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FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop
of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Nominal
Iron
Pipe
Internal
Size,
Diameter
inches inches
10
1/4
0.364
32
3/8
0.493
72
1/2
0.622
132
3/4
0.824
278
1
1.049
520
1 1/4
1.380
1050
1 1/2
1.610
1600
2
2.067
3050
2 1/2
2.469
4800
3
3.068
8500
4
4.026
17,500 12,000 9,700 8,300
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per
Hour of Undiluted Petroleum Gases (at 11 inches
Water Column Inlet Pressure) (Based on a Pressure
Drop of 0.5 Inch Water Column).
Maximum Capacity of Semi-Rigid (flexible, non
corrugated) Tubing in Thousands of BTU per Hour
of Undiluted Liquefied Petroleum Gases (at 11
inches Water Column Inlet Pressure).
(Based on a Pressure Drop of 0.5 Inch Water
Column)
* Source National Fuel Gas Code NFPA 54, ANSI
Z223. 1 - No Additional Allowance is necessary for an
ordinary number of fittings
Fig. 22
16
Length of Black Iron Pipe, Feet
20
30
40
50
22
18
15
14
49
40
34
30
92
73
63
56
190
152
130
115
350
285
245
215
730
590
500
440
1100
890
760
670
2100
1650 1450
1270 1150 1050
3300
2700 2300
2000 1850 1700 1600 1500 1400 1250
5900
4700 4100
3600 3250 3000 2800 2600 2500 2200
7,400 6,80 6,200 5,800 5,400 5,100 4,500
Nominal
Iron Pipe
Size,
Inches
Outside
Diameter,
Inch
Follow boxed numbers for piping just one 250 SX
(example: ¾" B.I. Natural Gas pipe for 20 ft (6. 1 m).
will handle 190,000 btu's (55.7 kWh). For multiple
appliances combine the total btu input load and then
refer to applicable chart below.
60
70
80
90
12
11
11
10
27
25
23
22
50
46
43
40
105
96
90
84
195
180
170
160
400
370
350
320
610
560
530
490
990
930
Black Iron Pipe
Length of Pipe, Feet
10
20
30
40
50
1/2
275 189 152
129 114 103 96
3/4
567 693 315
267 237 217 196 185 173 162
1
107 732 590
504 448 409 378 346 322 307
1 1/4 220 149 121
103 913 834 771 724 677 630
1 1/2 330 229 185
155 141 127 118 108 102 976
2
622 433 346
299 264 239 220 204 192 1811 1606 1496
Copper
Length of Tubing, Feet
10
20
30
40
3/8
39
26
21
19
1/2
92
62
50
41
5/8
199 131
107
90
3/4
329 216
181 145 131
7/8
501 346
277 233 198
100
125
150
175
9
8
8
7
21
18
17
15
38
34
31
28
79
72
64
59
150
130
120
110
305
275
250
225
460
410
380
350
870
780
710
650
1130 1050
2000 1850 1700
4,100 3,800 3500
60
70
80
90
100
125
89
83
78
69
146
275
567
866
50
60
70
80
90 100
_
_
_
_
_
_
37
35
31
29
27
26
79
72
67
62
59
55
121 112 104 95
90
187 164 155 146 138
6 720 607 057
200
6
14
26
55
100
210
320
610
980
150
63
132
252
511
787
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