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Gas Supply Pipe Sizing and Looping
Figure 13
TMB2126N
1 Gas Furnace (120,000 Btu/hr) 8 25 ft. (7.6 m)
2 Gas Water Heaters (400,000 Btu/hr each) 9 Main Regulator
3 Gas Space Heaters (70,000 Btu/hr each) 10 Gas Meter
4 Sediment Traps, Supply Pressure Taps and 11 Pressure Regulator (If required)
Shut-Off Valves. Refer to Figure 12. 12 25 Pound Tumblers (64,000 Btu/hr each)
5 1 in. (25.4 mm) Pipe for Gas Loop 30 Pound Tumblers (73,000 Btu/hr each)
6 19 ft. (5.8 m) T30 Tumblers (73,000 Btu/hr each)
7 Minimum pipe size to tumbler is 0.5 in. (12.7 mm). 35 Pound Tumblers (90,000 Btu/hr each)
SAMPLE CALCULATIONS:
Equivalent length = Total length of main gas supply pipe to the far end of the tumblers.
= 25 ft. + 19 ft. (7.6 m + 5.8 m) gas supply pipe
= 44 ft
. (13.4 m) Total Gas Line
Total Btu/hr = The sum of the Btu/hr of all 30 pound tumblers being fed by the main gas supply pipe.
= 9 x 73,000
= 657,000 Btu/hr
Using Table 6, the main supply pipe diameter should be 2 in. (51 mm).
IMPORTANT: Gas pipe loop must be installed as illustrated to equalize gas pressure for all tumblers
connected to single gas service. Other gas using appliances should be connected upstream from loop.
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