Gas Pipe Sizing Tables - Navien NCB-190/060H Installation & Operation Manual

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
ratings. Use 1,000 BTU/ft
3
in WC.
Length (including fittings)
Pipe Size
10 ft 20 ft
(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 12,700 10,900 9,660
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 Size
10 ft 20 ft
(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
54 Connecting the Gas Supply
for simplified calculations. This table is recommended for supply pressures less than 6
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
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
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