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FLOW RATE CHART The relation of Flow to Volume is proportional. For example, the chart below shows that a 2" pipe carrying 100 GPM = 10.2 FPS. A 6" pipe carries almost twice a 4" pipe, which is almost twice a 3" pipe. DIAMETER-- in. 1.25 1.5 2 3 4 5 6 7 8 SQ. FT. 0.01 0.01 0.02 0.05 0.09 0.14 0.2 0.27 0.35 GPM @ 6.0 FPS 23 33.1 58.8 132.3 235.1 367.4 529.1 720.1 940.6 FLOW RATE -- GPM to FPS by diameter 10 2.6 1.8 1 0.5 0.3 0.2 0.1 0.1 0.1 20 5.2 3.6 2 0.9 0.5 0.3 0.2 0.2 0.1 30 7.8 5.4 3.1 1.4 0.8 0.5 0.3 0.2 0.2 40 10.5 7.3 4.1 1.8 1 0.7 0.5 0.3 0.3 50 13.1 9.1 5.1 2.3 1.3 0.8 0.6 0.4 0.3 60 15.7 10.9 6.1 2.7 1.5 1 0.7 0.5 0.4 70 18.3 12.7 7.1 3.2 1.8 1.1 0.8 0.6 0.4 80 20.9 14.5 8.2 3.6 2 1.3 0.9 0.7 0.5 90 23.5 16.3 9.2 4.1 2.3 1.5 1 0.7 0.6 100 26.1 18.1 10.2 4.5 2.6 1.6 1.1 0.8 0.6 130 34 23.6 13.3 5.9 3.3 2.1 1.5 1.1 0.8 230 60.1 41.7 23.5 10.4 5.9 3.8 2.6 1.9 1.5 360 94.1 65.3 36.7 16.3 9.2 5.9 4.1 3 2.3 520 135.9 94.4 53.1 23.6 13.3 8.5 5.9 4.3 3.3 550 143.7 99.8 56.1 24.9 14 9 6.2 4.6 3.5 720 188.1 130.6 73.5 32.7 18.4 11.8 8.2 6 4.6 940 245.6 170.6 95.9 42.6 24 15.4 10.7 7.8 6 950 248.2 172.4 97 43.1 24.2 15.5 10.8 7.9 6.1 NOTE: Maximum flow rate recommended in copper is 6 fps (if higher use Schedule 40 Black Steel Pipe).

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