Section 2 — Installation
Part No. 750-263 2-13
To verify the input of each device that is connected to the gas piping,
obtain the btu/hr input and divide this input by the calorific value of
the gas that will be utilized. For instance, a unit with 750,000 btu/
hr input divided by a gas calorific value of 1060 will result in a cfh
flow of 707. The single boiler is approximately 20 feet from the gas
supply header source. And with a measured gas supply pressure of
10" w.c. we find from Table 2-2 that a supply pipe size of 1-1/4"
should be used as a minimum.
Table 2-2: 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. 1.04
9
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)
10 514 1,060 1,580 3,050 4,860 8,580 17,500
20 363 726 1,090 2,090 3,340 5,900 12,000
30 284 583 873 1,680 2,680 4,740 9,660
40 243 499 747 1,440 2,290 4,050 8,290
50 215 442 662 1,280 2,030 3,590 7,330
60 195 400 600 1,160 1,840 3,260 6,640
70 179 368 552 1,060 1,690 3,000 6,110
80 167 343 514 989 1,580 2,790 5,680
90 157 322 482 928 1,480 2,610 5,330
100 148 304 455 877 1,400 2,470 5,040
125 131 269 403 777 1,240 2,190 4,460
150 119 244 366 704 1,120 1,980 4,050
175 109 209 336 648 1,030 1,820 3,720
200 102 185 313 602 960 1,700 3,460
**Fuel: Natural Gas
**Inlet Pressure: Less than 2.0 psi
**Pressure Drop: 0.30" w.c.
**Specific Gravity: 0.60
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