Steam Pipes - Heat Losses (W/m)
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 10oC to 25oC.
| 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 |
Related Topics
• Insulation and Heat Loss from Steam and Condesate Pipe Lines
Heat loss from uninsulated and insulated steam and condensate pipes and tanks. Calculate insulation thicknesses.
• Steam and Condensate
Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.
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