Deaerator is a device that is widely used for the removal of air and other dissolved gases from the feedwater  to steam-generating boilers. In particular, dissolved oxygen in boiler feedwaters will cause serious corrosion damage in steam systems by attaching to the walls of metal piping and other metallic equipment and forming oxides (rust). Water also combines with any dissolved carbon dioxide  to form carbonic acid  that causes further corrosion. Most deaerators are designed to remove oxygen down to levels of 7 ppb by weight(0.0005 cm³/L) or less.

There are two basic types of deaerators, the tray-type and the spray-type:

  • The tray-type (also called the cascade-type) includes a vertical domed deaeration section mounted on top of a horizontal cylindrical vessel which serves as the deaerated boiler feedwater storage tank.
  • The spray-type consists only of a horizontal (or vertical) cylindrical vessel which serves as both the deaeration section and the boiler feedwater storage tank.

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