Gas Pipe Sizing Tables - Navien NHB Series Installation & Operation Manual
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4.1 Gas Pipe Sizing Tables
The following tables are referenced from 2012 National Fuel Gas Code for reference only. Please consult the gas pipe manufacturer for actual
pipe capacities.
Maximum Natural Gas Delivery Capacity
In Cubic Feet (ft
3
) per Hour (0.60 Specific Gravity; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft
simplified calculations. This table is recommended for supply pressures less than 6 in WC.
Length (including fittings)
Pipe Size
10 ft
20 ft
(3 m)
(6 m)
3
/
in
360
247
4
1 in
678
466
1
1
/
in
1,390
957
4
1
1
/
in
2,090
1,430
2
2 in
4,020
2,760
2
1
/
in
6,400
4,400
2
3 in
11,300
7,780
4 in
23,100
15,900
3
In Cubic Feet (ft
) per Hour (0.60 Specific Gravity; 3.0 in WC Pressure Drop). Contact your gas supplier for BTU/ft
simplified calculations. This table is recommended for supply pressures of 6 in WC or greater.
Length (including fittings)
Pipe Size
10 ft
20 ft
(3 m)
(6 m)
3
/
in
949
652
4
1 in
1,787
1,228
1
1
/
in
3,669
2,522
4
1
1
/
in
5,497
3,778
2
2 in
10,588
7,277
2
1
/
in
16,875
11,598
2
3 in
29,832
20,503
4 in
43,678
30,020
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
30 ft
40 ft
50 ft
(9 m)
(12 m)
(15 m)
524
448
397
986
844
748
2,025
1,733
1,536
3,034
2,597
2,302
5,844
5,001
4,433
9,314
7,971
7,065
16,465
14,092
12,489
24,107
20,632
18,286
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)
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
11,316
10,411
9,685
16,569
15,243
14,181
3
ratings. Use 1,000 BTU/ft
3
for
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
3
ratings. Use 1,000 BTU/ft
for
90 ft
100 ft
125 ft
(27 m)
(30 m)
(38 m)
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
13,305
12,568
11,139
Connecting the Gas Supply
49
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