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Gas Requirements
70458301ENR6
50
Gas Supply Pipe Sizing and
Looping
Figure 22
TMB2126N
1 Gas furnace (120,000 Btu/hr. [35.2 kW]) 12 025 Series tumble dryer
2 Gas water heaters (64,000 Btu/hr. [18.7 kW] each)
(400,000 Btu/hr. [117.2 kW] each) 030 Series tumble dryer
3 Gas space heaters (73,000 Btu/hr. [21.4 kW] each)
(70,000 Btu/hr. [20.5 kW] each) 035 Series tumble dryer
4 Sediment traps, supply pressure taps and (90,000 Btu/hr. [26.4 kW] each)
shut-off valves. Refer to Figure 21. Stacked 30 Series tumble dryer
5 1 in. (25.4 mm) gas pipe loop (73,000 Btu/hr. [21.4 kW] per pocket;
6 19 ft. (5.8 m) 146,000 total Btu/hr. [42.8 kW] for machine)
7 Minimum Pipe Size is 0.5 in. (12.7 mm) Stacked 45 Series tumble dryer
8 25 ft. (7.6 m) (95,000 Btu/hr. [27.8 kW] per pocket;
9 Main regulator 190,000 total Btu/hr. [55.6 kW] for machine)
10 Gas meter 055 Series tumble dryer
11 Pressure regulator (if required) (112,000 Btu/hr. [32.8 kW] each)
SAMPLE CALCULATIONS:
Equivalent length = Total length of main gas supply pipe to the far end of the tumble dryers.
= 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 030 Series tumble dryers being fed by the main gas supply pipe.
= 9 x 73,000 (21.4)
= 657,000 Btu/hr. (192.6 kW)
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 tumble
dryers connected to single gas service. Other gas using appliances should be connected upstream from
loop.
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