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Gas Requirements
70457901ENR7
40
Gas Supply Pipe Sizing and
Looping
Figure 23
TMB2126N
1
Gas furnace
8
25 ft. (7.6 m)
(120,000 Btu/hr. [127 Mj/hr., 35.2 kW])
9
Main regulator
2
Gas water heaters
10
Gas meter
(400,000 Btu/hr. [422 Mj/hr., 117.2 kW] each)
11
Pressure regulator (if required)
3
Gas space heaters
12
050 series tumble dryers
(70,000 Btu/hr. [79 Mj/hr., 20.5 kW] each)
(130,000 Btu/hr. [137 Mj/hr., 38.1 kW] each)
4
Sediment traps, supply pressure taps and
075 series tumble dryers
shut-off valves. Refer to
Figure 22
.
(165,000 Btu/hr. [174 Mj/hr., 48.359 kW] each)
5
1 in. (25.4 mm) gas pipe loop
F75 series tumble dryers
6
19 ft. (5.8 m)
(225,000 Btu/hr. [237 Mj/hr., 65.94 kW] each)
7
Minimum Pipe Size is 0.5 in. (12.7 mm)
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 050 series tumble dryers being fed by the main gas supply pipe.
= 9 x 130,000 (137, 38.1)
= 1,170,000 Btu/hr. (1,234 Mj/hr., 342.9 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.
1
2
3
4
5
6
7
8
9
M
9
12
8
6
3
2
1
10
11
7
5
4