DuoPEX Gas
Sizing Tables

The DuoPEX Gas pipe and fitting system is designed to make every job quick and easy. It provides a revolutionary alternative for the professional plumber and gas fitter.

Pipe Sizing

Pipe Sizing

The following example is for natural gas using:

  • Supply Pressure 2.75kPa
  • Pressure Drop 0.75kPa
Pipe Section A→D A→B B→C C→D C→E B→F*
Pipe
Length		 20 5 5 10 4 4
Gas Flow
MJ/h		 325 190
+ 80
+ 55
= 325		 80
+ 55
= 135		 55 80 190
Fitting
Correction		 0.8
+ 1.5
+ 1.7
= 4m
Corrected
Index Run		 24m 24m 24m 24m 24m 24m
Nominal
Pipe Size
Corrected		 32mm 20mm 16mm 20mm 26mm*
Nominal
Pipe Size
Uncorrected		 26mm 20mm 16mm 16mm 20mm

* In keeping with gasfitting best practice, this run has been upsized.

LPG

LPG

Pressure Drop 0.25kPa (Pressure Supply 2.75kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 285 621 1139 2321 4434 8887 16877
4 192 418 766 1562 2984 5981 11358
6 152 332 608 1239 2367 4744 9009
8 129 281 516 1051 2008 4025 7643
10 113 248 454 925 1768 3543 6729
12 102 223 409 834 1593 3192 6062
14 94 204 375 764 1458 2923 5551
16 87 189 347 707 1351 2709 5143
18 81 177 325 662 1264 2532 4809
20 76 167 306 623 1190 2385 4529
25 67 147 269 548 1047 2099 3986
30 61 132 242 494 943 1891 3591
35 55 121 222 452 864 1732 3289
40 51 112 206 419 801 1605 3047
45 48 105 192 392 749 1500 2849
50 45 99 181 369 705 1413 2683
55 43 94 171 349 667 1338 2540
60 41 89 163 332 635 1273 2417
65 39 85 156 318 607 1216 2309
70 37 81 149 304 581 1165 2213
75 36 78 144 293 559 1120 2128
80 35 76 138 282 539 1080 2051
85 33 73 134 272 520 1043 1981
90 32 71 129 264 504 1010 1917
95 31 68 125 256 488 979 1859
100 30 66 122 248 474 951 1805
120 27 60 110 224 428 857 1626
140 25 55 101 205 391 785 1490
160 23 51 93 190 363 727 1380
180 22 48 87 177 339 679 1290
200 20 45 82 167 319 640 1215
250 18 39 72 147 281 563 1069
300 16 35 65 133 253 508 964
Correction
+ mt for fitting		 1.7 1.5 0.8 0.7 N/A N/A N/A
Pressure Drop 10kPa (Pressure Supply 70kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 2411 5263 9644 19003 36297 72255 133400
4 1622 3542 6490 12788 24426 48625 89772
6 1287 2809 5148 10144 19375 38569 71207
8 1092 2383 4368 8606 16437 32722 60412
10 961 2098 3845 7576 14470 28805 53180
12 866 1891 3464 6826 13038 25955 47918
14 793 1731 3172 6251 11939 23766 43878
16 735 1604 2939 5791 11062 22020 40654
18 687 1500 2748 5414 10342 20587 38008
20 647 1412 2587 5098 9737 19384 35787
25 569 1243 2278 4488 8572 17063 31503
30 513 1120 2052 4044 7724 15375 28386
35 470 1025 1879 3703 7072 14079 25993
40 435 950 1741 3431 6553 13045 24083
45 407 888 1628 3207 6126 12195 22516
50 383 836 1533 3020 5768 11483 21200
55 363 792 1451 2860 5463 10874 20076
60 345 754 1381 2721 5198 10347 19102
65 330 720 1319 2600 4965 9884 18248
70 316 690 1265 2492 4759 9474 17492
75 304 663 1216 2396 4576 9108 16816
80 293 639 1172 2309 4410 8779 16207
85 283 618 1132 2230 4260 8480 15656
90 274 598 1095 2159 4123 8207 15153
95 265 580 1062 2093 3997 7958 14691
100 258 563 1031 2032 3882 7728 14267
120 232 507 929 1831 3498 6963 12855
140 213 464 851 1677 3203 6376 11771
160 197 430 788 1554 2967 5907 10906
180 184 402 737 1453 2774 5523 10196
200 174 379 694 1368 2612 5200 9601
250 153 333 611 1204 2300 4578 8452
300 138 300 551 1085 2072 4125 7615
Correction
+ mt for fitting		 N/A N/A N/A N/A N/A N/A N/A

Natural Gas

Natural Gas

Pressure Drop 0.075kPa (Meter Pressure 1.1kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 90 196 359 731 1397 2687 5316
4 60 132 241 492 940 1809 3577
6 48 104 191 390 745 1435 2838
8 41 89 162 331 632 1217 2407
10 36 78 143 292 557 1071 2119
12 32 70 129 263 502 965 1910
14 30 64 118 240 459 884 1749
16 27 60 109 223 426 819 1620
18 26 56 102 208 398 766 1515
20 24 53 96 196 375 721 1426
25 21 46 85 173 330 635 1256
30 19 42 76 156 297 572 1131
35 17 38 70 143 272 524 1036
40 16 35 65 132 252 485 960
45 15 33 61 123 236 454 897
50 14 31 57 116 222 427 845
55 13 29 54 110 210 405 800
60 13 28 51 105 200 385 761
65 12 27 49 100 191 368 727
70 12 26 47 96 183 352 697
75 11 25 45 92 176 339 670
80 11 24 44 89 170 327 646
85 11 23 42 86 164 315 624
90 10 22 41 83 159 305 604
95 10 22 40 81 154 296 585
100 10 21 38 78 149 287 569
120 9 19 35 71 135 259 513
140 8 17 32 65 123 237 469
160 7 16 29 60 114 220 435
180 7 15 27 56 107 205 406
200 6 14 26 53 101 193 383
250 6 12 23 46 88 170 337
300 5 11 20 42 80 154 304
Correction
+ mt for fitting		 1.2 1.1 0.6 0.5 N/A N/A N/A
Pressure Drop 0.75kPa (Meter Pressure 2.75kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 322 702 1287 2624 5011 9643 19075
4 217 473 866 1766 3372 6490 12837
6 172 375 687 1400 2675 5147 10182
8 146 318 583 1188 2269 4367 8639
10 128 280 513 1046 1998 3844 7604
12 116 252 462 942 1800 3464 6852
14 106 231 423 863 1648 3172 6274
16 98 214 392 800 1527 2939 5813
18 92 200 367 748 1428 2748 5435
20 86 188 345 704 1344 2587 5117
25 76 166 304 620 1184 2278 4505
30 68 149 274 558 1066 2052 4059
35 63 137 251 511 976 1879 3717
40 58 127 232 474 905 1741 3444
45 54 119 217 443 846 1628 3220
50 51 112 205 417 796 1533 3032
55 48 106 194 395 754 1451 2871
60 46 101 184 376 718 1381 2732
65 44 96 176 359 686 1319 2610
70 42 92 169 344 657 1265 2501
75 41 89 162 331 632 1216 2405
80 39 85 156 319 609 1172 2318
85 38 82 151 308 588 1132 2239
90 37 80 146 298 569 1095 2167
95 35 77 142 289 552 1062 2101
100 34 75 138 281 536 1031 2040
120 31 68 124 253 483 929 1838
140 28 62 114 232 442 851 1683
160 26 57 105 215 410 788 1560
180 25 54 98 201 383 737 1458
200 23 51 93 189 361 694 1373
250 20 45 82 166 318 611 1209
300 18 40 74 150 286 550 1089
Correction
+ mt for fitting		 1.7 1.5 0.8 0.7 N/A N/A N/A
Pressure Drop 1.5kPa (Meter Pressure 2.75kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 531 1160 2125 4332 8274 14330 27716
4 357 780 1430 2915 5568 9643 18652
6 284 619 1134 2312 4417 7649 14795
8 241 525 962 1962 3747 6490 12552
10 212 462 847 1727 3298 5713 11049
12 191 417 763 1556 2972 5147 9956
14 175 381 699 1425 2722 4713 9116
16 162 353 648 1320 2522 4367 8447
18 151 330 606 1234 2357 4083 7897
20 143 311 570 1162 2220 3844 7435
25 125 274 502 1023 1954 3384 6545
30 113 247 452 922 1761 3049 5898
35 104 226 414 844 1612 2792 5400
40 96 209 384 782 1494 2587 5004
45 90 196 359 731 1397 2419 4678
50 84 184 338 688 1315 2277 4405
55 80 175 320 652 1245 2157 4171
60 76 166 304 620 1185 2052 3969
65 73 159 291 593 1132 1960 3791
70 70 152 279 568 1085 1879 3635
75 67 146 268 546 1043 1806 3494
80 65 141 258 526 1005 1741 3367
85 62 136 249 508 971 1682 3253
90 60 132 241 492 940 1628 3148
95 59 128 234 477 911 1578 3052
100 57 124 227 463 885 1533 2964
120 51 112 205 417 797 1381 2671
140 47 102 188 382 730 1264 2446
160 43 95 174 354 676 1172 2266
180 41 89 162 331 632 1095 2119
200 38 83 153 312 596 1032 1995
250 34 73 135 274 524 908 1756
300 30 66 121 247 472 818 1582
Correction
+ mt for fitting		 1.7 1.5 0.8 0.7 N/A N/A N/A
Pressure Drop 1.5kPa (Meter Pressure 5-10kPa)
Straight Pipe Length (m) 16mm 20mm 26mm 32mm 40mm 50mm 63mm
2 487 1062 1947 3968 7406 14087 27865
4 327 715 1310 2670 4984 9480 18752
6 260 567 1039 2118 3953 7519 14874
8 220 481 882 1797 3354 6379 12619
10 194 423 776 1582 2953 5616 11108
12 175 382 699 1425 2660 5060 10009
14 160 349 640 1305 2436 4633 9165
16 148 324 593 1209 2257 4293 8492
18 139 303 555 1130 2110 4014 7939
20 131 285 522 1064 1987 3779 7475
25 115 251 460 937 1749 3327 6580
30 104 226 414 844 1576 2997 5929
35 95 207 379 773 1443 2745 5429
40 88 192 351 716 1337 2543 5031
45 82 179 329 670 1250 2378 4703
50 77 169 309 631 1177 2239 4428
55 73 160 293 597 1115 2120 4194
60 70 152 279 568 1061 2017 3990
65 67 145 266 543 1013 1927 3812
70 64 139 255 520 971 1847 3654
75 61 134 245 500 934 1776 3513
80 59 129 237 482 900 1711 3385
85 57 125 228 466 869 1653 3270
90 55 121 221 451 841 1600 3165
95 54 117 214 437 816 1551 3069
100 52 114 208 424 792 1507 2980
120 47 102 188 382 714 1357 2685
140 43 94 172 350 654 1243 2459
160 40 87 159 324 606 1152 2278
180 37 81 149 303 566 1077 2130
200 35 76 140 286 533 1014 2005
250 31 67 123 251 469 892 1765
300 28 61 111 227 423 804 1591
Correction
+ mt for fitting		 1.7 1.5 0.8 0.7 N/A N/A N/A
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