Class 4 (4th Engineer) MEKG 📅 Sep 2022

Exam Question

With reference to the impressed current method of protecting a ship's hull from corrosion.

(a) Sketch and describe a fully automated impressed current system. (5)

(b) (i) Sketch a simple transverse section of the hull and show the direction of current flow through the system and hull. (3)

(ii) How are the propulsion and maneuvering systems protected from corrosion in this arrangement. (3)

Reference Answer

### (a) Fully Automated Impressed Current System
A fully automated Impressed Current Cathodic Protection (ICCP) system is designed to continuously and automatically protect a ship's hull from electrochemical corrosion by impressing a controlled DC current, thereby making the entire wetted surface of the hull a cathode.
**Components of the System:**
1. **Power Supply Unit (Transformer/Rectifier):** As stated in the provided reference, a source of direct current is required. This unit converts the ship's AC supply (e.g., 440V) to a low-voltage, high-amperage, controlled DC output. It is the heart of the system, providing the power for protection.

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