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This package boiler design was developed from their field assembled "F" series boilers (F FF FH FL FP and FO). The FO is the actual forerunner to the FM design. The D-type shop-assemble boiler (i.e. Foster Wheeler AG and the Babcock & Wilcox FM) has a D-shaped furnace area on one side with the boiler bank on the other and it utilizes two drums.
An anti-corrosive agent for boilers which comprises diethanolamine can additionally contain a deoxidizer such as hydrazine 1-aminopyrrolidine NN-diethylhydroxylamine ascorbic acid and a salt thereof and another anti-corrosive agent comprising a neutralizing amine and can be added to mainly boiler water having a superheater and a steam turbine.