Trane Voyager RT-SVX17C-EN Installation Operation & Maintenance page 18

Table 5
Sizing Natural Gas Pipe Mains & Branches
Gas Input (Cubic Feet/Hour)*
Gas Supply 1-1/4"
Pipe Run (ft) Pipe
10
1050
20
730
30
590
40
500
50 440
60 400
70
370
80
350
90
320
100 305
125 275
150
250
175
225
200
210
* Table is based on a specific gravity of 0.60. Use Table 5-1 for the
specific gravity of the local gas supply.
Table 5-1
Specific Gravity Multipliers
Specific
Gravity Multiplier
0.5 1.1
0.55 1.04
0.6 1
0.65 0.96
Figure 7
Gas Train Configuration for Low Heat units (High Heat Units utilize two Gas Trains.)
1-1/2" 2" 2-1/2"
Pipe Pipe Pipe
1600 3050 4800
1100 2100 3300
890 1650 2700
760 1450 2300
670 1270 2000
610 1150 1850
560 1050 1700
530 990 1600
490 930 1500
460 870 1400
410 780 1250
380 710 1130
350 650 1050
320 610 980
Notes:
1. If more than one unit is served by
3" 4"
the same main gas supply, consider
Pipe Pipe the total gas input (cubic feet/hr.)
and the total length when determining
8500 17500 the appropriate gas pipe size.
5900 12000 2. Obtain the Specific Gravity and
4700 9700 BTU/Cu.Ft. from the gas company.
4100 8300 3. The following example demonstrates
3600 7400 the considerations necessary when
3250 6800 determining the actual pipe size.
3000 6200
2800 5800 Example: A 40' pipe run is needed to
2600 5400 connect a unit with a 500 MBH furnace to a
2500 5100 natural gas supply having a rating of 1,000
2200 4500 BTU/Cu.Ft. and a specific gravity of 0.60
2000 4100
Cu.Ft/Hour = Furnace MBH Input
1850 3800
1700 3500
Table 5 indicates that a 1-1/4" pipe is required.
18
Gas BTU/Cu.Ft. X Multiplier (Table 5-1)
Cu.Ft/Hour = 500