Question 72Steam Plants - 1st Asst/Chief

The correct answer is C) condensate lines. Excessive carbon dioxide formed by improper chemical treatment in the boiler can cause corrosion in the condensate lines. This is because carbon dioxide dissolves in the condensate, forming carbonic acid, which is corrosive to metal components. The condensate lines are particularly vulnerable as they carry the condensed steam back to the boiler, and the presence of this acidic solution can lead to corrosion. The other options are incorrect because the superheater tubes, generating tubes, and steam lines are not directly exposed to the corrosive effects of the carbon dioxide-induced carbonic acid in the same way as the condensate lines.