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4.1 Gas Pipe Sizing Tables
The following tables are referenced from the 2021 National Fuel Gas Code and are for reference only. Please
consult the gas pipe manufacturer for actual pipe capacities.
Maximum Natural Gas Delivery Capacity
In Cubic Feet (ft
) per Hour (0.60 Specific Gravity; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft
3
Use 1,000 BTU/ft
for simplified calculations. This table is recommended for supply pressures less than 6 in WC.
3
Length (including fittings)
Pipe
10 ft
20 ft
Size
(3 m)
(6 m)
/
in
360
247
3
4
1 in
678
466
1
/
in
1,390
957
1
4
1
/
in
2,090
1,430
1
2
2 in
4,020
2,760
2
/
in
6,400
4,400
1
2
3 in
11,300
7,780
4 in
23,100
15,900
In Cubic Feet (ft
) per Hour (0.60 Specific Gravity; 3.0 in WC Pressure Drop). Contact your gas supplier for BTU/ft
3
ratings. Use 1,000 BTU/ft
3
greater.
Length (including fittings)
Pipe
20 ft
10 ft
Size
(3 m)
(6 m)
/
in
454
312
1
2
/
in
949
652
3
4
1 in
1,790
1,230
1
/
in
3,670
2,520
1
4
1
/
in
5,500
3,780
1
2
2 in
10,600 7,280
2
/
in
16,900 11,600 9,310
1
2
3 in
29,800 20,500 16,500 14,100 12,500 11,300 10,400 9,690
4 in
60,800 41,800 33,600 28,700 25,500 23,100 21,200 19,800 18,500 17,500 15,500
30 ft
40 ft
50 ft
(9 m)
(12 m)
(15 m)
199
170
151
374
320
284
768
657
583
1,150
985
873
2,220
1,900
1,680
3,530
3,020
2,680
6,250
5,350
4,740
12,700
10,900
9,660
for simplified calculations. This table is recommended for supply pressures of 6 in WC or
30 ft
40 ft
50 ft
(9 m)
(12 m)
(15 m)
250
214
190
524
448
397
986
844
748
2,030
1,730
1,540
3,030
2,600
2,300
5,840
5,000
4,430
7,970
7,060
60 ft
70 ft
80 ft
(18 m)
(21 m)
(24 m)
137
126
117
257
237
220
528
486
452
791
728
677
1,520
1,400
1,300
2,430
2,230
2,080
4,290
3,950
3,670
8,760
8,050
7,490
60 ft
70 ft
80 ft
(18 m)
(21 m)
(24 m)
172
158
147
360
331
308
678
624
580
1,390
1,280
1,190
2,090
1,920
1,790
4,020
3,690
3,440
6,400
5,890
5,480
ratings.
3
90 ft
100 ft
125 ft
(27 m)
(30 m)
(38 m)
110
104
92
207
195
173
424
400
355
635
600
532
1,220
1,160
1,020
1,950
1,840
1,630
3,450
3,260
2,890
7,030
6,640
5,890
3
90 ft
100 ft
125 ft
(27 m)
(30 m)
(38 m)
138
131
116
289
273
242
544
514
456
1,120
1,060
936
1,670
1,580
1,400
3,230
3,050
2,700
5,140
4,860
4,300
9,090
8,580
7,610
Connecting the Gas Supply
49
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