Noritz GHQ-C2801WX-FF US, Installation Manual, Page: 39 / 84

39
[Gas pipe sizing tables]
• These tables are for reference only. Consult gas pipe manufacturer for actual pipe capacities.
• It is an example of Schedule 40 Metallic Pipe.
• (Only Table 1 - 4)
Values in Table are in ft 3 of Gas per Hour. Contact your gas supplier for Btu/ft 3 ratings. For simplification
of your calculations, 1 ft 3 of Gas is approximately equivalent to 1,000 Btu.
1. Maximum Natural Gas Delivery Capacity (For Less than 6 in. W.C. initial supply pressure)
0.5 in. W.C. Pressure Drop
Pipe Size
Length (including fittings)
10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 125 ft 150 ft 175 ft 200 ft
(3 m) (6 m) (9 m) (12 m) (15 m) (18 m) (21 m) (24 m) (27 m) (30 m) (38 m) (45 m) (53 m) (60 m)
1/2 in. 172 118 95 81 72 65 60 56 52 50 44 40 37 34
3/4 in. 360 247 199 170 151 137 126 117 110 104 92 83 77 71
1 in. 678 466 374 320 284 257 237 220 207 195 173 157 144 134
1 1/4 in. 1,390 957 768 657 583 528 486 452 424 400 355 322 296 275
1 1/2 in. 2,090 1,430 1,150 985 873 791 728 677 635 600 532 482 443 412
2 in. 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020 928 854 794
2 1/2 in. 6,400 4,400 3,530 3,020 2,680 2,430 2,230 2,080 1,950 1,840 1,630 1,480 1,360 1,270
2. Maximum Natural Gas Delivery Capacity (For 6 - 7 in. W.C. initial supply pressure)
1.0 in. W.C. Pressure Drop
Pipe Size
Length (including fittings)
10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 125 ft 150 ft 175 ft 200 ft
(3 m) (6 m) (9 m) (12 m) (15 m) (18 m) (21 m) (24 m) (27 m) (30 m) (38 m) (45 m) (53 m) (60 m)
1/2 in. 250 172 138 118 105 95 87 81 76 72 64 58 53 50
3/4 in. 524 360 289 247 219 199 183 170 160 151 134 121 111 104
1 in. 986 678 544 466 413 374 344 320 300 284 252 228 210 195
1 1/4 in. 2,030 1,390 1,120 957 848 768 707 657 617 583 516 468 430 400
1 1/2 in. 3,030 2,090 1,680 1,430 1,270 1,150 1,060 985 924 873 774 701 645 600
2 in. 5,840 4,020 3,230 2,760 2,450 2,220 2,040 1,900 1,780 1,680 1,490 1,350 1,240 1,160
2 1/2 in. 9,310 6,400 5,140 4,400 3,900 3,530 3,250 3,020 2,840 2,680 2,380 2,150 1,980 1,840
3. Maximum Natural Gas Delivery Capacity (For 7 - 8 in. W.C. initial supply pressure)
2.0 in. W.C. Pressure Drop
Pipe Size
Length (including fittings)
10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 125 ft 150 ft 175 ft 200 ft
(3 m) (6 m) (9 m) (12 m) (15 m) (18 m) (21 m) (24 m) (27 m) (30 m) (38 m) (45 m) (53 m) (60 m)
1/2 in. 364 250 201 172 153 138 127 118 111 105 93 84 77 72
3/4 in. 762 524 420 360 319 289 266 247 232 219 194 176 162 151
1 in. 1,440 986 792 678 601 544 501 466 437 413 366 332 305 284
1 1/4 in. 2,950 2,030 1,630 1,390 1,230 1,120 1,030 957 898 848 751 681 626 583
1 1/2 in. 4,420 3,030 2,440 2,090 1,850 1,680 1,540 1,430 1,350 1,270 1,130 1,020 938 873
2 in. 8,500 5,840 4,690 4,020 3,560 3,230 2,970 2,760 2,590 2,450 2,170 1,970 1,810 1,680
2 1/2 in. 13,600 9,310 7,480 6,400 5,670 5,140 4,730 4,400 4,130 3,900 3,460 3,130 2,880 2,680
4. Maximum Natural Gas Delivery Capacity (For 8 - 10.5 in. W.C. initial supply pressure)
3.0 in. W.C. Pressure Drop
Pipe Size
Length (including fittings)
10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 125 ft 150 ft 175 ft 200 ft
(3 m) (6 m) (9 m) (12 m) (15 m) (18 m) (21 m) (24 m) (27 m) (30 m) (38 m) (45 m) (53 m) (60 m)
1/2 in. 454 312 250 214 190 172 158 147 138 131 116 105 96 90
3/4 in. 949 652 524 448 397 360 331 308 289 273 242 219 202 188
1 in. 1,790 1,230 986 844 748 678 624 580 544 514 456 413 380 353
1 1/4 in. 3,670 2,520 2,030 1,730 1,540 1,390 1,280 1,190 1,120 1,060 936 848 780 726
1 1/2 in. 5,500 3,780 3,030 2,600 2,300 2,090 1,920 1,790 1,680 1,580 1,400 1,270 1,170 1,090
2 in. 10,600 7,280 5,840 5,000 4,430 4,020 3,700 3,440 3,230 3,050 2,700 2,450 2,250 2,090
2 1/2 in. 16,900 11,600 9,310 7,970 7,070 6,400 5,890 5,480 5,140 4,860 4,300 3,900 3,590 3,340
5. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of Btu/h
0.5 in. W.C. Pressure Drop
Pipe Size
Length (including fittings)
10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 80 ft 100 ft 125 ft 150 ft 175 ft 200 ft
(3 m) (6 m) (9 m) (12 m) (15 m) (18 m) (24 m) (30 m) (38 m) (45 m) (53 m) (60 m)
1/2 in. 291 200 160 137 122 110 101 94 89 84 74 67
3/4 in. 608 418 336 287 255 231 212 197 185 175 155 140
1 in. 1,150 787 632 541 480 434 400 372 349 330 292 265
1 1/4 in. 2,350 1,620 1,300 1,110 985 892 821 763 716 677 600 543
1 1/2 in. 3,520 2,420 1,940 1,660 1,480 1,340 1,230 1,140 1,070 1,010 899 814
2 in. 6,790 4,660 3,750 3,210 2,840 2,570 2,370 2,200 2,070 1,950 1,730 1,570
Connecting the Gas Supply