Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs?
Correct answer: C. Floating
- A. Conical
- B. Flat
- C. Floating
- D. Fixed
Explanation
Floating roofs are used for volatile liquids such as naphtha because they move with the liquid level and greatly reduce the vapour space and evaporation losses. Fixed or conical roofs retain a larger vapour space above the liquid.
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