why pegging is required for deaerator in power plant nd why
maintain the constant pressure in deaerator 3.5 kg/cm2.
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Answer Posted / salil agarwal, power engineer
basically the pegging steam is used to create a scrubbing action between the steam and the feedwater, by which we can eliminate the dissolved corrosive gases mainly oxygen, co2, and ammonia which becomes corrosive at elevated temperatures.
The removal of these gases is necessary to protect the piping and associated equipments.
The gases removed are vented out of the D/A to atmosphere
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