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Friction Loss Chart

Friction Loss Per 100 Feet of Pipe of plastic pipe (Schedule 40 pipe is white and schedule 80 pipe is gray).
Pipe Diameter 1 in. 1 1/2 in. 2 in. 2 1/2 in. 3 in. 4 in
USgph

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80

SCH

40

SCH

80
120 0.55 0.88 0.07 0.10 - - - - - - - -
300 1.72 2.75 0.22 0.30 0.066 0.10 0.038 0.05 0.015 0.02 - -
420 3.17 5.04 0.38 0.55 0.11 0.15 0.051 0.07 0.021 0.028 - -
600 6.02 9.61 0.72 1.04 0.21 0.29 0.09 0.12 0.03 0.04 - -
900 12.77 20.36 1.53 2.20 0.45 0.62 0.19 0.26 0.07 0.09 - -
1200 21.75 34.68 2.61 3.75 0.76 1.06 0.32 0.44 0.11 0.15 0.03 0.04
1500 32.88 52.43 3.95 5.67 1.15 1.60 0.49 0.67 0.17 0.22 0.04 0.06
1800 46.08 73.48 5.53 7.95 1.62 2.25 0.68 0.94 0.23 0.31 0.06 0.08
2100 - - 7.36 10.58 2.15 2.99 0.91 1.25 0.31 0.42 0.08 0.11
2400 - - 9.43 13.55 2.75 3.83 1.16 1.60 0.40 0.54 0.11 0.14
2700 - - 11.73 16.85 3.43 4.76 1.44 1.99 0.50 0.67 0.13 0.17
3000 - - 14.25 20.48 4.16 5.79 1.75 2.42 0.60 0.81 0.16 0.21
3600 - - 19.98 28.70 5.84 8.12 2.46 3.39 0.85 1.14 0.22 0.30
4200 - - - - 7.76 10.80 3.27 4.51 1.13 1.51 0.30 0.39
4500 - - - - 8.82 12.27 3.71 5.12 1.28 1.72 0.34 0.45
4800 - - - - 9.94 13.83 4.19 5.77 1.44 1.94 0.38 0.50
5400 - - - - 12.37 17.20 5.21 7.18 1.80 2.41 0.47 0.63
6000 - - - - 15.03 20.90 6.33 8.72 2.18 2.93 0.58 0.76
7500 - - - - - - 9.58 13.21 3.31 4.43 0.88 1.16
9000 - - - - - - 13.41 18.48 4.63 6.20 1.22 1.61
10500 - - - - - - - - 6.16 8.26 1.63 2.15
12000 - - - - - - - - 7.88 10.57 2.08 2.75
15000 - - - - - - - - 11.93 16.00 3.15 4.16
18000 - - - - - - - - - - 4.41 5.83
21000 - - - - - - - - - - 5.87 7.76
24000 - - - - - - - - - - 7.52 9.93

Friction loss in PVC fittings in equivalent feet of straight pipe

This chart gives friction losses for your given flow rate per 100 feet of pipe. Example: If you have 3600 gallons per hour and you're using 2 inch schedule 40 pipe and you have a 160 feet of pipe, your friction loss is 5.84 x 1.6 = 9.34 feet.

Note: It is best to keep your friction loss (per 100 feet of pipe) to less than five feet.

NORMAL PIPE SIZE (IN)

1"

1 1/2"

2"

2 1/2"

3"

4"
90° ELBOW, STANDARD

2.25

4.0

6.0

8.0

8.0

12.0
45° ELBOW, STANDARD

1.4

2.0

2.5

3.0

4.0

5.0
INSERT COUPLING

1.0

1.5

2.0

3.0

3.0

4.0
GATE VALUE

.6

1.0

1.5

1.6

2.0

3.0
MALE-FEMALE ADAPTERS

2.0

3.5

4.5

-

6.5

9.0
TEE - FLOW through RUN

1.7

2.7

4.3

5.1

6.3

8.3
TEE - FLOW THROUGH BRANCH

6.0

8.0

12.0

15.0

16.0

22.0

 

 

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