Navien NPE-180A Service Manual page 26

4.4.1 Gas Pipe Sizing Tables (Referenced from 2012 National Fuel Gas Code)
These tables 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" WC Pressure Drop). Contact your gas supplier for BTU/ft
3
simplified calculations. This table is recommended for supply pressures less than 6" WC.
Length (including fittings)
Pipe Size
10' 20'
(3m) (6m)
3/4" 360 247
1" 678 466
1 1/4" 1,390 957
1 1/2" 2,090 1,430
2" 4,020 2,760
2 1/2" 6,400 4,400
3" 11,300 7,780
4" 23,100 15,900
in Cubic Feet (ft ) per Hour (0.60 Specific Gravity; 3.0" WC Pressure Drop). Contact your gas supplier for BTU/ft
3
simplified calculations. This table is recommended for supply pressures of 6" WC or greater.
Length (including fittings)
Pipe Size
10' 20'
(3m) (6m)
1/2" 454 312
3/4" 949 652
1" 1,787 1,228
1 1/4" 3,669 2,522
1 1/2" 5,497 3,778
2" 10,588 7,277
2 1/2" 16,875 11,598
3" 29,832 20,503
4" 43,678 30,020
30' 40' 50'
(9m) (12m) (15m)
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' 40' 50'
(9m) (12m) (15m)
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
9,314 7,971 7,065
16,465 14,092 12,489
24,107 20,632 18,286
60' 70' 80'
(18m) (21m) (24m)
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' 70' 80'
(18m) (21m) (24m)
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
11,316 10,411 9,685
16,569 15,243 14,181
ratings. Use 1,000 BTU/ft for
3 3
90' 100' 125'
(27m) (30m) (38m)
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
ratings. Use 1,000 BTU/ft for
3 3
90' 100' 125'
(27m) (30m) (38m)
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
13,305 12,568 11,139
System Details 25