Type .03 DA atmospheric deaerators are recommended for low-pressure boiler applications. The standard .03 design removes dissolved oxygen to a maximum level of .03 cubic centimeters per liter of feed water. The amount of hot condensate returns influences which design is most appropriate for applications. A single-compartment .03 DA unit is typically used on systems having 80% or more make-up water. Two-compartment design (.03 DA-2C) or two-tank design (.03 DA-2T) that includes a standalone surge tank is typically used on systems having more than 20% return hot condensate.
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