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Friction Loss Flow Chart

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Friction Loss per 100 feet of Plastic Pipe

Example of how to use:
1" pipe, with 5 gpm would lose 1.7 feet of head per hundred feet.
To calculate psi, multiply feet of head x .4335

G
P
M 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.

1 2.08 0.51

2 4.16 1.02 0.55 0.14 0.07

5 23.44 5.73 1.72 0.44 0.22 0.066 0.038 0.015

7 43.06 10.52 3.17 0.81 0.38 0.11 0.051 0.021

10 82.02 20.04 6.02 1.55 0.72 0.21 0.09 0.03

15 42.46 12.77 3.28 1.53 0.45 0.19 0.07

20 72.34 21.75 5.59 2.61 0.76 0.32 0.11 0.03

25 32.88 8.45 3.95 1.15 0.49 0.17 0.04

30 46.08 11.85 5.53 1.62 0.68 0.23 0.06 0.02

35 15.76 7.36 2.15 0.91 0.31 0.08 0.03

40 20.18 9.43 2.75 1.16 0.40 0.11 0.03

45 25.10 11.73 3.43 1.44 0.50 0.13 0.04

50 30.51 14.25 4.16 1.75 0.60 0.16 0.05

60 19.98 5.84 2.46 0.85 0.22 0.07

70 7.76 3.27 1.13 0.30 0.10

75 8.82 3.71 1.28 0.34 0.11

80 9.94 4.19 1.44 0.38 0.13

90 12.37 5.21 1.80 0.47 0.16

100 15.03 6.33 2.18 0.58 0.19

125 9.58 3.31 0.88 0.29

150 13.41 4.63 1.22 0.40

175 6.16 1.63 0.54

200 7.88 2.08 0.69

250 11.93 3.15 1.05

300 4.41 1.46

350 5.87 1.95

400 7.52 2.49

450 3.09

500 3.76

Friction Loss in PVC Fittings
The follow table lists friction loss in PVC pipefittings as a measure
of the amount of friction in an equivalent length (ft) of straight pipe.

PVC
Part 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 Value 0.3 0.4 0.6 0.8 1.0 1.5 1.6 2.0 3.0

Male-Female Adapter 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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G P M	Pipe Diameter
G P M	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.
1	2.08	0.51
2	4.16	1.02	0.55	0.14	0.07
5	23.44	5.73	1.72	0.44	0.22	0.066	0.038	0.015
7	43.06	10.52	3.17	0.81	0.38	0.11	0.051	0.021
10	82.02	20.04	6.02	1.55	0.72	0.21	0.09	0.03
15		42.46	12.77	3.28	1.53	0.45	0.19	0.07
20		72.34	21.75	5.59	2.61	0.76	0.32	0.11	0.03
25			32.88	8.45	3.95	1.15	0.49	0.17	0.04
30			46.08	11.85	5.53	1.62	0.68	0.23	0.06	0.02
35				15.76	7.36	2.15	0.91	0.31	0.08	0.03
40				20.18	9.43	2.75	1.16	0.40	0.11	0.03
45				25.10	11.73	3.43	1.44	0.50	0.13	0.04
50				30.51	14.25	4.16	1.75	0.60	0.16	0.05
60					19.98	5.84	2.46	0.85	0.22	0.07
70						7.76	3.27	1.13	0.30	0.10
75						8.82	3.71	1.28	0.34	0.11
80						9.94	4.19	1.44	0.38	0.13
90						12.37	5.21	1.80	0.47	0.16
100						15.03	6.33	2.18	0.58	0.19
125							9.58	3.31	0.88	0.29
150							13.41	4.63	1.22	0.40
175								6.16	1.63	0.54
200								7.88	2.08	0.69
250								11.93	3.15	1.05
300									4.41	1.46
350									5.87	1.95
400									7.52	2.49
450										3.09
500										3.76

PVC Part	Normal Pipe Size (in)
PVC Part	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 Value	0.3	0.4	0.6	0.8	1.0	1.5	1.6	2.0	3.0
Male-Female Adapter	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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