🔍 Key Concepts

• Principle of centrifuging: how separation of oil and water depends on density difference, residence time, and bowl speed • Effect of temperature on viscosity: how lube oil temperature changes its flow and separation characteristics • Manufacturer’s operating limits for lube oil centrifuges, especially recommended inlet temperature and flow rate

💭 Think About

• Which action directly improves the physical separation of water from oil inside the centrifuge, rather than just monitoring conditions or maintenance intervals? • How does oil viscosity affect the ability of water droplets to move outward under centrifugal force—thicker (colder) oil vs thinner (warmer) oil? • What happens inside the bowl if the feed rate is too high compared to the machine’s rated capacity?

✅ Before You Answer

• Identify which choice is about controlling a key operating parameter (not just inspection or infrequent cleaning). • Ask whether the stated temperature or flow rate in the options is realistic for efficient lube oil separation in a shipboard centrifuge. • Eliminate any option that would overload the centrifuge or only provide periodic visual checks without affecting real-time separation.