Insulated Steam Pipes - Generated Condensate

Heat loss from steam pipes generates condensate which must be drained from the system - imperial units

Condensate load generated in insulated steam pipes at different steam pressures and piping dimensions:

Steam pipes - condensate load generated during operating load

Condensate Load (lb/h per 100 ft)
Steam Pressure
(psi)
Pipe Size (inch)
22 1/234568101214
10 6 7 9 11 13 16 20 24 29 32
30 8 9 11 14 17 20 26 32 38 42
60 10 12 14 18 24 27 33 41 49 54
100 12 15 18 22 28 33 41 51 61 67
125 13 16 20 24 30 36 45 56 66 73
175 16 19 23 26 33 38 53 66 78 86
250 18 22 27 34 42 50 62 77 92 101
300 20 25 30 37 46 54 68 85 101 111
400 23 28 34 43 53 63 80 99 118 130
500 27 33 39 49 61 73 91 114 135 148
600 30 37 44 55 68 82 103 128 152 167
800 36 44 53 69 85 101 131 164 194 214
1000 43 52 63 82 101 120 156 195 231 254
1200 51 62 75 97 119 142 185 230 274 301
1400 60 73 89 114 141 168 219 273 324 356
1600 69 85 103 132 163 195 253 315 375 412
1750 76 93 113 145 179 213 278 346 411 452
1800 79 96 117 150 185 221 288 358 425 467

The condensate load calculations are based on a surrounding temperature 70 oF and 80% efficient insulation. For temperatures at 0 oF the loads should be added approximately 50%.

  • 1 ft (foot) = 0.3048 m
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar
  • 1 lb = 0.4536 kg

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