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[ibtesam]

Dear friends I am here for one of the problem i am facing in designing the deaerator ,as i know mostly the deaerators are operated at pressure of 0.1-0.2 barg ,but in my case the condensate return to the deaerator is subcool at 125C and 110-120 psig pressure,so it requires to design the deaerator to designed at more than 125c to the corresponding pressure ,So what I want to know,
[b]1.Are the deaerators operate at pressure of 2.0barg or more than this pressure?
2.If yes than can I get some reference to proceed for my problem.

[djack77494]

ibtesam,
I find your posting to be very difficult to understand. Please try to use accurate and proper English to present your problem.

You should operate your deaerator at slightly above atmospheric pressure. Remember, its purpose is to remove dissolved gases from water, and this is best accomplished at the minimum practical pressure (and with the water at/near its boiling point).

I do not know why you are concerned about your return condensate. If it is at 110-120 psig, so what. You will flash it across an inlet valve and drop its pressure down to the deaerator pressure. As you describe it, it will NOT be subcooled following the pressure reduction. (Do an isenthalpic pressure drop at T=125C.) You will, in fact, flash off some steam. Even if it were subcooled, however, that is easily handled by additional heat input to the deaerator.
Doug