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Gas Pipe Sizing Chart for Natural Gas or Liquid Propane

Scroll down for Liquid Propane

Natural Gas

Pipe Length (feet) 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 - 2 1/2" 3" 4"
10 108 230 387 793 1237 2259 3640 6434 -
20 75 168 280 569 877 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 (NG) flow is given in thousands of BTU per hour. One cubic foot of natural gas = 1000 BTU.
  • Nominal pressure at the burner for natural gas is 3.5 inches of water column. (Typical machine supply 5-7 Inches)
  • Pipe length must include additional lengths for all fittings. Add approximately 5 feet of pipe per fitting.
  •  EXAMPLE: A machine with a burner that requires 440,000 BTU you need a 1 1/4 inch pipe for a 20 foot long run.

 

Liquid Propane

Pipe Length (feet) 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 - 2 1/2" 3" 4"
10 275 567 1071 2205 3307 6221 10140 17990 35710
20 189 393 732 1496 2299 4331 7046 12510 25520
30 152 315 590 1212 1858 3465 5695 10110 20620
40 129 267 504 1039 1559 2992 4778 8481 17300
50 114 237 448 913 1417 2646 4343 7708 15730
60 103 217 409 834 1275 2394 3908 6936 14150
70 89 185 346 724 1086 2047 3329 5908 12050
80 78 162 307 630 976 1811 2991 5309 10830
90 69 146 275 567 866 1606 2654 4711 9613
100 63 132 252 511 787 1496 2412 4281 8736
125 54 112 209 439 665 1282 2083 3618 7382
150 48 100 185 390 590 1138 1808 3210 6549
175 43 90 168 353 534 1030 1637 2905 5927
200 40 83 155 325 491 947 1505 2671 5450
300 37 77 144 303 458 887 1404 2492 5084

 

  • Liquid Propane (LP) flow is given in thousands of BTU per hour. One cubic foot of LP = 2516 BTU
  • This chart refers to low pressure LP, after regulation, standard nominal pressure at the burner for LP gas is 11 inches of water column
  • Pipe length must include additional length for all fittings. Add approximately 5 feet of pipe per fitting
  • EXAMPLE: A machine with a burner that requires 440,000 BTU would need a 1 inch pipe for a 20 foot long run

 

Last updated on September 21st 2020.