Sorry for the previous confusion, Thank you hacksaw for the correction I did in fact mean non-condensible gases, primarly oxygen and CO2 (which under boiler conditions can form carbonic acid). Secondly, the congen plant I work at generates steam at 560 PSIG and 150 PSIG (from waste heat and heat recovery boilers). We have 30 PSIG extraction on both turbine generators and main blower turbines that is used for utilities and let down to 5 PSIG for use in our Deaerators. Our DA 's use a cross flow system and are maintained at 230F. The surplus steam is vented to the atmosphere at Sat. Temp.
I have been working with DA'S for about 3 months and am in no way an expert on the subject, thanks for the help.