Friction Loss Flow Chart from the Plumbing Store

Friction Loss Flow Chart

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Feet Of Head Pressure Loss Per 100 Ft. of Plastic Pipe

GPM Pipe Diameter
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4" 5"
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
Example Use: 1" pipe, with 5 GPM would lose 1.72 feet of head pressure per hundred feet

Friction Loss in PVC Fittings = EQUIVALENT FEET OF STRAIGHT PIPE

PVC
Type Pipe Size
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
90° elbow 1.5 2.0 2.25 4.0 4.0 6.0 8.0 8.0 12.0
45° elbow 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 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 5.5 6.5 9.5
tee-flow (run) 1.0 1.4 1.7 2.3 2.7 4.3 5.1 6.3 8.3
tee-flow (branch) 4.0 5.0 6.0 7.0 8.0 12.0 15.0 16.0 22.0

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GPM	Pipe Diameter
GPM	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	4"	5"
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
Example Use: 1" pipe, with 5 GPM would lose 1.72 feet of head pressure per hundred feet

PVC Type	Pipe Size
PVC Type	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	4"
90° elbow	1.5	2.0	2.25	4.0	4.0	6.0	8.0	8.0	12.0
45° elbow	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	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	5.5	6.5	9.5
tee-flow (run)	1.0	1.4	1.7	2.3	2.7	4.3	5.1	6.3	8.3
tee-flow (branch)	4.0	5.0	6.0	7.0	8.0	12.0	15.0	16.0	22.0


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