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Gas Supply Pipe Looping and Sizing
Figure 14
T494I
1 Gas Furnace (120,000 Btu/hr)
2 Gas Water Heaters (400,000 Btu/hr each)
3 Gas Space Heaters (70,000 Btu/hr each)
4 19 ft. (5.8 m)
5 25 ft. (7.6 m)
6 Main Regulator
7 Gas Meter
8 Pressure Regulator (If required)
9 Gas Tumblers (120,000 Btu/hr each)
10 Gas Line Pressure Tap
11 1 in. (25.4 mm) Gas Pipe Loop
12 NOTE: Minimum Pipe Size is 1/2 in. (12.7 mm)
13 Shut-Off Valves
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 tumblers being fed by the main gas supply pipe.
= 9 x 120,000
= 1,080,000 Btu/hr
Using Table 9, 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.
6
9
5
4
3
2
1
7
8
13
11
12
10