What is the purpose of purge mist in oil mist systems?

• A. To prevent moisture ingress into the system
• B. To remove oil mist after use
• C. To cool the oil supply
• D. To seal the sump from ambient air

Answer: (A)

Purging with dry air in an oil mist system is about keeping the internal environment free of moisture. When the system is idle or during starts, ambient humidity can enter and condense in the oil and lines, which degrades lubrication and can lead to corrosion or contamination. A purge mist introduces a small, dry air flow (carrying a little oil mist) that pushes out this humid air and any condensate, creating a dry, clean atmosphere inside the reservoir and piping. This helps maintain oil quality and reliable lubrication. Purge mist isn’t meant to remove oil mist after use, cool the oil supply, or seal the sump from ambient air.