Gas Supply Pipe Sizing And Looping - Alliance Laundry Systems DA0220SRG Instalación

Gas Supply Pipe Sizing and Looping

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9 10
1 Gas Furnace (120,000 Btu/hr)
2 Gas Water Heaters (400,000 Btu/hr each)
3 Gas Space Heaters (70,000 Btu/hr each)
4 Gas Line Pressure Tap
5 1 in. (25.4 mm) Pipe for Gas Loop
6 19 ft. (5.8 m)
7 NOTE: Minimum pipe size to tumbler is 1/2 in. (12.7 mm).
8 25 ft. (7.6 m)
9 Main Regulator
10 Gas Meter
11 Pressure Regulator (If required)
12 Gas Shut-Off Valve
13 Gas Tumblers (75,000 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
°
Total Btu/hr = The sum of the Btu/hr of all tumblers being fed by the main gas supply pipe.
= 9 x 75,000
= 675,000 Btu/hr
Using Table 14, 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.
70223701
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8
(13.4 m) Total Gas Line
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Figure 15
Gas Requirements
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13
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T494I
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