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Gas Requirements
33
70420801 (EN)
Gas Supply Pipe Sizing and Looping
Figure 11
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
Shut-Off Valves. Refer to Figure 10.
Shut-Off Valves. Refer to Figure 10.
11
Pressure Regulator (If required)
12
120 Pound tumble dryers (270,000 Btu/hr. each)
170 Pound tumble dryers (395,000 Btu/hr. each)
170 Pound tumble dryers (395,000 Btu/hr. each)
5
1 in. (25.4 mm) Gas Pipe Loop
6
19 ft. (5.8 m)
'
7
Minimum Pipe Size to Tumble dryer is 0.75 in. for
120 Pound Gas, 1 in. for 170 Pound Gas
120 Pound Gas, 1 in. for 170 Pound Gas
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
= 44 ft. (13.4 m) total gas line
Total Btu/hr.
= The sum of the Btu/hr. of all 120 pound tumble dryers being fed by the main gas supply pipe.
= 9 x 270,000
= 2,430,000 Btu/hr.
= 9 x 270,000
= 2,430,000 Btu/hr.
Using Table 7, the main supply pipe diameter should be 3 in. (76 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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12
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