Class 2 (2nd Engineer) MEKG 📅 Oct 2024

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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