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Pipe Capacities
(Gas)
  Length of pipe in feet
Nominal
Iron Pipe
Size
Inches		 Internal
Diameter
Inches		 10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/4 .364 32 22 18 15 14 12 11 11 10 9 8 8 7 6
3/8 .493 72 49 40 34 30 27 25 23 22 21 18 17 15 14
1/2 .622 132 92 73 63 56 50 46 43 40 38 34 31 28 26
3/4 .824 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 1.049 520 350 285 245 215 195 180 170 160 150 130 120 110 100
1-1/4 1.380 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
1-1/2 1.610 1600 1100 890 760 670 610 560 530 490 460 410 380 350 320
2 2.067 3050 2100 1650 1450 1270 1150 1050 990 930 870 780 710 650 610
2-1/2 2.469 4800 3300 2700 2300 2000 1850 1700 1600 1500 1400 1250 1130 1050 980
3 3.068 8500 5900 4700 4100 3600 3250 3000 2800 2600 2500 2200 2000 1850 1700
4 4.026 17500 12000 9700 8300 7400 6800 6200 5800 5400 5100 4500 4100 3800 3500
Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 0.5 psig or less and a pressure drop of 0.3 inches water column based on a 0.60 specific gravity natural gas; if 1.5 L.P. gas is used multiply capacity by 0.633.