Steam - Gravity Return Condensate Pipes - Capacities
Max. capacities (lb/hour) in gravity condensate return lines.
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.
| Nominal Pipe Size (inches) | Maximum Condensate Capacity (lb/hr) | ||||||
|---|---|---|---|---|---|---|---|
| Pitch of pipe (ft/100 ft of length, m/100 m of length) | |||||||
| 0.5 | 1 | 2 | 3 | 5 | 10 | 20 | |
| 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
