Protection in a boiler from boiler feed water corrosion is accomplished by:

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Protection in a boiler from boiler feed water corrosion is accomplished by:
A . Injecting chlorines to kill microbiological bugs.
B . Injecting caustic to lower the ph to < 4.0.
C . Lowering solids content in boiler feed water to less than 50 ppm.
D . Maintaining a protective corrosion layer of magnetite (Fe3O4).

Answer: D

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