Class 4 (4th Engineer) MEKG 📅 Nov 2023

Exam Question

(a) Explain with reasons, as to why 'boiler water testing' is carried out on board. (6)

(b) Explain procedure for collecting boiler water sample? State precautions? (4)

(c) Mention with procedure and recommended values for the tests which need to be carried on boiler water as a routine. (6)

Reference Answer

### (a) Reasons for Boiler Water Testing (6 Marks)
Boiler water testing is a critical preventative maintenance task carried out to ensure the safe, efficient, and long-term operation of the boiler. The primary objectives, based on fundamental chemical and physical principles, are to prevent scale formation, corrosion, carryover, and catastrophic failure.
1. **Prevention of Scale Formation:**
* **Reasoning:** Untreated feed water contains dissolved mineral salts, primarily Calcium (Ca) and Magnesium (Mg) compounds, which cause 'hardness'. At high temperatures and pressures inside the boiler, these salts precipitate out of solution and form hard, crystalline deposits on heat transfer surfaces (tubes, furnace walls). This is known as scale.

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