www.saVRee.com Deaerators Explained| pg. 7
Although spray deaerators are often mounted to the top of feedwater tanks, they can
also be installed within the feedwater tank. A deaerator mounted above a feedwater tank
will appear either as a small tank connected by a pipe to the feedwater tank, or, as a
dome or vertical column, mounted directly to the feedwater tank.
Makeup water will pass through the deaerator when it enters the system. Condensate
may or may not pass through the deaerator depending upon its condition when returned
to the feedwater tank. Deaerator designs vary because each steam system has unique
requirements.
How Tray Deaerators Work
Water enters the deaerator and �lls the water box. The water box is a temporary holding
area that ensures water is fed evenly through a series of spray nozzles, then into the
deaerator.
Each spray nozzle acts as a non-return valve and will close if the water box has insu�cient
water pressure. To ensure long life, spray nozzles, the surrounding spray area and the
trays, are all constructed of stainless steel.
Spray Tray Deaerator
Once the water has passed through the spray nozzles, it comes into direct contact with
the steam. The steam �ows in a counter direction to the water. As the steam heats the
water, the dissolved gases are liberated. The quantity of dissolved gases present reduces