Class 2 (2nd Engineer) MEP 📅 Jan 2024

Exam Question

Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, state with reasons:

(a) The possible causes of such leakage. (5)

(b) The effects of this leakage. (5)

Reference Answer

(a) The possible causes of such leakage
External wastage due to waterside corrosion and pitting caused by using bad quality feed water or improper boiler water treatment.
Wastage of the ligaments due to soot blowing with wet steam.
Due to local overheating or design fault, unequal thermal expansion between tube and tube plate

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