www.saVRee.com Deaerators Explained| pg. 5
Chemical dosing occurs on the makeup inlet line, within the deaerator, or between the
deaerator and boiler. The chemicals needed, their quantity, and where dosing should
occur, depend upon the system design. For example, makeup water supplied from a
reverse osmosis (RO) plant will have a low pH and should be treated before it enters the
deaerator.
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Deaerator Components
A deaerator is an un�red pressure vessel. Deaerators are typically manufactured from
carbon steel, although some industries -such as the pharmaceutical industry- use
stainless steel. The pressure vessel is cylindrical in shape with as few welds and
penetrations as possible.
Attached to the deaerator are connections to the various systems it serves and other
appendages required to operate the deaerator. Common deaerator system connections
and appendages include:
•
Low pressure steam inlet.
•
Makeup water inlet.
•
Condensate inlet.
•
Feedwater outlet.
•
Safety relief valve (SRV).
•
Water column or siphon.
•
Level sight glass.
•
Level control sensor.
•
Drain line (for maintenance).
•
Over�ow pipe (non-return design).
•
Chemical injection point.
•
Flanges for gauges (pressure and temperature gauges etc.).