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.

Heat loss steam coil - chart

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)
Temperature Difference between Steam and Surrounding Air
(oF)
Dimension (inches)
1/23/411 1/41 1/222 1/2346
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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