60
XII(continued)
Natural Gas, Inlet Pressure 14.0 in wc (3.4 kPa)or less; 0.5 in wc (0.12 kPa) Pressure Drop
Nominal
Pipe Size
(In)
Inside
Diameter
(In)
20 30 40 50 60 70 80 90 100
½ 0.622 172 118 95 81 72 65 60 56 52 50
¾ 0.824 360 247 199 170 151 137 126 117 110 104
1 1.049 678 466 374 320 284 257 237 220 207 195
1¼ 1.380 1390 957 768 657 583 528 486 452 424 400
1½ 1.610 2090 1430 1150 985 873 791 728 677 635 600
2 2.067 4020 2760 2220 1900 1680 1520 1400 1300 1220 1160
2½ 2.469 6400 4400 3530 3020 2680 2430 2230 2080 1950 1840
3 3.068 11300 7780 6250 5350 4740 4290 3950 3674 3450 3260
*1 CFH of Natural Gas is approximately equal to 1 MBH; contact your gas suppliers for the actual heating value of your gas.
Nominal
Pipe Size
Inside
Diameter
(in)
Valves (Screwed) - Fully Open Screwed Fittings
Gate Globe Angle
Swing
Check
45°
Elbow
90°
Elbow
180 Close
Return
Bend
90 Tee
Flow
Through
Run
90 Tee, Flow
Through
Branch
0.622 0.4 17.3 8.7 4.3 0.7 1.6 3.5 1.6 3.1
0.824 0.5 22.9 11.4 5.7 1.0 2.1 4.6 2.1 4.1
1.049 0.6 29.1 14.6 7.3 1.2 2.6 5.8 2.6 5.2
1.38 0.8 38.3 19.1 9.6 1.6 3.5 7.7 3.5 6.9
1.61 0.9 44.7 22.4 11.2 1.9 4.0 9.0 4.0 8.0
2.067 1.2 57.4 28.7 14.4 2.4 5.2 11.5 5.2 10.3
2.469 1.4 68.5 34.3 17.1 2.9 6.2 13.7 6.2 12.3
3.068 1.8 85.2 42.6 21.3 3.6 7.7 17.1 7.7 15.3
Propane Gas, Inlet Pressure 11.0 in wc (2.7 kPa); 0.5 in wc (0.12 kPa) Pressure Drop
Nominal
Pipe Size
(In)
Inside
Diameter
(In)
20 30 40 50 60 70 80 90 100
½ 0.622 116 80 64 55 48 44 40 38 35 33
¾ 0.824 242 166 134 114 101 92 85 79 74 70
1 1.049 456 314 252 215 191 173 159 148 139 131
1¼ 1.380 937 644 517 442 392 355 327 304 285 269
1½ 1.610 1403 964 775 663 588 532 490 456 427 404
2 2.067 2703 1858 1492 1277 1131 1025 943 877 823 778
2½ 2.469 4308 2961 2377 2035 1803 1634 1503 1399 1312 1239
3 3.068 7615 5234 4203 3567 3188 2889 2658 2472 2320 2191
*1 CFH of LP gas is approximately equal to 2.5 MBH; contact your gas supplier for the actual heating value of your gas.
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