Class 2 (2nd Engineer) MEKG 📅 Mar 2025

Exam Question

(a) Describe the preparation necessary before the application (in dry dock) of sophisticated or approved long life coating to the underwater surface of the hull. (6)

(b) State the significance of the roughness profile. (5)

Reference Answer

### (a) Preparation Necessary Before Application of Long Life Coating
The preparation of the underwater hull surface is the most critical stage in ensuring the adhesion, longevity, and performance of a sophisticated long-life coating system. The objective is to produce a clean, dry surface, free of contaminants, with a specified roughness profile. The process involves the following key stages:
1. **High-Pressure (HP) Freshwater Washing:**
* **Purpose:** To remove all marine biological fouling (slime, algae, barnacles), loose or flaking paint, dirt, and especially, soluble salt contamination from the hull.

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