Installation
RT-SVX24J-EN
69
Table 16. Sizing natural gas pipe mains and branches
Gas Supply
Pipe Run
(ft)
Gas Input (Cubic Feet/Hour)*
1¼"
Pipe
1½"
Pipe
2"
Pipe
2½"
Pipe
3"
Pipe
4"
Pipe
10
1050
1600
3050
4800
8500
17500
20
730
1100
2100
3300
5900
12000
30
590
890
1650
2700
4700
9700
40
500
760
1450
2300
4100
8300
50
440
670
1270
2000
3600
7400
60
400
610
1150
1850
3250
6800
70
370
560
1050
1700
3000
6200
80
350
530
990
1600
2800
5800
90
320
490
930
1500
2600
5400
100
305
460
870
1400
2500
5100
125
275
410
780
1250
2200
4500
150
250
380
710
1130
2000
4100
175
225
350
650
1050
1850
3800
200
210
320
610
980
1700
3500
Notes:
1. *Table is based on a specific gravity of 0.60. Use
Table
17,
p. 69
for
the specific gravity of the local gas supply.
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
Table
17,
p. 69
Cu.Ft/Hour = 850
Table
16,
p. 69
indicates that a 2" pipe is required.
Table 17. Specific gravity multipliers
Specific
Gravity
Multiplier
0.50
1.10
0.55
1.04
0.60
1.00
0.65
0.96
Table 18. Gas heating capacity altitude correction factors
Altitude (Ft.)
Sea Level
To 2000
2001 to
2500
2501 to
3500
3501 to
4500
4501 to
5500
5501 to
6500
6501 to
7500
Capacity
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.
Figure 46. Two-stage natural gas train for 850, 1100 Mbh heaters
Содержание SEHJ090-162
Страница 40: ...Dimensional Data 40 RT SVX24J EN Figure 13 Evaporative condenser water connection locations RIGHT SIDE VIEW ...
Страница 48: ...Installation 48 RT SVX24J EN Figure 18 Ductwork conversion ...
Страница 58: ...Installation 58 RT SVX24J EN Figure 36 5 Connected tubes 6 install panels Connected tubes 5 6 ...
Страница 75: ...Installation RT SVX24J EN 75 Figure 51 Hot water coil piping Figure 52 Steam coil piping ...
Страница 87: ...Installation RT SVX24J EN 87 Figure 57 Typical field wiring diagram for 90 to 162 ton CV control options ...
Страница 89: ...Installation RT SVX24J EN 89 Figure 59 Typical field wiring diagram for 90 to 162 ton VAV control options ...