Pick out the wrong statement. A. Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?
Correct answer: A. Cooling and freezing of water kills the bacteria present in it
- A. Cooling and freezing of water kills the bacteria present in it
- B. With increasing boiler operating pressure of steam, the maximum allowable concentration of
- C. silica in feed water goes on decreasing
- D. Dissolved oxygen content in high pressure boiler feed water should be nil
Explanation
Cooling or freezing does not reliably kill all bacteria, so statement a is wrong. Silica limits become stricter at higher pressure, and dissolved oxygen should be essentially eliminated from high-pressure boiler feedwater to prevent corrosion.
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