www.saVRee.com Deaerators Explained pg.
5
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).
•
Overflow pipe (non-return design).
•
Chemical injection point.
•
Flanges for gauges (pressure and temperature gauges etc.).
Tray Deaerator Connections
A pressurized deaerator will operate at approximately 5 psi at 230°F (imperial), or 0.4 bar
at 105°C (metric). Deaerator feedwater will be maintained as close to the saturation
temperature as possible in order to reduce the level of dissolved gases as much as
possible, but without the water changing phase to steam. If the feedwater exceeds its
saturation temperature, it will begin to form steam and will either condense, or be vented
to atmosphere, both of which are not desired.