Gas supply pipe sizing and looping – Alliance Laundry Systems Drying Cabinet User Manual
Page 34
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Gas Requirements
70304601
32
Gas Supply Pipe Sizing and Looping
Figure 13
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
11
Pressure Regulator (if required)
Shut-off Valves. Refer To Figure 12.
12
T30 Tumblers (73,000 Btu/hr per pocket;
5
1 in. (25.4 mm) Gas Pipe Loop
146,000 total Btu/hr for machine)
6
19 ft. (5.8 m)
T45 Tumblers (95,000 Btu/hr per pocket;
7
Minimum Pipe Size is 0.5 in. (12.7 mm)
190,000 total Btu/hr for machine)
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 T30 tumblers being fed by the main gas supply pipe.
= 9
x
73,000
= 657,000
Btu/hr.
Using Table 6, 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.
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