Class 4 (4th Engineer) MEKG 📅 Jul 2022

Exam Question

(a) Define the role played by the gravity disc and the way to determine its size for effective purification.

(b) Describe the Purifier safety system layout with a system schematic diagram, explaining how each of the safety devices keep the automatic purifier operation safe and trouble-free.

Reference Answer

### (a) Role and Sizing of the Gravity Disc
#### 1. Role of the Gravity Disc
The primary function of a centrifugal purifier is to separate two immiscible liquids of different densities and solid impurities. The efficiency of this separation is critically dependent on the position of the oil-water interface within the purifier bowl. The gravity disc plays the central role in establishing and maintaining this interface.
* **Interface Control:** The gravity disc acts as a discharge weir or dam for the separated water. The internal diameter of the gravity disc determines the radius of the water column within the rotating bowl. This, in turn, establishes a hydrostatic equilibrium between the oil column and the water column.

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