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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.

[Adriaan]

Where I work the powerplant has a combined deaerator / accumulator tank which can be operated at a pressure of 1.8 barg (weighted safety valve limit) BUT then again it receives a lot of HOT wastewater (almost steam) and the pressure is steam controlled which means that the condensate to be deaerated is finely dispersed in a steam atmosphere. We normally operate the deaerator at a significantly lower pressure (around 0.8 barg) to reduce resistance in the condensate lines (not all condensate needs to be deaerated at our plant) and this has been shown to have a positive side-effect; the deaerator vents produce less steam and make a lot less noise. This in turn has reduced the wear on the surrounding equipment (which was caused by the steam cloud, neccesitating more frequent paintwork etcetera).

so [1.] I am not personally aware of a deaerator operated at over 2 barg and [2.] you'll need to add energy (steam) to the deaerator to make it work (at 2 barg the boilingpoint is about 160 'C after all). Oh and [3.] at this higher pressure the venting off system would most likely cause a lot of noise and a sizeable cloud of steam so you'll want to leave quite a bit of empty space around the deaerator!