What is the function of a lube oil purification system on a marine diesel engine?

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Keeping the lubricating oil clean is the main purpose of a lube oil purification system. By continuously removing water and solid contaminants from the oil, it preserves the lubricating film that protects bearings and engine components from wear and corrosion. Water can enter the system through condensation, fuel leakage, or entrainment and form emulsions that reduce lubrication quality and accelerate corrosion and sludge formation. Dirt, rust, and wear debris can cause abrasive wear and clog oil passages if not removed. The purification equipment—often including centrifuges, coalescers, heaters, and filters—separates water and solids from the oil and returns clean oil back to circulation, helping maintain proper viscosity and oil life. It’s not primarily about cooling the oil, adding detergents to change viscosity, or filtering fuel, which are handled by other subsystems.