Question 65 QMED03 - Oiler

The Correct Answer is C **Explanation for Option C (Main condenser):** The **Main condenser** is responsible for condensing the majority of the steam (exhaust steam from the main turbines) back into water to maintain the vacuum necessary for efficient turbine operation. To handle this large heat load, the Main condenser requires a high flow rate of cooling medium. On ships operating in marine environments, this cooling medium is overwhelmingly supplied by **sea water** (or sometimes brackish water in estuaries), which is continuously pumped through the condenser tubes. **Why the other options are incorrect:** * **A) Gland exhaust condenser:** This unit handles very low volumes of steam (from turbine shaft gland seals). It is typically cooled by condensate (the pure distilled water returning from the Main condenser pump) or occasionally by lubricating oil (LO) in certain systems. It is not cooled by sea water. * **B) Vent condenser:** This unit condenses flash steam released from the deaerator or feed system vents. Its cooling medium is almost always the relatively cold feed water being delivered to the deaerator (before heating), allowing it to recover heat and pure water. It is not cooled by sea water. * **D) Air ejector condenser:** This unit is part of the system used to maintain vacuum in the main condenser by removing non-condensable gases (air). It uses the pure condensate (water extracted from the Main condenser) as its cooling medium to recover the pure water content of the ejector steam. It is not cooled by sea water.