Alliance Laundry Systems 70269701R4 Gas Supply Pipe Sizing and Looping

Gas Requirements

Gas Supply Pipe Sizing and Looping

1

3

2

9	10
				11						12
						1	2	3	4		5		6	7	8	9
																		4
		M															5
			8
				7
												6						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.

Figure 13

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