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Class 4 (4th Engineer) MEKG 📅 Dec 2024

Exam Question

(a) What is meant by the term 'purification' and what does it 'separate'? (3)

(b) What are the basic methods of 'separation'? Explain the functioning of 'purifier' and 'clarifier'? (3)

(c) What is meant by the term 'interface' and what is the role of 'gravity disc'? in determining the same (4)

(d) What is 'NOMOGRM' and how correct 'gravity disc' size is selected (6)

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Reference Answer

### (a) Definition of 'Purification' and what it 'Separates' (3 Marks)
**Purification**, in the context of marine engineering, refers to the mechanical process of treating liquids like fuel oil or lubricating oil to remove harmful contaminants. It is a specific application of centrifugal separation designed to handle a three-phase system: a primary liquid (oil), an immiscible secondary liquid of different density (water), and suspended solid particles (sludge, catfines, metallic particles, etc.).
The process 'separates' the following:
1. **Two Mutually Insoluble Liquids:** It separates liquids that do not mix, primarily water from oil. Water can be fresh or salt, originating from condensation, tank leakages, or as emulsified water within the fuel delivery.

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