Sizing Condensate Pipe Lines - SI Units

Steam distribution systems and sizing condensate return lines

When sizing condensate return lines in steam distribution system - remember that the maximum condensate flow is achieved during plant start up when pipes and equipment are heated up.

A rule of thumb - the condensate load used to design condensate pipe lines should be twice the maximum production load.

Condensate Flow (kg/hour)
Pressure lossPipe Size (mm, inch)
15 20 25 32 40 50 65 80
(Pa/m) (mbar/m) 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
28 0.28 90 209 380 865 1320 2554 5194 8079
29 0.29 92 214 400 878 1340 2590 5271 8196
30 0.3 93 218 403 890 1361 2631 5348 8314
33 0.33 97 226 414 930 1420 2744 5579 8677
39 0.39 107 249 469 1028 1565 3025 6142 9526
40 0.4 108 253 476 1040 1583 3062 6214 9639
43 0.43 113 263 496 1079 1646 3180 6454 10024
45 0.45 116 270 508 1107 1687 3261 6618 10297
47 0.47 119 277 521 1134 1728 3338 6777 10523
50 0.5 123 286 538 1172 1787 3447 6949 10859
53 0.53 127 296 557 1211 1846 3565 7235 11249
55 0.55 130 302 569 1238 1887 3638 7380 11476
57 0.57 133 308 580 1261 1923 3710 7525 11703
59 0.59 135 314 591 1288 1959 3783 7666 11884
61 0.61 138 320 602 1311 1996 3851 7806 12111
64 0.64 141 327 615 1338 2041 3933 7970 12383
67 0.67 146 337 634 1379 2100 4051 8210 12746
69 0.69 148 343 645 1402 2136 4119 8342 12973
71 0.71 150 348 655 1424 2168 4182 8473 13154
73 0.73 152 354 665 1447 2200 4246 8600 13336
76 0.76 155 359 675 1465 2236 4305 8723 13563
77 0.77 157 365 685 1488 2268 4368 8850 13744
78 0.78 158 366 689 1497 2282 4390 8900 13812
80 0.8 160 370 695 1510 2300 4427 8972 13925
82 0.82 162 375 704 1529 2331 4491 9072 14407
88 0.88 168 391 733 1590 2427 4536 9453 14651
90 0.9 170 395 740 1606 2449 4717 9548 14787
98 0.98 179 414 777 1696 2567 4944 10025 15513
100 1 180 418 785 1701 2590 4990 10115 15649
114 1.14 194 450 845 1832 2790 5366 10841 16828
118 1.18 198 457 857 1860 2830 5443 11022 17055
120 1.2 199 462 867 1880 2860 5502 11113 17282
131 1.31 209 484 907 1969 2994 5761 11657 18053
137 1.37 215 497 931 2018 3071 5906 11948 18507
140 1.4 216 502 939 2037 3103 5965 12066 18688
147 1.47 224 516 966 2096 3189 6128 12383 19187
157 1.57 231 534 1002 2168 3298 6337 12814 19822
160 1.6 234 541 1011 2195 334 6409 12973 20049
163 1.63 237 546 1025 2218 3370 6477 13109 20276
176 1.76 246 570 1066 2309 3511 6740 13608 21092
180 1.8 249 576 1075 2331 3547 6808 13744 21319
196 1.96 261 603 1129 2440 3710 7130 14379 22317
200 2 265 611 1143 2472 3760 7221 14560 22589
212 2.12 273 629 1179 2549 3874 7430 15014 23270
216 2.16 275 634 1188 2567 3905 7493 15132 23451
220 2.2 278 641 1200 2595 3942 7570 15277 23678
229 2.29 284 655 1225 2649 4028 7729 15604 24177
235 2.35 288 664 1243 2689 4086 7843 15840 24522
240 2.4 292 672 1256 2719 4129 7927 16017 24780
245 2.45 295 679 1270 2749 4173 8010 16193 25039
255 2.55 301 694 1297 2806 4260 8176 16520 25556
260 2.6 304 701 1311 2834 4304 8260 16683 25814
261 2.61 305 703 1315 2844 4318 8287 16738 25900
274 2.74 313 721 1348 2917 4331 8501 17173 26554
277 2.77 315 727 1356 2935 4459 8555 17282 26717
280 2.8 317 730 1363 2948 4479 8593 17357 26839
294 2.94 325 749 1402 3025 4595 8813 17781 27533
300 3 328 757 1414 3055 4641 8900 17956 27803
310 3.1 335 771 1438 3112 4726 9063 18280 28305
314 3.14 336 775 1446 3129 4752 9074 18380 28459
320 3.2 340 784 1462 3163 4825 9204 18579 28767
327 3.27 344 792 1479 3198 4853 9299 18779 29076
333 3.33 348 801 1495 3230 4904 9408 18979 29366
340 3.4 351 809 1511 3263 4955 9516 19178 29656
342 3.42 353 813 1520 3279 4980 9571 19278 29801
353 3.53 358 825 1541 3328 5054 9707 19550 30237
359 3.59 362 834 1556 3361 5103 9798 19732 30527
360 3.6 363 835 1558 3365 5109 9809 19754 30564
372 3.72 369 850 1585 3423 5201 9979 20094 31108
376 3.76 371 854 1592 3438 5225 10024 20185 31253
380 3.8 373 859 1601 3457 5254 10081 20299 31423
392 3.92 379 873 1628 3515 5339 10251 20639 31933
400 4 383 883 1646 3554 5398 10342 20866 32274
408 4.08 388 892 1665 3592 5457 10433 21092 32614
412 4.12 390 896 1672 3608 5479 10478 21174 32750
420 4.2 394 906 1690 3646 5536 10592 21378 33090
425 4.25 396 912 1701 3670 5570 10660 21500 33294

Equipment Piping and Condensate Load

Typical maximum condensate load and equipment outlet pipe size:

Maximum Condensate Load
(kg/h)
Equipment Outlet Pipe Size
(mm, (in))
200 15 (1/2)
500 20 (3/4)
1000 25 (1)
2000 32 (1 1/4)
3000 40 (1 1/2)
5000 50 (2)
> 5000 65 - 100 (2 1/2 - 4)

Related Topics

  • Steam and Condensate - Steam & condensate systems- 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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