The most detrimental impurity in high pressure boiler feed water is ___________________?
Correct answer: D. Silica
- A. Suspended salt
- B. Dissolved salt
- C. Turbidity
- D. Silica
Explanation
Silica is especially dangerous in high-pressure boilers because it can vaporize with steam and form hard, insulating deposits on turbine blades and heat-transfer surfaces. Ordinary suspended matter and turbidity are generally removed by pretreatment.
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