Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-24
Table B2-19. Gas line capacity - Schedule 40 metallic pipe
Pipe Size
Nominal
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
Actual I.D.
0.622
0.824
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
2,350
4,920
9,270
19,000
28,500
54,900
87,500
155,000
316,000
20
1,620
3,380
6,370
13,100
19,600
37,700
60,100
106,000
217,000
30
1,300
2,720
5,110
10,500
15,700
30,300
48,300
85,400
174,000
40
1,110
2,320
4,380
8,990
13,500
25,900
41,300
75,100
149,000
50
985
2,060
3,880
7,970
11,900
23,000
36,600
64,800
132,000
60
892
1,870
3,520
7,220
10,300
20,300
33,200
58,700
120,000
70
821
1,720
3,230
6,640
9,950
19,200
30,500
54,000
110,000
80
764
1,600
3,010
6,180
9,260
17,800
28,400
50,200
102,000
90
717
1,500
2,820
5,800
8,680
16,700
26,700
47,100
96,100
100
677
1,420
2,670
5,470
8,200
15,800
25,200
44,500
90,300
125
600
1,250
2,360
4,850
7,270
14,000
22,300
39,500
80,500
150
544
1,140
2,140
4,400
6,590
12,700
20,200
35,700
72,900
175
500
1,050
1,970
4,040
6,060
11,700
18,600
32,900
67,100
200
465
973
1,830
3,760
5,640
10,900
17,300
30,600
62,400
500
283
593
1,120
2,290
3,430
6,610
10,300
18,600
38,000
1000
195
407
897
1,380
2,360
4,550
7,240
12,000
26,100
1500
156
327
616
1,270
1,900
3,650
5,820
10,300
21,000
**Fuel: Natural Gas
**Inlet Pressure: 3.0 psi
**Pressure Drop: 2.0 psi
**Specific Gravity: 0.60
