Pump Handbook

Friction Loss for Water

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U.S Gallons per minute

1/8 In. (0.269" I.D.)

1/4 In. (0.364" I.D.)

3/8 In. (0.493" I.D.)

1/2 In. (0.622" I.D.)

U.S Gallons per minute

V (Ft/Sec)

V2/2g

hf (Ft/100 ft)

V

V2/2g

hf

V

V2/2g

hf

V

V2/2g

hf

0.2

1.13

0.020

2.72

                 

0.2

0.4

2.26

0.079

16.2

1.23

0.024

3.7

           

0.4

0.6

3.39

0.178

33.8

1.85

0.053

7.6

1.01

0.016

1.74

     

0.6

0.8

4.52

0.317

57.4

2.47

0.095

12.7

1.34

0.028

2.89

     

0.8

1.0

5.65

0.495

87.0

3.08

0.148

19.1

1.68

0.044

4.3

1.06

0.017

1.86

1.0

1.5

8.48

1.12

188

4.62

0.332

40.1

2.52

0.099

8.93

1.58

0.039

2.85

1.5

2.0

11.3

1.98

324

6.17

0.591

69

3.36

0.176

15.0

2.11

0.069

4.78

2.0

2.5

     

7.71

0.923

105

4.2

0.274

22.6

2.64

0.108

7.16

2.5

3.0

     

9.25

1.33

148

5.04

0.395

31.8

3.17

0.156

10

3.0

3.5

     

10.79

1.81

200

5.88

0.538

42.6

3.70

0.212

13.3

3.5

4.0

     

12.33

2.36

259

6.72

0.702

54.9

4.22

0.277

17.1

4.0

4.5

     

13.87

2.99

326

7.56

0.889

68.4

4.75

0.351

21.3

4.5

5

     

15.42

3.69

398

8.4

1.1

83.5

5.28

0.433

25.8

5

6

           

10.1

1.58

118

6.34

0.624

36.5

6

7

           

11.8

2.15

158

7.39

0.849

48.7

7

8

           

13.4

2.81

205

8.45

1.11

62.7

8

9

           

15.1

3.56

258

9.5

1.40

78.3

9

10

           

16.8

4.39

316

10.6

1.73

95.9

10

12

                 

12.7

2.49

136

12

14

                 

14.8

3.40

183

14

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