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INSTALLATION - GAS CONNECTIONS
Table 13.1 - Gas Pipe Capacities - Natural Gas j
Capacity in MBH by Nominal Pipe Diameter
Pipe
Length (ft)
1∕2"
3∕4"
1"
10
138
287
540
20
95
197
371
30
76
159
298
40
65
135
255
50
58
120
226
60
53
109
205
70
48
100
188
80
44
93
175
90
42
87
165
100
40
83
155
125
35
74
138
150
32
66
125
175
29
61
114
200
27
57
107
250
24
50
95
Gas pipe capacities based on Table 6.2.1(a) of NFPA 54 for schedule 40
metallic pipe with inlet pressure less than 2 psi, with a pressure drop of 0.3"
w.c. and gas specific gravity of 0.60.
Table 13.2 - Gas Pipe Capacities - Propane Gas k
Capacity in MBH by Nominal Pipe Diameter
Pipe
Length (ft)
1∕2"
3∕4"
1"
10
291
608
1,150 2,350 3,520 6,790 10,800 19,100
20
200
418
787
30
160
336
632
40
137
287
541
50
122
255
480
60
110
231
434
80
101
212
400
100
94
197
372
125
89
185
349
150
84
175
330
175
74
155
292
200
67
140
265
250
62
129
243
‚ Gas pipe capacities based on Table 6.3.1(d) of NFPA 54 for schedule 40
metallic pipe with inlet pressure of 11.0" w.c., with a pressure drop of 0.5" w.c.
and gas specific gravity of 1.50.
1 1∕4" 1 1∕2"
2"
2 1∕2"
1,113 1,659 3,203 5,103 9,009
762
1,145 2,195 3,507 6,195
612
917
1,764 2,814 4,977
524
784
1,512 2,405 4,253
464
695
1,344 2,132 3,770
420
630
1,218 1,932 3,423
386
580
1,113 1,775 3,150
360
540
1,038 1,659 2,930
338
506
974
1,554 2,741
319
478
921
1,470 2,594
282
423
816
1,302 2,300
256
384
739
1,176 2,079
235
353
680
1,082 1,911
219
329
632
1,008 1,785
194
291
561
894
1,575
1 1∕4" 1 1∕2"
2"
2 1∕2"
1,620 2,420 4,660 7,430 13,100
1,300 1,940 3,750 5,970 10,600
1,110 1,660 3,210 5,110 9,030
985
1,480 2,840 4,530 8,000
892
1,340 2,570 4,100 7,250
821
1,230 2,370 3,770 6,670
763
1,140 2,200 3,510 6,210
716
1,070 2,070 3,290 5,820
677
1,010 1,950 3,110 5,500
600
899
1,730 2,760 4,880
543
814
1,570 2,500 4,420
500
749
1,440 2,300 4,060
Table 13.3 - Burner Orifice Sizing and Gas Consumption
Model
3"
Size
Cfh
75
Orifice Drill Size
Cfh
100
Orifice Drill Size
Cfh
125
Orifice Drill Size
Cfh
150
Orifice Drill Size
Cfh
175
Orifice Drill Size
Cfh
200
Orifice Drill Size
Cfh
225
Orifice Drill Size
Cfh
250
Orifice Drill Size
Cfh
300
Orifice Drill Size
Cfh
350
Orifice Drill Size
Cfh
400
Orifice Drill Size
3"
Cfh
500
Orifice Drill Size
l
Cfh
600
Orifice Drill Size
l
Cfh
700
l
Orifice Drill Size
Cfh
800
l
Orifice Drill Size
Cfh
840
m
Orifice Drill Size
Cfh
960
m
Orifice Drill Size
jBased on natural gas properties of 1050 Btu/ft³ and specific gravity of 0.60.
kBased on propane gas properties of 2500 Btu/ft³ and specific gravity of 1.50.
lModel sizes 500-800 contain 2 furnaces. Values shown are per furnace.
mModel sizes 840-960 contain 3 furnaces. Values shown are per furnace.
5-594.10
Gas Type
Natural j
Propane k
72.1
30.0
20
39
96.1
40.0
30
45
120.2
50.0
25
42
144.2
60.0
30
45
168.3
70.0
27
43
192.3
80.0
23
42
216.3
90.0
20
39
240.4
100.0
25
42
288.7
120.0
20
39
336.5
140.0
27
43
384.6
160.0
23
42
240.4
100.0
25
42
288.7
120.0
20
39
336.5
140.0
27
43
384.6
160.0
23
42
336.5
140.0
27
43
384.6
160.0
23
42
Orifice
Qty
1
2
2
3
3
3
3
4
4
6
6
4
4
6
6
6
6
13
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