Behineh AbMetal tank designer & manufacturerDesigner and manufacturer of metal tanks

Deaerators

Boiler feedwater deaeration

Dissolved oxygen in feedwater pits boiler tubes and shells from the inside. A deaerator heats the water with steam to saturation temperature, where dissolved gases almost entirely leave the water and exit through the vent at the top.

A deaerator has two parts: the deaerating head, where water and steam meet, and the horizontal storage tank below it that holds deaerated water for the feed pump. In a tray type, water spreads over stainless trays; in a spray type, nozzles break it into fine droplets.

The storage tank is a pressure vessel, and its elevation must give the feed pump enough NPSH. For capacity, steam demand and dimensions, use the online deaerator calculator.

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