USCG Exam PracticeLube oil and fuel oil systems
A centrifuge is being configured to process lube oil that contains both free water and solid contaminants. Which operational mode and associated requirement applies?
- A. Clarifier mode; no water seal is needed because solids are the only target
- ✓ Purifier mode; a liquid seal must be established by priming with fresh water before oil is admittedCorrect
- C. Purifier mode; the bowl must be primed with fuel oil to establish the correct density interface
- D. Clarifier mode; a gravity ring sized to the oil density must be installed to retain the water phase
Why B is correct
NAVEDTRA 14075 §3-4 states that a centrifuge run as a purifier separates water as well as solids and requires a liquid seal (water dam) established by priming with fresh water before oil is admitted. A clarifier removes only solids and uses no water seal.
Cited:NAVEDTRA 14075 §3-4