Pipe Friction Loss Charts

PVC SCHEDULE 40 PLASTIC PIPE

C-Factor = 150

Velocities in excess of 5 fps should be avoided.*
PSI LOSS PER 100 FEET OF PIPE

Size

1/2"

3/4"

1"

1 1/4"

1 1/2"

OD

0.840

1.050

1.315

1.660

1.900

ID

0.622

0.824

1.049

1.380

1.610

Wall Thk

0.109

0.113

0.133

0.140

0.145

Flow GPM

Velocity FPS

PSI Loss

Velocity FPS

PSI Loss

Velocity FPS

PSI Loss

Velocity FPS

PSI Loss

Velocity FPS

PSI Loss

1

1.05

0.43

0.60

0.11

0.37

0.03

0.21

0.01

0.16

0.00

2

2.11

1.55

1.20

0.39

0.74

0.12

0.43

0.03

0.31

0.02

3

3.16

3.28

1.80

0.84

1.11

0.26

0.64

0.07

0.47

0.03

4

4.22

5.59

2.40

1.42

1.48

0.44

0.86

0.12

0.63

0.05

5

5.27

8.45

3.00

2.15

1.85

0.66

1.07

0.17

0.79

0.08

6

6.33

11.85

3.61

3.02

2.22

0.93

1.29

0.25

0.94

0.12

7

7.38

15.76

4.21

4.01

2.60

1.24

1.50

0.33

1.10

0.15

8

8.44

20.18

4.81

5.14

2.97

1.59

1.71

0.42

1.26

0.20

9

9.49

25.10

5.41

6.39

3.34

1.97

1.93

0.52

1.42

0.25

10

10.55

30.51

6.01

7.77

3.71

2.40

2.14

0.63

1.57

0.30

11

11.60

36.40

6.61

9.26

4.08

2.86

2.36

0.75

1.73

0.36

12

12.65

42.77

7.21

10.88

4.45

3.36

2.57

0.89

1.89

0.42

14

14.76

56.90

8.41

14.48

5.19

4.47

3.00

1.18

2.20

0.56

16

16.87

72.86

9.61

18.54

5.93

5.73

3.43

1.51

2.52

0.71

18

18.98

90.62

10.82

23.06

6.67

7.12

3.86

1.88

2.83

0.89

20

21.09

110.15

12.02

28.03

7.42

8.66

4.28

2.28

3.15

1.08

22

-

-

13.22

33.44

8.16

10.33

4.71

2.72

3.46

1.28

24

-

-

14.42

39.29

8.90

12.14

5.14

3.20

3.78

1.51

26

-

-

15.62

45.57

9.64

14.08

5.57

3.71

4.09

1.75

28

-

-

16.83

52.27

10.38

16.15

6.00

4.25

4.41

2.01

30

-

-

18.03

59.40

11.12

18.35

6.43

4.83

4.72

2.28

35

-

-

-

-

12.98

24.41

7.50

6.43

5.51

3.04

40

-

-

-

-

14.83

31.26

8.57

8.23

6.30

3.89

45

-

-

-

-

16.68

38.88

9.64

10.24

7.08

4.83

50

-

-

-

-

18.54

47.26

10.71

12.44

7.87

5.88

55

-

-

-

-

-

-

11.78

14.84

8.66

7.01

60

-

-

-

-

-

-

12.85

17.44

9.44

8.24

65

-

-

-

-

-

-

13.93

20.23

10.23

9.55

70

-

-

-

-

-

-

15.00

23.20

11.02

10.96

75

-

-

-

-

-

-

16.07

26.36

11.81

12.45

* Velocities in excess of 5 fps increase the possibility of water hammer and damage to piping. Above areas in red indicate flow and pipe sizing which should be avoided when installing an irrigation system.

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