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© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
Gas Supply Pipe Sizing and Looping
Figure 19
TMB2126N
1 Gas furnace (120,000 Btu/hr.) 7 Minimum Pipe Size is 0.5 in. (12.7 mm)
2 Gas water heaters (400,000 Btu/hr. each) 8 25 ft. (7.6 m)
3 Gas space heaters (70,000 Btu/hr. each) 9 Main regulator
4 Sediment traps, supply pressure taps and 10 Gas meter
shut-off valves. Refer to Figure 18. 11 Pressure regulator (if required)
5 1 in. (25.4 mm) gas pipe loop 12 50 pound tumblers (120,000 Btu/hr each)
6 19 ft. (5.8 m) 75 pound tumblers (165,000 Btu/hr each)
F75 pound tumblers (215,000 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 50 pound tumblers being fed by the main gas supply pipe.
= 9 x 120,000
= 1,080,000 Btu/hr.
Using Table 5, the main supply pipe diameter should be 2 in. (51 mm).
IMPORTANT: Gas loop piping 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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