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Sizing Steam Pipes (kg/h)

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Steam is a compressible gas where mass flow capacity of pipe lines depends on steam pressures. Steam pipes can be sized with the table and diagram below - pressure in bar, velocity in m/s and capacity in kg/h.

Steam velocities of 25 m/s are in general sufficient for most saturated steam applications.

For full table with larger dimensions - rotate the screen!

Sizing of Steam Pipes
Capacity (kg/h)
Gauge Pressure
(bar)		Steam Velocity
(m/s)		Nominal Pipe Size (mm)
1520253240506580100125150
Innside Diameter (mm)
15.820.926.635.040.952.562.777.9102.3128.2154.1
0.4 15 9 15 24 42 57 95 135 208 359 564 815
25 14 25 41 70 96 158 225 347 598 940 1358
40 23 40 65 112 153 252 360 555 958 1504 2173
0.5 15 9 16 26 45 61 101 144 222 383 602 869
25 15 27 43 75 102 168 240 370 638 1003 1449
40 24 43 69 120 163 269 384 592 1021 1604 2318
0.7 15 10 18 29 51 69 113 162 250 431 676 977
25 17 30 49 84 115 189 270 416 718 1127 1628
40 27 48 78 135 184 302 431 666 1148 1803 2605
0.9 15 11 20 32 56 76 126 179 277 478 750 1084
25 19 33 54 93 127 210 299 462 796 1250 1806
40 30 53 86 149 204 335 478 738 1274 2000 2890
1 15 12 21 34 59 80 132 188 291 501 787 1137
25 20 35 57 98 133 220 314 484 835 1312 1895
40 32 56 91 157 214 352 502 775 1336 2099 3032
2 15 17 31 50 86 117 193 275 425 733 1151 1663
25 29 51 83 143 195 322 459 708 1221 1918 2771
40 47 82 133 229 312 515 734 1133 1954 3069 4434
3 15 23 40 65 113 153 253 361 557 960 1508 2178
25 38 67 109 188 256 421 601 928 1600 2513 3631
40 61 107 174 300 409 674 962 1485 2560 4021 5809
4 15 28 50 80 139 189 312 445 687 1185 1860 2688
25 47 83 134 232 316 520 742 1145 1974 3101 4480
40 75 132 214 371 505 832 1187 1832 3159 4961 7168
5 15 34 59 95 165 225 371 529 816 1407 2210 3193
25 56 98 159 275 375 618 881 1360 2345 3683 5321
40 90 157 254 440 600 988 1409 2176 3752 5892 8514
6 15 39 68 110 191 260 429 611 944 1628 2556 3693
25 65 114 184 318 434 714 1019 1573 2713 4260 6155
40 104 182 294 509 694 1143 1630 2517 4340 6816 9848
7 15 44 77 125 217 295 487 694 1071 1847 2901 4192
25 73 129 209 361 492 811 1157 1785 3079 4835 6986
40 118 206 334 578 787 1297 1851 2856 4926 7736 11178
8 15 49 86 140 242 330 544 776 1198 2066 3245 4688
25 82 144 234 404 550 907 1294 1997 3444 5408 7814
40 131 231 374 646 881 1451 2070 3195 5510 8653 12502
10 15 60 105 170 294 400 659 940 1451 2502 3930 5678
25 99 175 283 489 667 1098 1567 2418 4171 6550 9464
40 159 279 453 783 1067 1758 2507 3869 6673 10480 15142
14 15 80 141 229 396 539 888 1266 1955 3371 5295 7650
25 134 235 381 659 898 1480 2111 3258 5619 8825 12750
40 214 376 610 1055 1437 2368 3377 5213 8991 14119 20401

The values above are calculated for steel pipes medium thickness schedule 40. Using other standards with different inside diameters, the values above should be compensated.

Example - Capacity of 50 mm Steam Pipe

The capacity of a 50 mm steam pipe with 10 bar pressure and steam velocity 25 m/s is 1098 kg/h.

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Related Topics

• Pipe Sizing

Sizing of steam and condensate pipe lines - pressure loss, recommended velocity, capacity and more.

• Steam and Condensate

Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.

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