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Class 2 (2nd Engineer) MEKG 📅 Jan 2019

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.

(b) External surfaces of auxiliary boilers.

(c) Water boxes of seawater coolers and condensers.

(d) Main sea water inlet pipes.

Reference Answer

(a) Internal and External Surfaces of Auxiliary Steam Lines:
Causes of corrosion in Internal Surface:
Water and oxygen in the steam can lead to corrosion through oxidation.
Carbon dioxide (CO2) in the air or steam dissolves to form carbonic acid, a corrosive agent.

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