Which component prevents overheating of the pump in the Auxiliary Machinery Cooling Water system?

The component that prevents overheating of the pump in the Auxiliary Machinery Cooling Water system is the recirculation line. This line is designed to divert a portion of the cooling water back to the pump's inlet. By allowing some of the water to cycle back rather than being entirely sent out to the machinery or system being cooled, it helps maintain an adequate flow of water through the pump. This action ensures that the pump remains cool by preventing excessive heat buildup, which can occur during operation due to friction and hydraulic losses.

In a cooling system, the temperature of the water can rise if it is too stagnant or if the flow rate is insufficient. The recirculation line plays a critical role in maintaining the pump's operational temperature, especially during low-load situations when the demand for cooling might be lower, thereby preventing potential damage due to overheating.

Other components mentioned, like the settling tank, cools water by allowing sediments to settle out before it's pumped but does not directly manage temperature during operation. Similarly, the cooling valve regulates water flow but does not actively prevent overheating. The pumping station is crucial for overall system performance but does not serve the specific purpose of preventing pump overheating.