Class 2 (2nd Engineer) SC&S 📅 Dec 2025

Exam Question

(a) Sketch the cross-section of a bulk carrier with either deep or shallow double bottom showing the type of framing used.

(b) (i) Describe the corrosion problems experienced with ballast tanks.

(ii) State how such tanks are protected against extensive corrosion.

Reference Answer

(a) Mid-ship section of bulk carrier:
(b) (i) Corrosion problems in ballast tanks are significant and arise due to various factors:
Galvanic corrosion occurs due to the interaction between dissimilar metals, accelerated by the seawater environment and differential aeration.
Sulphate-reducing bacteria in river mud can cause localized pitting, leading to penetration of the bottom shell.

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