Trane IntelliPak 1 Installation, Operation And Maintenance Manual page 42

I I n n s s t t a a l l l l a a t t i i o o n n
configuration.
1. Connect the supply gas piping using a "ground-
joint" type union to the furnace gas train and check
for leaks.
2. Adjust the inlet supply pressure to the
Table 14. Sizing natural gas pipe mains and branches
Gas SupplyPipe Run
(ft)
10
20
30
40
50
60
70
80
90
100
125
150
175
200
Notes:
1. Table is based upon specific gravity of 0.60. Refer to the latest edition of the National Fuel Gas Code, Z223.1, unless superseded by local gas codes.
2. If more than one unit is served by the same main gas supply, consider the total gas input (cubic feet/hr.) and the total length when determining
the appropriate gas pipe size.
3. Obtain the Specific Gravity and BTU/Cu.Ft. from the gas company.
4. The following example demonstrates the considerations necessary when determining the actual pipe size:
Example: A 40' pipe run is needed to connect a unit with a 850 MBH furnace to a natural gas supply having a rating of 1,000 BTU/Cu.Ft. and a
specific gravity of 0.60
Cu.Ft/Hour = Furnace MBH Input
Gas BTU/Cu.Ft. X Multiplier
Cu.Ft/Hour = 850
The above table indicates that a 2" pipe is required.
Table 15. Specific gravity multipliers
Specific
Gravity Multiplier
0.50 1.10
0.55 1.04
0.60 1.00
0.65 0.96
42
1¼" Pipe 1½" Pipe
1,060 1,580
1,090
726
583 873
499 747
442 662
400 600
368 552
343 514
322 482
304 455
269 403
244 366
224 336
209 313
Table 15, p. 42
recommended 7" to 14" w.c. parameter for natural
gas.
3. Ensure that the piping is adequately supported to
avoid gas train stress.
Gas Input (Cubic Feet/Hour)
2" Pipe 2½" Pipe
3,050 4,860
2,090 3,340
1,680 2,680
1,440 2,290
1,280 2,030
1,160 1,840
1,060 1,690
1,580
989
1,480
928
1,400
877
1,240
777
1,120
704
1,030
648
602 960
3" Pipe 4" Pipe
8,580 17,500
5,900 12,000
4,740 9,660
4,050 8,270
3,590 7,330
3,260 6,640
3,000 6,110
2,790 5,680
2,610 5,330
2,470 5,040
2,190 4,460
1,980 4,050
1,820 3,720
1,700 3,460
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