Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-22
Table B2-16. Gas line capacity - Schedule 40 metallic pipe
Pipe Size
Nominal
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
Actual I.D.
1.049
1.380"
1.610"
2.067"
2.469"
3.068"
4.026"
Length in feet
**Maximum Capacity in Cubic Feet of Gas per Hour (cfh)
10
514
1,060
1,580
3,050
4,860
8,580
17,500
20
363
726
1,090
2,090
3,340
5,900
12,000
30
284
583
873
1,680
2,680
4,740
9,660
40
243
499
747
1,440
2,290
4,050
8,290
50
215
442
662
1,280
2,030
3,590
7,330
60
195
400
600
1,160
1,840
3,260
6,640
70
179
368
552
1,060
1,690
3,000
6,110
80
167
343
514
989
1,580
2,790
5,680
90
157
322
482
928
1,480
2,610
5,330
100
148
304
455
877
1,400
2,470
5,040
125
131
269
403
777
1,240
2,190
4,460
150
119
244
366
704
1,120
1,980
4,050
175
109
209
336
648
1,030
1,820
3,720
200
102
185
313
602
960
1,700
3,460
**Fuel: Natural Gas
**Inlet Pressure: Less than 2.0 psi
**Pressure Drop: 0.30" w.c.
**Specific Gravity: 0.60
Table B2-17. Gas line capacity - Schedule 40 metallic pipe
Pipe Size
Nominal
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
Actual I.D.
1.049"
1.380"
1.610"
2.067"
2.469"
3.068"
4.026"
Length in feet
**Maximum Capacity in Cubic Feet of Gas per Hour (cfh)
10
678
1,390
2,090
4,020
6,400
11,300
23,100
20
466
957
1,430
2,760
4,400
7,780
15,900
30
374
768
1,150
2,220
3,530
6,250
12,700
40
320
657
985
1,900
3,020
5,350
10,900
50
284
583
873
1,680
2,680
4,740
9,600
60
257
528
791
1,520
2,430
4,290
8,760
70
237
486
728
1,400
2,230
3,950
8,050
80
220
452
677
1,300
2,080
3,670
7,490
90
207
424
635
1,220
1,950
3,450
7,030
100
195
400
600
1,160
1,840
3,260
6,640
125
173
355
532
1,020
1,630
2,890
5,890
150
157
322
482
928
1,480
2,610
5,330
175
144
296
443
854
1,360
2,410
4,910
200
134
275
412
794
1,270
2,240
4,560
**Fuel: Natural Gas
**Inlet Pressure: Less than 2.0 psi
**Pressure Drop: 0.50" w.c.
**Specific Gravity: 0.60
