Sizing Steam Pipes (kg/h)

Steam is a compressible gas where the mass flow capacity of the pipe lines depends on the steam pressure. This table, where pressure is in bar, velocity in m/s and capacity in kg/h, is suitable for sizing steam pipes

steam pipe sizing

A steam velocity of 25 m/s is in general sufficient for saturated steam applications.

Capacity (kg/hour)
Pressure (bar)Steam Velocity (m/s)Nominal Pipe Size (mm)
15 20 25 32 40 50 65 80 100 125 150 200 250 300
0.4 15 7 14 24 37 52 99 145 213 394 648 917 1606 2590 3680
25 10 25 40 62 92 162 265 384 675 972 1457 2806 4101 5936
40 17 35 64 102 142 265 403 576 1037 1670 2303 4318 6909 9500
0.7 15 7 16 25 40 59 109 166 250 431 680 1006 1708 2791 3852
25 12 25 45 72 100 182 287 430 716 1145 1575 2816 4629 6204
40 18 37 68 106 167 298 428 630 1108 1715 2417 4532 7251 10323
1 15 8 17 29 43 65 112 182 260 470 694 1020 1864 2814 4045
25 12 26 48 72 100 193 300 445 730 1160 1660 3099 4869 6751
40 19 39 71 112 172 311 465 640 1150 1800 2500 4815 7333 10370
2 15 12 25 45 70 100 182 280 410 715 1125 1580 2814 4545 6277
25 19 43 70 112 162 195 428 656 1215 1755 2520 4815 7425 10575
40 30 64 115 178 275 475 745 1010 1895 2925 4175 7678 11997 16796
3 15 16 37 60 93 127 245 385 535 925 1505 2040 3983 6217 8743
25 26 56 100 152 225 425 632 910 1580 2480 3440 6779 10269 14316
40 41 87 157 250 357 595 1025 1460 2540 4050 5940 10479 16470 22950
4 15 19 42 70 108 156 281 432 635 1166 1685 2460 4618 7121 10358
25 30 63 115 180 270 450 742 1080 1980 2925 4225 7866 12225 17304
40 49 116 197 295 456 796 1247 1825 3120 4940 7050 12661 1963 27816
5 15 22 49 87 128 187 352 526 770 1295 2105 2835 5548 8586 11947
25 36 81 135 211 308 548 885 1265 2110 3540 5150 8865 14268 20051
40 59 131 225 338 495 855 1350 1890 3510 5400 7870 13761 23205 32244
6 15 26 59 105 153 225 425 632 925 1555 2525 3400 6654 10297 14328
25 43 97 162 253 370 658 1065 1520 2530 4250 6175 10629 17108 24042
40 71 157 270 405 595 1025 1620 2270 4210 6475 9445 16515 27849 38697
7 15 29 63 110 165 260 445 705 952 1815 2765 3990 7390 12015 16096
25 49 114 190 288 450 785 1205 1750 3025 4815 6900 12288 19377 27080
40 76 177 303 455 690 1210 1865 2520 4585 7560 10880 19141 30978 43470
8 15 32 70 126 190 285 475 800 1125 1990 3025 4540 8042 12625 17728
25 54 122 205 320 465 810 1260 1870 3240 5220 7120 13140 21600 30210
40 84 192 327 510 730 1370 2065 3120 5135 8395 12470 21247 33669 46858
10 15 41 95 155 250 372 626 1012 1465 2495 3995 5860 9994 16172 22713
25 66 145 257 405 562 990 1530 2205 3825 6295 8995 15966 25860 35890
40 104 216 408 615 910 1635 2545 3600 6230 9880 14390 26621 41011 57560
14 15 50 121 205 310 465 810 1270 1870 3220 5215 7390 12921 20538 29016
25 85 195 331 520 740 1375 2080 3120 5200 8500 12560 21720 34139 47128
40 126 305 555 825 1210 2195 3425 4735 8510 13050 18630 35548 54883 76534

The values above are calculated for steel pipes BS 1387:1985 (replaced with the European standard EN 10255:2004) medium thickness. Using other standards with different inside diameters, the values above should be compensated.

Related Topics

  • Steam and Condensate - Steam & condensate properties - capacities, pipe sizing, systems configuration and more
  • Pipe Sizing - Sizing steam and condensate pipes - pressure loss, recommended velocity, capacity and more

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