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 us e 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 Interna l
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