🔍 Key Concepts

• Centrifugal purifier operation – how separation between fuel and water/solids actually occurs • Ring dam (gravity disc) – what changing its size or diameter changes inside the bowl • Relationship between fuel density/specific gravity vs. water and the location of the interface layer in a separator

💭 Think About

• In a centrifugal purifier, what physical property of the fuel controls where the interface between fuel and water will sit inside the bowl? • Does the amount of water or dirt present change where that interface level needs to be set, or only how much is discharged? • If the ring dam (gravity disc) is too large or too small for the fuel being used, what happens to the interface position and the quality of separation?

✅ Before You Answer

• Be clear on the difference between viscosity (thickness/flow resistance) and specific gravity (density compared to water). Which one sets separation layers in a centrifuge? • Remember the ring dam’s job is to fix the interface level between water and oil – think which fuel property that depends on. • Check which options describe a variable property that requires selecting a matching gravity disc size when you change fuel type.