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Sizing Steam Pipes (lb/h)

Steam is a compressible gas where the capacity of a pipe line depends on the size of the pipe and the steam pressure.

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This table below can be used for fast calculation of steam pipes sch. 80.

  • in general - 80 ft/sec is a recommended steam velocity

For full table with larger dimensions - rotate the screen!

Capacity (lb/h)
Gauge Pressure
(psi)
Steam Velocity
(ft/s)
Pipe Size (in)
1/2"3/4"1"1 1/4"1 1/2"2"2 1/2"3"4"5"6"8"10"12"
Inside Diameter (in)
0.550.740.961.281.51.942.322.93.834.815.767.639.5611.38
5 50 15 27 45 80 110 184 263 411 716 1130 1620 2843 4464 6325
80 24 43 72 128 176 294 421 657 1146 1808 2593 4550 7142 10121
120 35 64 108 192 264 441 631 986 1720 2712 3889 6824 10713 15181
10 50 18 33 55 97 134 224 320 500 873 1377 1974 3464 5438 7705
80 29 52 88 156 214 358 512 801 1396 2203 3159 5542 8701 12329
120 43 78 132 234 321 537 769 1201 2095 3304 4738 8313 13051 18493
20 50 25 45 76 135 186 310 444 694 1210 1909 2737 4803 7540 10684
80 40 72 122 216 297 497 710 1110 1936 3054 4379 7685 12064 17095
120 60 108 182 324 445 745 1066 1665 2904 4581 6569 11527 18096 25642
30 50 31 57 96 170 234 391 559 873 1522 2401 3443 6042 9485 13440
80 50 91 153 272 374 625 894 1396 2436 3842 5509 9667 15176 21504
120 75 136 230 408 560 937 1341 2095 3654 5762 8264 14500 22763 32256
40 50 38 69 116 206 282 472 676 1056 1842 2905 4165 7309 11474 16258
80 61 110 185 329 452 756 1081 1689 2947 4647 6664 11694 18358 26013
120 91 165 278 494 678 1134 1622 2534 4420 6971 9997 17541 27537 39020
60 50 51 92 155 275 378 633 905 1414 2466 3889 5577 9787 15364 21771
80 81 147 248 441 605 1012 1448 2262 3946 6223 8924 15659 24582 34833
120 122 221 372 661 908 1518 2172 3393 5918 9334 13386 23488 36873 52250
80 50 64 115 194 344 473 791 1132 1768 3084 4864 6975 12239 19213 27225
80 102 184 310 551 757 1266 1810 2829 4934 7782 11160 19582 30741 43560
120 153 276 465 827 1135 1899 2716 4243 7401 11673 16739 29373 46112 65340
100 50 76 138 233 413 568 950 1358 2122 3702 5839 8373 14693 23066 32684
80 122 221 372 662 909 1520 2173 3396 5923 9342 13397 23508 36905 52294
120 183 332 558 992 1363 2280 3260 5094 8885 14014 20096 35262 55358 78442
120 50 89 161 271 482 661 1106 1582 2472 4312 6801 9752 17112 26864 38066
80 142 258 433 771 1058 1770 2531 3955 6899 10881 15603 27379 42982 60906
120 213 386 650 1156 1587 2655 3797 5933 10348 16321 23405 41069 64473 91359
150 50 108 196 330 587 806 1349 1929 3013 5256 8290 11888 20859 32747 46402
80 173 314 528 939 1290 2158 3086 4821 8409 13264 19020 33375 52394 74243
120 260 471 793 1409 1935 3236 4628 7232 12614 19895 28530 50062 78592 111364
200 50 139 251 423 752 1032 1727 2469 3858 6730 10614 15221 26708 41928 59412
80 222 402 676 1203 1652 2763 3951 6173 10767 16982 24353 42732 67084 95058
120 333 603 1015 1804 2477 4144 5926 9260 16151 25473 36529 64098 100627 142588

Example - Sizing Steam Pipe Lines

A 4 inch sch. 80 steel pipe with 100 psi steam pressure has a capacity of 5923 lb/h with steam velocity 80 ft/s.

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