Oxygen in feed water is always harmful to boilers it corrodes metal parts.Deaerators are used to remove free Oxygen from boiler feed water performance of Deaerator is depend upon effective method of activity maximum water and steam surface contact with higher time of contact. Our design achieves these requirements very efficiently by planned spray pattern, highly effective scrubbing by multiple tray arrangement and mixing incoming steam with water. We can residual O2 level below 0.007 PPM after deaeration which satisfies requirement of modern high boilers.