🔍 Key Concepts

• High-speed rotating machinery and what happens if covers or bowls are opened while still spinning • How the bowl seal liquid works in a fuel oil purifier/clarifier and when it is normally lost or discharged • The relationship between the bowl, discs, and bearings in a centrifuge and what type of damage or hazards can occur during shutdown and cleaning

💭 Think About

• When you start to disassemble or clean this unit, which part of the machine are you directly exposing or loosening, and what is it doing while the machine is still rotating? • Which of the listed consequences would most logically occur immediately if you began opening or handling the bowl before it came to rest? Think about physical forces, not long-term cleanliness. • Look at the pathways for fuel, clean oil, and seal water in the illustration: which of these flows is most affected by centrifugal force versus gravity when the bowl is spinning?

✅ Before You Answer

• Identify which parts in the illustration are moving vs. stationary during operation and what would happen if a moving part is disturbed. • Decide which answer choice describes a result that would be sudden and mechanical rather than gradual or operational. • Confirm your choice by asking: "If I opened or disturbed a still-spinning bowl at high RPM, what is the most critical immediate risk to personnel and equipment?"