Franklin 2007 manual Hot Water Applications Example, Service Factor Horsepower, KW Sfhp

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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