Natural Gas Pipe Sizing Chart
| Length of Pipe in Feet | Size of Pipe in Inches | ||||||||
| 1/2" | 3/4" | 1" | 1-1/4" | 1-1/2" | 2" | 2-1/2" | 3" | 4" | |
| 10 | 108 | 230 | 387 | 793 | 1237 | 2259 | 3640 | 6434 | |
| 20 | 75 | 160 | 280 | 569 | 877 | 1610 | 2613 | 5236 | 9521 |
| 30 | 61 | 129 | 224 | 471 | 719 | 1335 | 2165 | 4107 | 7859 |
| 40 | 52 | 110 | 196 | 401 | 635 | 1143 | 1867 | 3258 | 6795 |
| 50 | 46 | 98 | 177 | 364 | 560 | 1041 | 1680 | 2936 | 6142 |
| 60 | 42 | 89 | 159 | 336 | 513 | 957 | 1559 | 2684 | 5647 |
| 70 | 38 | 82 | 149 | 317 | 476 | 896 | 1447 | 2492 | 5250 |
| 80 | 36 | 76 | 140 | 239 | 443 | 840 | 1353 | 2315 | 4900 |
| 90 | 33 | 71 | 133 | 275 | 420 | 793 | 1288 | 2203 | 4667 |
| 100 | 32 | 68 | 126 | 266 | 411 | 775 | 1246 | 2128 | 4518 |
| 125 | 28 | 60 | 117 | 243 | 369 | 700 | 1143 | 1904 | 4065 |
| 150 | 25 | 54 | 105 | 215 | 327 | 625 | 1008 | 1689 | 3645 |
| 175 | 23 | 50 | 93 | 196 | 303 | 583 | 993 | 1554 | 3370 |
| 200 | 22 | 47 | 84 | 182 | 280 | 541 | 877 | 1437 | 3160 |
| 300 | 17 | 37 | 70 | 145 | 224 | 439 | 686 | 1139 | 2539 |
- Natural Gas flow is given in thousands of BTU/hr.
- One cubic foot of Natural Gas = roughly 1000 BTU
- Typical nominal pressure at the burner for Natural Gas is 3.5" of water column
- Typical machine supply pressure is 5" to 7" of water column
- Pipe length must include additional length for all fittings
- Add approximately 5 feet of pipe per fitting
Natural Gas Example: Using the chart above, a machine with a burner that requires 440,000 BTU would need a 1-1/4" pipe for a 20' run.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.