Question 77Steam Plants - Assistant Engineer

The correct answer is B) condensate lines. Excessive carbon dioxide formed by improper chemical treatment in the boiler can cause corrosion in the condensate lines. This is because the carbon dioxide can dissolve in the condensate, forming carbonic acid, which can then attack and corrode the metal of the condensate lines. The other options are not as directly impacted by the presence of excessive carbon dioxide, as the boiler generating tubes, superheater tubes, and steam lines are typically less exposed to the condensate.