Laars MFTHW199 - Page 32

LAARS Heating Systems
Page 30
4.9 Gas Supply and Piping (continued)
Natural Gas Pipe Sizing (Maximum)
Maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 0.5psi or less
and a pressure drop of 0.5 Inch water column. (Based of a 0.60 Specic gravity gas)
For reference only. Referenced from gas pipe manufacturer specications for actual delivery capacity. The
DOE standard for Natural Gas is 1100 BTU/ft
3
. Contact the local gas supplier for actual BTU/ft
3
rating.
Pipe
size
Length (ft)
10 20 30 40 50 60 80 100 150 200
1/2˝ 82 58 47 41 37 37 29 26 20 18
3/4˝ 192 137 112 97 87 80 69 62 48 44
1˝ 383 269 218 188 168 153 132 118 91 82
1-1/4˝ 639 456 374 325 292 267 232 208 171 148
1-1/2˝ 1260 888 723 625 559 509 440 393 320 277
2˝ 2930 2080 1700 1470 1320 1200 1040 933 762 661
Pipe
size
Length (ft)
10 20 30 40 50 60 80 100 150 200
1/2˝ 172 118 95 81 72 65 56 50 40 34
3/4˝ 360 247 199 170 151 137 117 104 83 71
1˝ 678 466 374 320 284 257 220 195 157 134
1-1/4˝ 1390 957 768 657 583 528 452 400 322 275
1-1/2˝ 2090 1430 1150 985 873 791 677 600 482 412
2˝ 4020 2760 2220 1900 1680 1520 1300 1160 928 794
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
(Refer to the ANSI Z223.1 NATIONAL
FUEL GAS CODE 2012 EDITION)
Table 11. Length of Corrugated Stainless Steel Pipe.
Table 12. Length of Black Iron Pipe (Schedule 40 Metallic)