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GHND-SVX01A-EN • High Efficiency Propeller Fan Gas Unit Heater 17
Gas Supply Piping
Notes: Determine the required Cu. Ft. / Hr. by dividing the rated heater input by 1000. For SI / Metric
measurements: Convert unit Btu. / Hr. to kilowatts. Multiply the units input (kW) by 0.0965 to determine
Cubic Meters / Hour.
Notes: FOR NATURAL GAS: Select the pipe size directly from the table.
Notes: FOR PROPANE GAS: Multiply the Cu. Ft. / Hr. (Cubic Meters per Hour) value by 0.633; then use the table.
Table 3.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Internal
Length of Pipe, Feet
Pipe
Size Dia. 10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
1 1/4 1.38 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
1 1/2 1.61 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
Gas Pipe Size