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4.1 Gas Pipe Sizing Tables
The following tables are referenced from the 2012 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
1,787
1,228
1
/
in
3,669
2,522
1
4
1
/
in
5,497
3,778
1
2
2 in
10,588 7,277
2
/
in
16,875 11,598 9,314
1
2
3 in
29,832 20,503 16,465 14,092 12,489 11,316 10,411 9,685
4 in
43,678 30,020 24,107 20,632 18,286 16,569 15,243 14,181 13,305 12,568 11,139
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
2,025
1,733
1,536
3,034
2,597
2,302
5,844
5,001
4,433
7,971
7,065
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
1,392
1,280
1,191
2,085
1,919
1,785
4,016
3,695
3,437
6,401
5,889
5,479
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
1,118
1,056
936
1,675
1,582
1,402
3,225
3,046
2,700
5,140
4,856
4,303
9,087
8,584
7,608
Connecting the Gas Supply
51
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