Gas Supply Pipe Sizing And Looping - ALLIANCE 120 Series Installation, Operation & Maintenance Manual

Gas Requirements
Gas Supply Pipe Sizing and
Looping
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9 10
M
1 Gas furnace (35.2 kW [120,000 Btu/hr.])
2 Gas water heaters (117.2 kW
[400,000 Btu/hr. each])
3 Gas space heaters (20.5 kW
[70,000 Btu/hr. each])
4 Sediment traps, supply pressure taps and
shut-off valves. Refer to Figure 15.
5 25.4 mm (1 in.) gas pipe loop
6 5.8 m (19 ft.)
7 Minimum Pipe Size to Tumble Dryer is
19 mm (0.75 in.) for 120 Series Gas,
25 mm (1 in.) for 170 and 200 Series Gas.
SAMPLE CALCULATIONS:
Equivalent length = Total length of main gas supply pipe to the far end of the Tumble Dryers.
= 7.6 m + 5.8 m (25 ft. + 19 ft.) gas supply pipe
= 13.4 m (44 ft.) Total Gas Line
Total Btu/hr. = The sum of the Btu/hr. of all 120 series tumble dryers being fed by the main gas supply pipe.
= 9 x 79.13 (270,000)
= 712.17 kW (2,430,000 Btu/hr.)
Using Table 7, the main supply pipe diameter should be 76 mm (3 in.).
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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© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
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8
7
8 7.6 m (25 ft.)
9 Main regulator
10 Gas meter
11 Pressure regulator (if required)
12 120 Series Tumble Dryers (79.13 kW
[270,000 Btu/hr.each])
170 Series Tumble Dryers (115.77 kW
[395,000 Btu/hr.each])
200 Series Tumble Dryers (124.56 kW
[425,000 Btu/hr. each])
Figure 16
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9
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TMB2126N
70458101 (EN)