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Steam - Gravity Return Condensate Pipes - Capacities

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The table below can be used for vented pipe lines where condensate is recovered by gravity.

Values are calculated with Manning's Formula for Gravity Flow with roughness coefficient 0.015 and 50% filled ANSI Schedule 40 steel pipes. Note that the capacities for 100% filled pressurized condensate pipes are higher.   

Steam Gravity Return Condensate Pipes - Capacities
Nominal Pipe Size (inches)Maximum Condensate Capacity (lb/hr)
Pitch of pipe (ft/100 ft of length, m/100 m of length)
0.512351020
1 371 524 741 908 1172 1657 2344
1 1/4 768 1087 1537 1882 2430 3437 4860
1 1/2 1155 1634 2311 2830 3654 5167 7307
2 2260 3196 4520 5536 7147 10107 14293
3 6462 9139 12925 15929 20436 28901 40872
4 13215 18689 26430 32370 41790 59100 83580
5 24212 34241 48424 59307 76565 108280 153131
6 39646 56067 79291 97111 125370 177300
8 82819 117123 165637 202863 261896 370376
10 152141 215160 304182 372668 481112
12 240983 340801 481965 590285 762054
  • 1 ft (foot) = 0.3048 m
  • 1 in (inch) = 25.4 mm

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