CFC-E Installation Manual
Part No. 750-459 1-15
Table 1-7: Gas Line Capacity - Schedule 40 Metallic Pipe
Pipe Size
Nominal 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
Actual I.D. 1.049" 1.380" 1.610" 2.067" 2.469" 3.068" 4.026"
Length in feet **Maximum Capacity in Cubic Feet of Gas per Hour (cfh)
10 678 1,390 2,090 4,020 6,400 11,300 23,100
20 466 957 1,430 2,760 4,400 7,780 15,900
30 374 768 1,150 2,220 3,530 6,250 12,700
40 320 657 985 1,900 3,020 5,350 10,900
50 284 583 873 1,680 2,680 4,740 9,600
60 257 528 791 1,520 2,430 4,290 8,760
70 237 486 728 1,400 2,230 3,950 8,050
80 220 452 677 1,300 2,080 3,670 7,490
90 207 424 635 1,220 1,950 3,450 7,030
100 195 400 600 1,160 1,840 3,260 6,640
125 173 355 532 1,020 1,630 2,890 5,890
150 157 322 482 928 1,480 2,610 5,330
175 144 296 443 854 1,360 2,410 4,910
200 134 275 412 794 1,270 2,240 4,560
**Fuel: Natural Gas
**Inlet Pressure: Less than 2.0 psi
**Pressure Drop: 0.50" w.c.
**Specific Gravity: 0.60
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