Steam Pipes - Heat Losses (W/m)
Heat losses from un-insulated steam pipes.
Heat loss from steam pipes depends on pipe sizes, insulation qualities, steam temperatures (steam pressures) and surrounding temperatures.
The table below and figure above can be used to estimate heat loss from bare un-insulated horizontal steam pipes - still air conditions - and air temperature ranging 10 oC to 25 oC.
Temperature Difference between Steam and Surrounding air (oC) | Heat Loss (W/m) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Dimension (mm) | ||||||||||
15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 150 | |
56 | 54 | 65 | 79 | 103 | 108 | 132 | 155 | 188 | 233 | 324 |
67 | 68 | 82 | 100 | 122 | 136 | 168 | 198 | 236 | 296 | 410 |
78 | 83 | 100 | 122 | 149 | 166 | 203 | 241 | 298 | 360 | 500 |
89 | 99 | 120 | 146 | 179 | 205 | 246 | 289 | 346 | 434 | 601 |
100 | 116 | 140 | 169 | 208 | 234 | 285 | 337 | 400 | 501 | 696 |
111 | 134 | 164 | 198 | 241 | 271 | 334 | 392 | 469 | 598 | 816 |
125 | 159 | 191 | 233 | 285 | 321 | 394 | 464 | 555 | 698 | 969 |
139 | 184 | 224 | 272 | 333 | 373 | 458 | 540 | 622 | 815 | 1133 |
153 | 210 | 255 | 312 | 382 | 429 | 528 | 623 | 747 | 939 | 1305 |
167 | 241 | 292 | 357 | 437 | 489 | 602 | 713 | 838 | 1093 | 1492 |
180 | 274 | 329 | 408 | 494 | 556 | 676 | 808 | 959 | 1190 | 1660 |
194 | 309 | 372 | 461 | 566 | 634 | 758 | 909 | 1080 | 1303 | 1852 |