Full Range Flows by Pipe Size

Gage Range (in W.C.)Media @ 70°FFull Flows by Pipe Size (Approximate)
1″1¼″1½″2″2½″3″4″5″8″10″
2 Water (GPM) 4.8 8.3 11.5 20.5 30 49 86 205 350 560
Air @ 14.7 PSIA (SCFM) 19.0 33.0 42.0 65.0 113 183 330 760 1340 2130
Air @ 100 PSIG (SCFM) 50.0 90.5 120 210 325 510 920 2050 3600 6000
5 Water (GPM) 7.7 14.0 18.0 34.0 47.0 78.0 138 320 560 890
Air @ 14.7 PSIA (SCFM) 30.0 51.0 66.0 118 178 289 510 1200 2150 3400
Air @ 100 PSIG (SCFM) 83.0 142 190 340 610 820 1600 3300 5700 10000
10 Water (GPM) 11.0 19.0 25.5 45.5 67.0 110 195 450 800 1260
Air @ 14.7 PSIA (SCFM) 41.0 72.0 93.0 163 250 410 725 1690 3040 4860
Air @ 100 PSIG (SCFM) 120 205 275 470 740 1100 2000 4600 8100 15000
25 Water (GPM) 18.0 32.0 40.5 72.0 108 173 310 720 1250 2000
Air @ 14.7 PSIA (SCFM) 63.0 112 155 255 390 640 1130 2630 4860 7700
Air @ 100 PSIG (SCFM) 185 325 430 760 1200 1800 3300 7200 13000 22000
50 Water (GPM) 25.0 44.0 57.5 100 152 247 435 1000 1800  
Air @ 14.7 PSIA (SCFM) 90.0 161 205 360 560 900 1600 3700 6400  
Air @ 100 PSIG (SCFM) 260 460 620 1050 1700 2600 4600 1000 18500  
100 Water (GPM) 36.5 62.0 82.0 142 220 350 620 1500    
Air @ 14.7 PSIA (SCFM) 135 230 300 505 800 1290 2290 5000    
Air @ 100 PSIG (SCFM) 370 660 870 1500 2300 3600 6500 15000    

 

Pressure Correction Factors

Regulator Inlet PressurePressure Factor
1 psig 1.05
2 psig 1.11
3 psig 1.18
4 psig 1.25
5 psig 1.32
6 psig 1.39
7 psig 1.45
8 psig 1.52
9 psig 1.59
10 psig 1.66
11 psig 1.72
12 psig 1.81
13 psig 1.86
14 psig 1.93
15 psig 2.0

To set desired input change BTU input on boiler to cu. ft. by subtracting the last 3 zeros. If gas supply pressure is over 1 psig take the corresponding pressure factor from the above chart and divide it into the input. This is the actual input required at the supply pressure.

Example:

The boiler input is equal to 2,500,000 BTU minus 3 zeros = 2,500 cu. ft. input. The gas supply pressure is 2 psig = 1. 11 correction factor. 2,500 ? 1.11 = 2,250. 2,250 = 16 seconds on 10 cu. ft. dial.

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