Class 2 (2nd Engineer) MEKG 📅 Aug 2025

Exam Question

Discuss 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.

(b) External surfaces of auxiliary boilers.

(d) Main sea water inlet lines.

Reference Answer

A comprehensive strategy involving both design choices by the manufacturer and diligent operational practices by ship's personnel is essential to limit corrosion in critical shipboard systems. The approach varies depending on the system, the materials involved, and the corrosive environment.
### (a) Internal and External Surfaces of Auxiliary Steam Lines
**1. Internal Surfaces**
*Internal corrosion is primarily caused by impurities and dissolved gases (Oxygen, Carbon Dioxide) in the steam, and the accumulation of corrosive condensate.*

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