Class 2 (2nd Engineer) MEKG 📅 Apr 2023

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.

(b) State the significance of the roughness profile.

Reference Answer

### (a) Preparation for Application of Sophisticated Hull Coating
Preparation of the underwater hull surface is the most critical stage for ensuring the adhesion, longevity, and performance of a sophisticated long-life coating system. The process, conducted in dry dock, must be meticulously controlled and inspected at each stage. It comprises the following key steps:
**1. High-Pressure Fresh Water Washing:**
* **Objective:** To remove all marine biological fouling (slime, algae, barnacles), loose paint, and especially, soluble salts like chlorides and sulphates which are trapped in the paint film and on the steel surface.

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