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Class 4 (4th Engineer) SSEP 📅 Mar 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)

(c) Explain how oil density and temperature relate to separation. (4)

Exam question diagram

Reference Answer

### Part (a) Sketch of a Two-Stage Oily Water Separator
A simple line diagram is required. The key components to be shown are:
1. **Inlet:** From the Bilge Holding Tank.
2. **Pump:** A positive displacement pump (e.g., screw or reciprocating type) to prevent emulsification.

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