🔍 Key Concepts
• Main propulsion turbine reduction gears typically require positive, reliable lubrication at all times
• Difference between forced (pressure) lubrication, ring lubrication, splash lubrication, and spray lubrication
• Consequences of loss of oil film on high-speed, high-load gear teeth
💭 Think About
• Think about the speed and load on main turbine reduction gears: would a passive method (like dipping or splashing) be reliable enough?
• Which method gives the most controlled, continuous flow of clean, cooled oil to the gear teeth and bearings, even at low shaft speeds or during maneuvering?
• Consider which methods are more common on smaller, lightly loaded gears versus large, high-power main reduction gears.
✅ Before You Answer
• Verify which method provides forced, continuous lubrication independent of gear speed
• Check which options depend on gear or ring motion dipping into a sump (these are more like splash or ring lubrication used on smaller machinery)
• Confirm which method is typically paired with filters, coolers, and alarms in a dedicated lube oil system for main reduction gears