46 AMP 400-1000L I&O Manual
XI(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
¾
0.824 0.5 22.9 11.4 5.7 1.0 2.1 4.6 2.1 4.1
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
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
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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