Friction Loss

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HorsePower Friction Loss Dynamic Head Calc

FRICTION LOSS CHART

Friction Loss Per 100 Feet of Pipe of plastic pipe

PIPE DIAMETER
 

1/2 in.

3/4 in.

1 in.

1 1/4 in.

1 1/2 in.

2 in.

2 1/2 in.

3 in.

4 in.

5 in.

GPM

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

1

2.08

4.02

0.51

0.86

                                

2

4.16

8.03

1.02

1.72

0.55

0.88

0.14

0.21

0.07

0.10

                    

5

23.44

45.23

5.73

9.67

1.72

2.75

0.44

0.66

0.22

0.30

0.066

0.10

0.038

0.05

0.015

0.02

        

7

43.06

83.07

10.52

17.76

3.17

5.04

0.81

1.21

0.38

0.55

0.11

0.15

0.051

0.07

0.021

0.028

        

10

82.02

-

20.04

33.84

6.02

9.61

1.55

2.30

0.72

1.04

0.21

0.29

0.09

0.12

0.03

0.04

        

15

-

-

42.46

71.70

12.77

20.36

3.28

4.87

1.53

2.20

0.45

0.62

0.19

0.26

0.07

0.09

        

20

-

-

72.34

-

21.75

34.68

5.59

8.30

2.61

3.75

0.76

1.06

0.32

0.44

0.11

0.15

0.03

0.04

    

25

-

-

-

-

32.88

52.43

8.45

12.55

3.95

5.67

1.15

1.60

0.49

0.67

0.17

0.22

0.04

0.06

    

30

-

-

-

-

46.08

73.48

11.85

17.59

5.53

7.95

1.62

2.25

0.68

0.94

0.23

0.31

0.06

0.08

0.02

0.03

35

-

-

-

-

-

-

15.76

23.40

7.36

10.58

2.15

2.99

0.91

1.25

0.31

0.42

0.08

0.11

0.03

0.04

40

-

-

-

-

-

-

20.18

29.97

9.43

13.55

2.75

3.83

1.16

1.60

0.40

0.54

0.11

0.14

0.03

0.04

45

-

-

-

-

-

-

25.10

37.27

11.73

16.85

3.43

4.76

1.44

1.99

0.50

0.67

0.13

0.17

0.04

0.06

50

-

-

-

-

-

-

30.51

45.30

14.25

20.48

4.16

5.79

1.75

2.42

0.60

0.81

0.16

0.21

0.05

0.07

60

-

-

-

-

-

-

-

-

19.98

28.70

5.84

8.12

2.46

3.39

0.85

1.14

0.22

0.30

0.07

0.10

70

-

-

-

-

-

-

-

-

-

-

7.76

10.80

3.27

4.51

1.13

1.51

0.30

0.39

0.10

0.13

75

-

-

-

-

-

-

-

-

-

-

8.82

12.27

3.71

5.12

1.28

1.72

0.34

0.45

0.11

0.14

80

-

-

-

-

-

-

-

-

-

-

9.94

13.83

4.19

5.77

1.44

1.94

0.38

0.50

0.13

0.16

90

-

-

-

-

-

-

-

-

-

-

12.37

17.20

5.21

7.18

1.80

2.41

0.47

0.63

0.16

0.20

100

-

-

-

-

-

-

-

-

-

-

15.03

20.90

6.33

8.72

2.18

2.93

0.58

0.76

0.19

0.24

125

-

-

-

-

-

-

-

-

-

-

-

-

9.58

13.21

3.31

4.43

0.88

1.16

0.29

0.37

150

-

-

-

-

-

-

-

-

-

-

-

-

13.41

18.48

4.63

6.20

1.22

1.61

0.40

0.52

175

-

-

-

-

-

-

-

-

-

-

-

-

-

-

6.16

8.26

1.63

2.15

0.54

0.69

200

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7.88

10.57

2.08

2.75

0.69

0.88

250

-

-

-

-

-

-

-

-

-

-

-

-

-

-

11.93

16.00

3.15

4.16

1.05

1.34

300

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

4.41

5.83

1.46

1.87

350

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

5.87

7.76

1.95

2.49

400

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

7.52

9.93

2.49

3.19

450

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

3.09

3.97

500

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

3.76

4.82

THIS CHART GIVES FRICTION LOSSES FOR YOUR GIVEN FLOW RATE PER 100 FEET OF PIPE. EXAMPLE: IF YOU HAVE 60 GALLONS PER MINUTE AND YOU'RE USING 2 INCH SCHEDULE 80 PIPE AND YOU HAVE A 160 FEET OF PIPE, YOUR FRICTION LOSS IS 8.12 x 1.6 = 12.99 FEET.

NOTE: IT IS BEST TO KEEP YOUR FRICTION LOSS (PER 100 FEET OF PIPE) TO LESS THAN 5 FEET.

FRICTION LOSS IN PVC FITTINGS IN EQUIVALENT FEET OF STRAIGHT PIPE

NORMAL PIPE SIZE (IN)

1/2"

3/4"

1"

1 1/4"

1 1/2"

2"

2 1/2"

3"

4"

90° ELBOW, STANDARD

1.5

2.0

2.25

4.0

4.0

6.0

8.0

8.0

12.0

45° ELBOW, STANDARD

0.75

1.0

1.4

1.75

2.0

2.5

3.0

4.0

5.0

INSERT COUPLING

0.5

0.75

1.0

1.25

1.5

2.0

3.0

3.0

4.0

GATE VALVE

.3

.4

.6

.8

1.0

1.5

1.6

2.0

3.0

MALE-FEMALE ADAPTERS

1.0

1.5

2.0

2.75

3.5

4.5

-

6.5

9.0

TEE - FLOW through RUN

1.0

1.4

1.7

2.3

2.7

4.3

5.1

6.3

8.3

TEE - FLOW THROUGH BRANCH

4.0

5.0

6.0

7.0

8.0

12.0

15.0

16.0

22.0

 

 

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