Application – All Motors

2.Determine pump horsepower required from the pump manufacturer’s curve.

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXAMPLE

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horsepower

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Brake

3

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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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Page 11
Image 11
Franklin 2007 manual Hot Water Applications Example, Heat Factor Multiplier at 3 ft/s .91 m/sec Flow Rate, KW Sfhp