Class 4 (4th Engineer) MEKG 📅 Nov 2025

Exam Question

With reference to auxiliary boiler water impurity define the effects of the following salts: (16)

(a) Calcium carbonate,

(b) Sodium chloride,

(d) Calcium sulphate,

Explain how the quantity of each is determined and controlled.

Reference Answer

### Introduction to Boiler Water Impurities
The presence of dissolved salts and impurities in auxiliary boiler feed water is a primary cause of operational problems, reduced efficiency, and catastrophic failure. Proper water chemistry management is essential for the safe and reliable operation of steam generating plants. The effects, determination, and control of specific salts are detailed below.
### (a) Calcium Carbonate (CaCO₃)
**Effects:**

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