Class 4 (4th Engineer) SSEP 📅 Nov 2025

Exam Question

(a) Sketch a simple line diagram showing a shipboard oily water separator in series with a coalescing second stage. (8)

(b) Briefly describe the above arrangement and its operations; also state the allowable oil content in p.p.m. of the discharge effluent from such an arrangement. (8)

Reference Answer

### (a) Sketch of Oily Water Separator Arrangement
A simple line diagram should be drawn by the candidate. The sketch must clearly show the following components connected in the correct sequence:
1. **Suction Source**: Bilge Holding Tank.
2. **Pump**: OWS Feed Pump (positive displacement type, e.g., screw or reciprocating, to avoid further emulsification of oil).

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