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Class 2 (2nd Engineer) MEKG 📅 Oct 2025

Exam Question

Discuss the causes of corrosion and the means by which corrosion of the following may be limited by manufacturers and ship's personnel respectively:

(a) Internal and external surfaces of auxiliary steam lines. (4)

(b) External surfaces of auxiliary boilers. (4)

(c) Water boxes of seawater coolers and condensers. (4)

(d) Main sea water inlet pipes. (4)

Reference Answer

### (a) Internal and External Surfaces of Auxiliary Steam Lines
#### (i) Internal Surfaces
**Causes of Corrosion:**
* **Dissolved Gas Attack:** Oxygen (O₂) and Carbon Dioxide (CO₂) entrained in the feedwater and carried over with the steam are the primary causes.

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