USCG Exam PracticeBearings, lubrication, and care of machine parts
When a lube-oil 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 clarifier uses a water seal to remove both water and solids.
- ✓ A purifier establishes a liquid water seal to separate both water and solids; a clarifier removes solids only and uses no water seal.Correct
- C. A purifier heats the oil to a higher temperature than a clarifier to reduce viscosity for water removal.
- D. A purifier uses a smaller gravity ring than a clarifier so that oil throughput is increased.
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, while a centrifuge run as a clarifier removes only solids and uses no water seal.
Cited:NAVEDTRA 14075 §3-4