Question 183Motor Plants - QMED

The correct answer is A) the jacket water pressure should always be greater than the sea water pressure. In a diesel engine jacket water cooler, the jacket water (fresh water) flows through the cooler and is cooled by the surrounding sea water. To prevent the sea water from leaking into the jacket water system, the jacket water pressure must be maintained at a higher level than the sea water pressure. This pressure differential ensures that any leaks would result in the jacket water flowing outward, rather than sea water flowing inward, which could contaminate the engine's cooling system. The other options are incorrect because: B) the jacket water pressure does not need to be less than the sea water pressure, C) the jacket water temperature is not restricted to be less than 60°F, and D) the sea water temperature is not required to be less than 40°F.