Scale formation in boiler is controlled by____________________?
Correct answer: D. Reduction in hardness, silica & alumina in feed water
- A. Preheating of feed water
- B. Eliminating H2S in feed water
- C. Keeping the pH value of feed water just below 7
- D. Reduction in hardness, silica & alumina in feed water
Explanation
Boiler scale forms mainly from hardness salts and deposits involving silica and alumina, so these species must be reduced in the feedwater. Preheating alone does not remove dissolved scale-forming impurities, and keeping the pH below 7 would promote corrosion.
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