Heat Loss from Steam Pipes
Amount of condensate generated in steam pipes depends on the heat loss from the pipe to the surroundings
The heat loss is a function of the pipe size and insulation quality, the steam temperature (pressure) and the surrounding temperature.
The table below and figure above can be used for estimating heat loss from bare uninsulated horizontal steam pipes - still air conditions - air temperature ranging 50oF to 70oF.
Heat Loss (Btu/h per ft) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Difference between Steam Temperature and Surrounding Air Temperature (oF) | Dimension (inches) | |||||||||
1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 | 6 | |
100 | 56 | 68 | 82 | 107 | 113 | 138 | 163 | 194 | 243 | 337 |
120 | 71 | 85 | 104 | 127 | 142 | 175 | 206 | 246 | 308 | 427 |
140 | 86 | 104 | 127 | 155 | 173 | 212 | 251 | 300 | 375 | 521 |
160 | 103 | 125 | 152 | 186 | 213 | 256 | 301 | 360 | 451 | 626 |
180 | 121 | 146 | 176 | 217 | 243 | 297 | 351 | 417 | 522 | 725 |
200 | 139 | 171 | 206 | 251 | 282 | 346 | 408 | 488 | 622 | 850 |
225 | 166 | 199 | 243 | 297 | 334 | 410 | 483 | 578 | 726 | 1009 |
250 | 192 | 233 | 284 | 347 | 389 | 478 | 563 | 674 | 849 | 1180 |
275 | 220 | 266 | 326 | 398 | 447 | 550 | 649 | 778 | 978 | 1360 |
300 | 251 | 304 | 372 | 455 | 510 | 628 | 742 | 888 | 1140 | 1557 |
325 | 285 | 343 | 425 | 520 | 580 | 705 | 843 | 1010 | 1240 | 1730 |
350 | 322 | 388 | 480 | 590 | 660 | 790 | 945 | 1130 | 1358 | 1930 |
- 1 Btu/h per ft = 0.96 W/m
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