Calculator
Condensate Flash Steam Calculator
Calculate how much flash steam is generated when high-pressure condensate drops to a lower pressure — essential for flash vessel sizing and energy recovery.
Interactive toolUpdated July 2026
Inputs
Condensate at this pressure, hf = 781 kJ/kg.
Flash vessel/return pressure, hfg = 2257 kJ/kg.
Results
Flash Steam Fraction
16.1 %
of condensate flashes to steam at 0 bar
Flash vs Condensate
16.1%
condensate
Flash Steam
161 kg/hr
Remaining Condensate
839 kg/hr
How It Works
x = (hf_high − hf_low) / hfg_low
When high-pressure condensate drops to a lower pressure, its enthalpy (hf_high) exceeds the liquid enthalpy at the low pressure (hf_low). The surplus energy vaporises part of the condensate — the fraction that flashes equals the surplus divided by the latent heat at the low pressure.