Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
Correct answer: A. Silica
- A. Silica
- B. Dissolved oxygen
- C. Suspended salt
- D. Dissolved salt
Explanation
Silica is especially harmful in high-pressure boilers because it forms hard deposits and can be carried with steam to foul turbine blades. Dissolved oxygen mainly causes corrosion, but silica is the more characteristic severe impurity in this comparison.
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