Gas supply pipe sizing and looping – Alliance Laundry Systems 70269701R4 User Manual
Page 43
Gas Requirements
41
70269701
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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
25 Pound Tumblers (64,000 Btu/hr each)
5
1 in. (25.4 mm) Pipe for Gas Loop
30 Pound Tumblers (73,000 Btu/hr each)
6
19 ft. (5.8 m)
T30 Tumblers (73,000 Btu/hr each)
7
Minimum pipe size to tumbler is 0.5 in. (12.7 mm).
35 Pound Tumblers (90,000 Btu/hr each)
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 30 pound 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 pipe loop 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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