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(mechanical engineering)
A device in which oxygen, carbon dioxide, or other noncondensable gases are removed from boiler feedwater, steam condensate, or a process stream.



a device for the deaeration of water—that is, the removal of gases dissolved in it. Deaerators are usually installed in steam power plants and are used to treat feed water delivered to steam generators and supplementary water delivered to the heating network. In the absence of deaeration the corrosive active gases usually dissolved in water (oxygen and free carbon dioxide), which are liberated in a steam generator or heating network, would cause corrosion of metals. Deaerators can be classified according to their principle of operation as thermal (the most widely used type), desorption, or chemical types.

air-oil separator

air-oil separatorclick for a larger image
A component in a gas turbine lubrication system in which air is removed from scavenged oil before its return to the oil tank. The scavenged oil is churned, resulting in air coming to the surface, which is then bled out before returning the oil to the tank. Also called a deaerator.
References in periodicals archive ?
This is the main component that removed in the deaerator and characterized by the molar concentration and the partial pressure of oxygen in the atmosphere.
A pressurised deaerator is one way to meet the requirements of BS EN 12953 Part 10.
7) Effective deaeration of coatings can only occur when the defoamer or deaerator is active in the bulk of the coating liquid as well as at the surface.
Unlike most conventional defoamers which are active only at the coating of the surface, Airase 8070 deaerator is effective in eliminating microfoam, a major problem faced by low-VOC waterborne formulators, and reducing pinholes and craters in coating film to improve gloss, depth of image among other aesthetical properties said the company.
Both pumps have a 1-inch discharge recirculation line that provides a minimum continuous flow of 10 percent (about 30 gpm in this case) back to the deaerator to assure against a "no flow" condition inside the pump when the steam drum level control valve goes automatically closed.
Spacers of 200 and 300 mm length are available which can be used individually or in combination to vary the length of the deaerator column.
Breakbulk carrier Conveyor Logistics has completed the delivery of a boiler drum, deaerator and stator assembly for Bangladesh's Barapukuria power plant.
SPIRAX SARCO has launched a pressurised deaerator system that Is said to reduce the dissolved oxygen content of boiler feedwater to virtually nil without chemical treatment.
Evonik has launched Tego Airex 921, a deaerator that has been designed specifically for UV-curable printing inks and coatings for food packaging.
Tego Airex 950 is a polyether siloxane copolymer and Tego Airex 955 is a silicone-free deaerator.
There are several quick and easy lab screening tests that help the formulator find the right defoamer or deaerator.