Three main functions are performed by deaerators: water is stored for the boiler, water is preheated, and non-condensable gases are scrubbed and discharged into the atmosphere. Deaerators must reduce the oxygen level to 7 PBB to prevent oxygen corrosion in the boiler and overall steam systems. We evaluate operation of the deaerator for its performance in removing the non-condensable gases. If a new deaerator is needed, we can also assist with this. Many items must be considered such as, which is the right choice for your operation? (Spray or tray?), what are the correct operating pressures and correct feedpump selection, and how much steam venting is necessary to guarantee proper operation?