Deaerator is used to remove gas (oxygen, carbon dioxide) from feed-water for preventing corrosion inside of piping and heat-exchanger. At the same time, it can be utilized to heat feed-water, and maintain stable NPSH (Net Positive Suction Head) of feed-pump. 
Spray & Tray type is generally used in onshore plants while Spray & Scrubber type is applied to the ships. 
DongHwa Entec is developing and testing Spray, Tray and Scrubber type deaerator, and distributing them to market. Moreover, research and development are still going on for further improvement of their performances. 
We can meet any requirement from customer, over the whole process including performance design, strength design, material procurement, manufacturing and delivery.