TriangleTube Marquis TWH180, Installation Manual

Page: 17 / 39

Gas Piping
14
Natural Gas Pipe Sizing
Maximum capacity of pipe in cubic feet of gas per hour for
gas pressures of 0.5 psi or less and a pressure drop of 0.5
inch water column. (Based of a 0.60 Specific gravity gas).
Propane Gas Pipe Sizing
Intended use: pipe sizing between single-or second-
stage (low pressure) regulator and appliance.
Inlet Pressure: 11in. w.c/Pressure Drop: 0.5 in w.c.
/Specific Gravity: 1.5
Model TWH
18
0 / TWH
18
0LP
Maximum Input
(BTU/H)
1
80
,000
Indoor make up air is pro-
vided, a minimum free area
of 1 Inch per 1,000 BTU/H
1
80
square inches
1
3
1/
2
” (W) x 1
3
1/
2
” (H)
Refer to the ANSI Z223.1 National Fuel Gas Code 2012 Edition)
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
Length of Black Iron Pipe (Schedule 40 Metallic)
Length of Black Iron Pipe (Schedule 40 Metallic)
Pipe Size
Length (ft)
10 20 30 40 50 60 80 100 150 200
1/2” 291 200 160 137 122 110 101 94 84 67
3/4” 608 418 336 287 255 231 212 197 175 140
1” 1150 787 632 541 480 434 400 372 330 265
1-1/4” 2350 1620 1300 1110 985 892 821 763 677 543
1-1/2” 3520 2420 1940 1660 1480 1340 1230 1140 1010 814
2” 6790 4660 3750 3210 2840 2570 2370 2200 1950 1570
Refer to the ANSI Z223.1 National Fuel Gas Code 2012 Edition)
Marquis Manual_61515_Water Heater 7/1/15 1:58 PM Page 17