Trane RT-SVX10C-EN 사용자 설명서
33
Installation (Continued)
Table 3-4
Sizing Natural Gas Pipe Mains & Branches
Sizing Natural Gas Pipe Mains & Branches
Gas Input (Cubic Feet/Hour)*
Notes:
1. If more than one unit is served by
1. If more than one unit is served by
Gas Supply
1-1/4" 1-1/2"
2"
2-1/2"
3"
4"
the same main gas supply, consider
Pipe Run (ft)
Pipe
Pipe
Pipe
Pipe
Pipe
Pipe
the total gas input (cubic feet/hr.)
10
1050
1600
3050
4800
8500 17500
and the total length when determining
20
730
1100
2100
3300
5900 12000
the appropriate gas pipe size.
30
590
890
1650
2700
4700
9700
2. Obtain the Specific Gravity and
40
500
760
1450
2300
4100
8300
BTU/Cu.Ft. from the gas company.
50
440
670
1270
2000
3600
7400
3. The following example demonstrates
60
400
610
1150
1850
3250
6800
the considerations necessary when
70
370
560
1050
1700
3000
6200
determining the actual pipe size.
80
350
530
990
1600
2800
5800
90
320
490
930
1500
2600
5400
Example: A 40' pipe run is needed to
100
305
460
870
1400
2500
5100
connect a unit with a 500 MBH furnace to a
125
275
410
780
1250
2200
4500
natural gas supply having a rating of 1,000
150
250
380
710
1130
2000
4100
BTU/Cu.Ft. and a specific gravity of 0.60
175
225
350
650
1050
1850
3800
200
210
320
610
980
1700
3500
Cu.Ft/Hour = Furnace MBH Input
* Table is based on a specific gravity of 0.60. Use Table 3-1 for Gas BTU/Cu.Ft. X Multiplier (Table 3-1)
specific gravity of the local gas supply.
specific gravity of the local gas supply.
Cu.Ft/Hour = 500
Table 3 indicates that a 1-1/4" pipe is required.
Table 3 indicates that a 1-1/4" pipe is required.
Specific Gravity Multipliers
Specific
Gas Heating Capacity Altitude Correction Factors
Gravity
Multiplier
0.50
1.10
Sea Level 2001 2501 3501 4501 5501 6501
0.55
1.04
To 2000 To 2500 To 3500 To 4500 To 5500 To 6500 To 7500
0.60
1.00
Capacity
0.65
0.96
Multiplier 1.00 .92 .88 .84 .80 .76 .72
Note: Correction factors are per AGA Std. 221.30 - 1964, Part VI, 6.12.
Local codes may supersede.
Note: Correction factors are per AGA Std. 221.30 - 1964, Part VI, 6.12.
Local codes may supersede.
Altitude (Ft.)
Figure 3-10
Unit Gas Trains (Natural Gas)
235 and 350 MBH
500 and 850 MBH