Flash Steam Generation (bar)
When condensate leaves the steam traps - flash steam is generated. Table indicating amount of flash steam generated at different pressures - bar
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The amount of flash steam generated depend on the steam
pressure - the pressure in the condensate before it leaves the condensate trap - and the condensate pressure after the trap - the pressure in the
condensate return pipe lines.
The diagram and table below indicates the ratio of flash steam generated at
different pressures before and after the condensate trap.
| Percent Flash Steam of Condensate (%) | |||||||
| Steam Gauge
Pressure (bar) |
Condensate Gauge Pressure (bar) | ||||||
| 01) | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | |
| 0 | 0.0 | ||||||
| 1 | 3.8 | 1.7 | 0.0 | ||||
| 2 | 6.3 | 4.2 | 2.6 | 1.2 | 0.0 | ||
| 3 | 8.3 | 6.2 | 4.5 | 3.2 | 2.0 | 0.8 | 0.0 |
| 4 | 9.8 | 7.7 | 6.1 | 4.8 | 3.6 | 2.4 | 1.7 |
| 5 | 11.2 | 9.1 | 7.5 | 6.2 | 5.0 | 3.8 | 3.1 |
| 6 | 12.3 | 10.3 | 8.7 | 7.4 | 6.3 | 5.0 | 4.3 |
| 7 | 13.4 | 11.4 | 9.8 | 8.5 | 7.4 | 6.2 | 5.4 |
| 8 | 14.4 | 12.3 | 10.8 | 9.5 | 8.4 | 7.2 | 6.5 |
| 9 | 15.2 | 13.2 | 11.7 | 10.4 | 9.3 | 8.1 | 7.4 |
| 10 | 16.1 | 14.1 | 12.5 | 11.3 | 10.1 | 9.0 | 8.3 |
| 11 | 16.8 | 14.8 | 13.3 | 12.0 | 10.9 | 9.8 | 9.1 |
| 12 | 17.5 | 15.6 | 14.1 | 12.8 | 11.7 | 10.5 | 9.8 |
| 13 | 18.2 | 16.3 | 14.8 | 13.5 | 12.4 | 11.2 | 10.6 |
| 14 | 18.9 | 16.9 | 15.4 | 14.2 | 13.1 | 11.9 | 11.2 |
| 15 | 19.5 | 17.6 | 16.1 | 14.8 | 13.7 | 12.6 | 11.9 |
1) It is common to vent the condensate system to the atmosphere - where the gauge pressure is 0 bar.
- 1 bar = 105 Pa (N/m2) = 10.197 kp/m2 = 10.20 m H2O = 0.9869 atm = 14.50 psi (lbf/in2)
Example - Generated Flash Steam
A condensate system is vented to the surroundings and the pressure in the condensate system after the condensate traps is
0 bar gauge. The
absolute steam pressure before the condensate trap is 10 bar gauge.
According the table above 16.1% of the condensate will evaporate as flash steam after the trap.
Note! Without a flash recovery system the energy in the flash steam will be lost to the surroundings.
If you prefer Imperial units - go here !
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