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

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.

Natural Gas

Pressure drop 0.075 (Meter Pressure 1.1kPa)

Length of straight pipe in metres

Nominal
Size
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 Correction
(+ mt for fitting)
16mm 74 58 47 39 1.2
20mm 155 132 103 87 78 70 62 58 54 50 47 41 38 1.1
26mm 303 241 194 163 140 128 116 109 103 97 85 78 70 64 60 58 54 50 0.6
32mm 621 535 388 330 291 264 244 221 213 194 175 155 144 132 124 116 111 101 0.5
40mm 1048 939 745 625 563 504 466 427 407 376 334 295 275 252 233 225 213 198 N/A
50mm 2018 1785 1436 1242 1086 970 892 834 776 737 660 582 543 485 466 446 435 388 N/A
63mm 3880 3492 2755 2328 2056 1862 1746 1591 1513 1397 1242 1125 1048 931 892 854 815 757 N/A
Pressure drop 0.75 (Meter Pressure 2.75kPa)

Length of straight pipe in metres

Nominal
Size
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 Correction
(+ mt for fitting)
16mm 283 217 175 147 132 116 107 99 91 87 78 70 64 58 54 50 49 47 1.7
20mm 621 469 388 326 287 252 237 217 202 190 171 151 147 132 120 113 107 105 1.5
26mm 1125 873 698 601 524 466 431 396 369 353 310 279 256 241 221 213 198 190 0.8
32mm 2250 1746 1436 1183 1067 951 892 815 757 718 640 582 524 485 462 427 407 388 0.7
40mm 4268 3298 2716 2309 2018 1785 1649 1552 1436 1358 1187 1086 1009 931 873 815 776 737 N/A
50mm 8148 6402 5083 4346 3647 3298 3182 2910 2716 2600 2328 2095 1940 1785 1668 1571 1474 1397 N/A
63mm 15908 12416 10088 8536 7372 6596 6208 5820 5354 5044 4462 4074 3725 3453 3182 2988 2910 2716 N/A
Pressure drop 1.5kPa
Flow through PE-X / AL / PE-X pipe crimp fittings (MJ/h)

Length of straight pipe in metres

Nominal
Size
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 Correction
(+ mt for fitting)
16mm 423 330 252 217 194 175 163 147 140 128 113 101 93 85 81 78 74 66 1.7
20mm 931 737 563 485 427 380 357 326 303 279 252 225 210 190 182 171 159 151 1.5
26mm 1630 1319 1028 892 776 698 660 601 563 524 466 419 388 349 341 310 295 279 0.8
32mm 3298 2600 2056 1824 1552 1397 1319 1203 1125 1048 931 854 776 718 660 640 601 582 0.7
40mm 6208 5044 3880 3414 2910 2600 2483 2250 2134 1959 1785 1591 1474 1358 1319 1203 1125 1086 N/A
50mm 11834 9506 7062 6596 5626 5122 4734 4268 4074 3764 3182 2871 2794 2406 2328 2250 2212 1940 N/A
63mm 23086 18624 14744 12804 10864 10088 9312 8536 7760 7372 6596 5820 5432 5354 4734 4462 4268 3880 N/A

This table is suitable for supply pressures within the range 5-10 kPa.
Technical Regulators requirements may vary in different states and territories.

Natural Gas

Pressure Drop 0.25kPa (Pressure Supply 2.75kPa)
Flow through PE-X/AL/PE-X pipe crimp fittings (MJ/h)

Length of straight pipe in metres

Nominal
Size
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 Correction
(+ mt for fitting)
16mm 238 190 152 128 114 100 95 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 1.7
20mm 532 418 333 285 247 219 204 190 166 169 147 133 119 114 105 100 95 N/A 1.5
26mm 998 760 618 523 447 418 380 352 323 314 276 247 223 209 190 181 171 166 0.8
32mm 1995 1530 1235 1045 922 855 760 713 665 627 561 494 447 428 399 380 352 342 0.7
40mm 3800 2945 2375 2043 1805 1615 1473 1378 1283 1235 1055 950 874 808 760 713 665 646 N/A
50mm 7220 5605 4560 3895 3420 3040 2850 2660 2470 2375 2090 1881 1710 1615 1568 1425 1330 1245 N/A
63mm 13300 10925 8930 7600 6650 5890 5605 5130 4750 4655 3990 3610 3230 3040 2850 2755 2565 2470 N/A
Pressure Drop 10kPa (Pressure Supply 70kPa)
Flow through PE-X/AL/PE-X pipe crimp fittings (MJ/h)

Length of straight pipe in metres

Nominal
Size
2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60
16mm 2090 1615 1292 1064 950 855 798 732 684 627 570 513 475 428 409 390 361 342
20mm 4180 3420 2850 2375 2090 1900 1663 1615 1520 1425 1235 1140 1045 950 903 855 798 760
26mm 7600 6175 5130 4275 3800 3420 3135 2850 2755 2565 2280 2090 1900 1805 1663 1615 1473 1425
32mm 16150 12350 10450 8550 7600 6745 6270 5700 5510 5130 4560 3990 3800 3515 3325 3135 2945 2850
40mm 29450 23750 19760 16150 14250 12825 12065 11115 10450 9500 8550 7790 7125 6650 6175 5890 5605 5320
50mm 52250 45600 38000 30875 27550 24700 22800 20900 19950 18525 16625 16150 13775 12825 11875 11400 10545 10260
63mm 99750 87780 72200 60800 55100 47500 44175 41800 38000 36100 32300 28975 27075 24700 23275 22325 20900 19950