Alliance Laundry Systems T433I Looping, Gas Supply Pipe Sizing and

Gas Requirements

Gas Supply Pipe Sizing andLooping

	1
			3
	2
9	10	12	13
	11

8

7

4

65

T494I

1Gas Furnace (120,000 Btu/hr)

2Gas Water Heaters (400,000 Btu/hr each)

3Gas Space Heaters (70,000 Btu/hr each)

4Pressure Tap

51 in. (25.4 mm) Gas Pipe Loop

619 ft. (5.8 m)

7Minimum Pipe Size to Tumbler is 3/4 in. for 120FG, 1 in. for 170FG

825 ft. (7.6 m)

9Main Regulator

10Gas Meter

11Pressure Regulator (If required)

12Shut-Off Valves

13120 Pound Tumblers (300,000 Btu/hr each)

170 Pound Tumblers (395,000 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 120 pound tumblers being fed by the main gas supply pipe.
	= 9 x 300,000
	= 2,700,000 Btu/hr

Using Table 7, the main supply pipe diameter should be 3 in. (76 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.

IMPORTANT: Line pressure must be maintained at 7 ± 1 water column inches (1.74 ± 0.23 kPa) for Natural Gas (11 + 0.3 water column inches for L.P. [Liquefied Petroleum] Gas) (2.74 ± 0.07 kPa) with all gas appliances running (tumblers, water heaters, space heaters, furnace, etc.).

An in-line pressure regulator may be required on Natural Gas models if the line pressure exceeds 8 water column inches (2.00 kPa) pressure with all gas appliances firing.

Figure 14

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