Question 178Steam Plants - QMED

The correct answer is C) contaminated drain system. Condensate return lines from tank heating coils are designed to lead the condensate to the contaminated drain system. This is because the condensate may contain contaminants or residues from the tanks or heating coils, and it needs to be properly disposed of or treated rather than being discharged directly overboard. The other answer choices are incorrect because they do not represent the proper destination for the condensate. A DC heater is used to heat the vessel, not for draining condensate. The atmospheric drain tank is a separate system for collecting and draining non-contaminated waste. The main condenser is a component of the propulsion system, not the condensate disposal system.