Friction (PSI) Loss & Water Velocity (Feet Per Second) Chart 0.00 0.01 0.01 0.01 0.02 0.02 0.03 0.04 0.04 0.05 0.07 0.09 0.11 0.13 0.16 0.19 0.22 0.25 0.29 0.38 0.49 0.60 0.73 0.88 1.03 1.19 1.37 1.56 1.75 1.96 2.18 2.41 2.65 3.16 3.72 4.31 4.94 5.62 6.33 7.08 7.87 8.70 9.57 11.90 14.47 17.26 0.20 0.26 0.33 0.40 0.46 0.53 0.60 0.66 0.73 0.80 0.93 1.07 1.20 1.33 1.47 1.60 1.74 1.87 2.00 2.34 2.67 3.01 3.34 3.68 4.01 4.35 4.68 5.01 5.35 5.68 6.02 6.35 6.69 7.36 8.03 8.70 9.37 10.03 10.70 11.37 12.04 12.71 13.38 15.05 16.73 18.40 0.00 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.13 0.17 0.21 0.26 0.30 0.36 0.41 0.48 0.54 0.61 0.68 0.76 0.84 0.92 1.10 1.29 1.50 1.72 1.98 2.20 2.46 2.74 3.02 3.33 4.14 5.03 6.00 7.05 8.17 9.38 10.65 12.01 13.43 14.93 0.21 0.26 0.30 0.34 0.39 0.43 0.47 0.52 0.60 0.69 0.78 0.86 0.95 1.04 1.12 1.21 1.30 1.51 1.73 1.95 2.16 2.38 2.60 2.81 3.03 3.25 3.46 3.68 3.90 4.11 4.33 4.76 5.20 5.63 6.06 6.50 6.93 7.36 7.80 8.23 8.66 9.75 10.83 11.92 13.00 14.08 15.17 16.25 17.33 18.42 19.50 NOTE: Shaded areas of chart indicate velocities over 5' per second. Use with Caution. 0.00 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.06 0.07 0.08 0.09 0.11 0.13 0.14 0.16 0.18 0.20 0.22 0.24 0.29 0.34 0.40 0.45 0.52 0.58 0.65 0.72 0.80 0.88 1.09 1.33 1.58 1.86 2.16 2.47 2.81 3.16 3.54 3.93 4.35 4.78 5.70 6.70 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.88 1.00 1.13 1.25 1.38 1.51 1.63 1.76 1.88 2.01 2.13 2.26 2.39 2.51 2.76 3.02 3.27 3.52 3.77 4.02 4.27 4.53 4.78 5.03 5.66 6.29 6.92 7.55 8.18 8.81 9.43 10.06 10.69 11.32 11.95 12.58 13.84 15.10 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.04 0.05 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.15 0.18 0.22 0.25 0.29 0.34 0.38 0.43 0.48 0.54 0.59 0.65 0.78 0.91 0.38 0.44 0.49 0.55 0.61 0.66 0.72 0.77 0.83 0.88 0.94 0.99 1.05 1.10 1.22 1.33 1.44 1.55 1.66 1.77 1.88 1.99 2.10 2.21 2.49 2.77 3.05 3.32 3.60 3.88 4.15 4.43 4.71 4.99 5.26 5.54 6.10 6.65 Flow GPM Velocity F.P.S. PSI Loss 6" Velocity F.P.S. PSI Loss 4” Velocity F.P.S. 3” PSI Loss 0.19 0.28 0.38 0.47 0.57 0.66 0.76 0.85 0.95 1.05 1.14 1.33 1.52 1.71 1.90 2.10 2.29 2.48 2.67 2.86 3.34 3.81 4.29 4.77 5.25 5.72 6.20 6.68 7.16 7.63 8.11 8.59 9.07 9.54 10.50 11.45 12.41 13.36 14.32 15.27 16.23 17.18 18.14 19.09 Velocity F.P.S. 0.00 0.01 0.02 0.02 0.03 0.05 0.06 0.07 0.09 0.11 0.12 0.17 0.21 0.26 0.32 0.38 0.45 0.52 0.60 0.68 0.90 1.15 1.43 1.74 2.08 2.44 2.83 3.25 3.69 4.16 4.66 5.18 5.72 6.29 7.51 8.82 10.23 11.74 13.33 15.03 16.81 18.69 20.66 22.72 PSI Loss 0.15 0.31 0.47 0.62 0.78 0.94 1.10 1.25 1.41 1.57 1.73 1.88 2.20 2.51 2.83 3.14 3.46 3.77 4.09 4.40 4.72 5.50 6.29 7.08 7.87 8.65 9.44 10.23 11.01 11.80 12.59 13.37 14.16 14.95 15.74 17.31 18.88 21/2” Velocity F.P.S. 0.00 0.02 0.03 0.05 0.08 0.12 0.15 0.20 0.25 0.30 0.36 0.42 0.56 0.71 0.89 1.08 1.29 1.51 1.75 2.01 2.28 3.04 3.89 4.84 5.88 7.01 8.24 9.56 10.96 12.46 14.04 15.71 17.46 19.30 21.22 25.32 29.75 2” PSI Loss Velocity F.P.S. 0.37 0.01 0.21 0.74 0.03 0.42 1.11 0.07 0.64 1.48 0.12 0.85 1.85 0.18 1.07 2.22 0.25 1.28 2.59 0.33 1.49 2.96 0.42 1.71 3.33 0.52 1.92 3.70 0.63 2.14 4.07 0.75 2.35 4.44 0.89 2.57 5.19 1.18 2.99 5.93 1.51 3.42 6.67 1.88 3.85 7.41 2.28 4.28 8.15 2.72 4.71 8.89 3.20 5.14 9.64 3.17 5.57 10.38 4.25 5.99 11.12 4.83 6.42 12.97 6.43 7.49 14.83 8.23 8.56 16.68 10.24 9.64 18.53 12.45 10.71 14.85 11.78 17.45 12.85 20.23 13.92 23.21 14.99 26.37 16.06 29.72 17.13 33.26 18.21 36.97 19.28 11/2” PSI Loss 0.03 0.12 0.26 0.44 0.66 0.93 1.24 1.59 1.97 2.40 2.86 3.36 4.47 5.73 7.13 8.66 10.33 12.14 14.08 16.15 18.35 24.42 31.27 38.89 47.27 Velocity F.P.S. 0.60 1.20 1.80 2.40 3.00 3.60 4.20 4.80 5.40 6.00 6.60 7.21 8.41 9.61 10.81 12.01 13.21 14.42 15.62 16.82 18.02 11/4” PSI Loss 0.11 0.39 0.84 1.42 2.15 3.02 4.01 5.14 6.39 7.77 9.27 10.89 14.48 18.55 23.07 28.04 33.45 39.30 45.58 52.28 59.41 1” Velocity F.P.S. 0.43 1.55 3.28 5.60 8.56 11.86 15.77 20.20 25.12 30.54 36.43 42.80 56.94 72.92 90.69 110.23 PVC Sch 40 Pipe (Loss in PSI Per 100 ft of Pipe) PSI Loss Velocity F.P.S. 0.32 1.14 2.42 4.13 6.24 8.75 11.64 14.90 18.54 22.53 26.88 31.58 42.01 53.80 66.92 81.34 Velocity F.P.S. PSI Loss 1 2 3 4 5 6 7 8 9 10 11 12 14 16 18 20 22 24 26 28 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 110 120 130 140 150 160 170 180 190 200 225 250 275 300 325 350 375 400 425 450 475 500 550 600 3/4” PSI Loss Flow GPM 1/2” 1 2 3 4 5 6 7 8 9 10 11 12 14 16 18 20 22 24 26 28 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 110 120 130 140 150 160 170 180 190 200 225 250 275 300 325 350 375 400 425 450 475 500 550 600
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