Speed Queen TMB796C Gas Supply Pipe Sizing and Looping

Gas Requirements

Gas Supply Pipe Sizing and Looping

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				2					3
9	10					11							12
								1		2	3	4	5		6	7	8	9
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			M
																		5
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							7							6						TMB2126N
1	Gas furnace (120,000 Btu/hr.)					7	Minimum Pipe Size is 0.5 in. (12.7 mm)
2	Gas water heaters (400,000 Btu/hr. each)					8	25 ft. (7.6 m)
3	Gas space heaters (70,000 Btu/hr. each)					9	Main regulator
4	Sediment traps, supply pressure taps and					10	Gas meter
	shut-off valves. Refer to Figure 18.					11	Pressure regulator (if required)
5	1 in. (25.4 mm) gas pipe loop					12	50 pound tumblers (120,000 Btu/hr each)
6	19 ft. (5.8 m)						75 pound tumblers (165,000 Btu/hr each)
							F75 pound tumblers (215,000 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 50 pound tumblers being fed by the main gas supply pipe.
	=	9 x 120,000
	=	1,080,000 Btu/hr.

Using Table 5, 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.

Figure 19

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