Friction Loss Charts - Per 100’ of Pipe

GPM

Size

Plastic

Pipe

GPM

5

10

15

20

25

30

35

40

45

50

75

100

125

150

200

1/2”

24

-

-

-

-

-

-

-

-

-

-

-

-

-

-

3/4”

5

19

30

-

-

-

-

-

-

-

-

-

-

-

-

1”

1.5

5

10

17

26

-

-

-

-

-

-

-

-

-

-

1 1/4”

0.5

1.5

3.5

5.5

8

11

14

18

21

25

-

-

-

-

-

1 1/2”

-

1

1.5

2.5

4

5.5

7

8.5

10.5

13

27

-

-

-

-

2”

-

-

-

1

1.5

2

2.5

3

3.5

4

8

15

22

30

-

3”

-

-

-

-

-

-

-

-

-

1

1.5

2

3.5

5

8

4”

-

-

-

-

-

-

-

-

-

-

-

-

-

-

2

This chart gives friction losses for your given flow rate per 100 feet of pipe.  Example: if you have a 45 GPM flow rate and you are using 2” pipe, and you are running 75 feet, your friction losses will be 3.5 X 0.75 = 2.625 feet.  Note:  It is best to keep total friction losses less that 6 feet per 100’

Normal Pipe Size

1/2”

3/4”

1”

1 1/4”

1 1/2”

2”

3”

4”

90 Elbow - Standard

1.5

2.0

2.25

4.0

4.0

6.0

8.0

12.0

45 Elbow, Standard

0.75

1.0

1.4

1.75

2.0

2.5

4.0

5.0

Insert Coupling

0.5

0.75

1.0

1.25

1.5

2.0

3.0

4.0

Gate Valve

0.3

0.4

0.6

0.8

1.0

1.5

2.0

3.0

Male-Female Adaptors

1.0

1.5

2.0

2.75

3.5

4.5

6.5

9.0

Tee-Flow thru Run

1.0

1.4

1.7

2.3

2.7

4.3

6.3

8.3

Tee-Flow thru Branch

4.0

5.0

6.0

7.0

8.0

12.0

16.0

22.0