Generation of Condensate in Cold Steam Pipes - SI Units

Huge amounts of condensate generated when cold steam pipes are heated up must be drained from the pipes

When cold steam pipes are heated up huge amounts of condensate are generated and must be drained from the pipes. It is important that steam traps are designed to handle start-up loads.

The diagram and table below can be used to roughly estimate the load of warm-up condensate generated when a steam system is heated up.

Condensate load generated i cold steam pipes at start-up - diagram

Condensate Load (kg/100 m)
Steam Pressure (bar)Nominal Pipe Dimension (mm)
50 65 80 100 125 150 200 250 300 350 400 450 500 600
0 9.2 14.4 19 27 37 47 71 101 134 159 208 262 308 309
0.35 10 15.9 20.8 29 40 52 69 112 146 174 227 287 338 470
0.7 11.3 17.8 23.4 33 45 58 88 125 165 196 255 322 379 529
1 12.2 19.5 25.4 36 50 64 96 135 179 212 277 350 412 575
2.5 13.4 21.3 27.8 39 53 70 105 148 195 232 303 383 450 627
4 15.8 25.2 33 47 63 82 123 175 233 276 360 454 535 745
5.5 17.8 28 37 52 71 92 138 196 260 308 402 507 598 832
7 19.3 30.6 40 57 77 100 151 214 284 335 438 553 651 906
8.5 20.1 31.8 42 59 80 104 157 223 293 349 455 574 676 942
10 20.8 33.1 43 62 83 108 162 230 305 361 472 595 700 997
12 22.6 35.8 47 67 90 117 176 250 331 392 513 646 760 1059
14 24.2 38.2 50 71 96 125 189 267 353 418 546 689 811 1130
16 28.1 45 58 83 113 146 219 312 412 489 638 805 947 1320
20 36 55 74 108 150 205 312 463 637 764 981 1228 1503 1700
25 39 59 80 117 162 222 338 502 692 828 1065 1362 1631 2315
30 41.5 64 85 124 173 237 360 534 735 882 1134 1420 1763 2464
40 44.3 68 91 132 184 253 385 570 784 940 1210 1514 1852 2627

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