | 75 | 115.00 |
5 | 3.7 | 5.75 |
| 30 | 22.0 | 34.50 |
| 125 | 90 | 143.75 |
7.5 | 5.5 | 8.62 |
| 40 | 30.0 | 46.00 |
| 150 | 110 | 172.50 |
10 | 7.5 | 11.50 |
| 50 | 37.0 | 57.50 |
| 175 | 130 | 201.25 |
15 | 11.0 | 17.25 |
| 60 | 45.0 | 69.00 |
| 200 | 150 | 230.00 |
20 | 15.0 | 23.00 |
| 75 | 55.0 | 86.25 |
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Hot Water Applications - Example
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
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.
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