USCG Exam PracticeLube oil and fuel oil systems
When a centrifuge is operated as a purifier rather than a clarifier, what is the primary operational difference?
- A. A purifier uses higher bowl speed to remove solids only
- ✓ A purifier requires a water seal (gravity ring) to separate water as well as solidsCorrect
- C. A purifier heats the oil to a higher temperature than a clarifier
- D. A purifier discharges clean oil outward while solids move inward
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