In a diesel engine jacket water cooler, what should the jacket water pressure always be compared to sea water pressure?

The correct answer emphasizes the importance of maintaining a higher jacket water pressure compared to sea water pressure within a diesel engine's cooling system. This is crucial for several reasons:

Primarily, keeping the jacket water pressure higher ensures that there is no reverse flow of sea water into the engine cooling system. If the jacket water pressure were to drop below that of the sea water, it could allow sea water to enter the jacket water side of the cooler. This could potentially lead to contamination and corrosion, severely affecting the engine's overall integrity and performance.

Additionally, a higher pressure helps to improve the efficiency of the heat exchange process between the jacket water and the cooling medium (in this case, sea water). It aids in maintaining effective cooling of the engine components, which is vital in preventing overheating and ensuring reliable operation.

In summary, maintaining a higher jacket water pressure in relation to sea water pressure is critical for preventing contamination and ensuring efficient cooling in diesel engine systems.