Gas Requirements

Gas Supply Pipe Looping and Sizing

1

3

2

6

7

8

9

 

 

 

10

5

11

134

12

T494I

1Gas Furnace (120,000 Btu/hr)

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

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

419 ft. (5.8 m)

525 ft. (7.6 m)

6Main Regulator

7Gas Meter

8Pressure Regulator (If required)

9Gas Tumblers (120,000 Btu/hr each)

10Gas Line Pressure Tap

111 in. (25.4 mm) Gas Pipe Loop

12NOTE: Minimum Pipe Size is 1/2 in. (12.7 mm)

13Shut-Off Valves

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 tumblers being fed by the main gas supply pipe.

 

= 9 x 120,000

 

= 1,080,000 Btu/hr

Using Table 9, 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 14

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