Which statement about storage tank designs is true?

Which statement about storage tank designs is true?

• A. Internal and external floating roof designs are common types
• B. All tanks are made of wood
• C. Tanks do not require inspection
• D. Tanks must be repainted every week

Answer: (A)

Floated-roof designs are used in storage tanks to minimize vapor losses and control safety by reducing the open space above the liquid. An internal floating roof sits inside the fixed shell and carries a deck that rises and falls with the liquid level, with seals to limit vapor escape. An external floating roof floats on the liquid surface with edge seals (and sometimes a secondary seal) to keep vapors in. Both configurations are common for storing volatile liquids because they combine a sturdy shell with a movable top that adapts to liquid level and reduces evaporation. Tanks aren’t made of wood; they’re typically metal or reinforced concrete, designed for strength and durability. Regular inspection is required to detect leaks, corrosion, and other hazards, and repainting every week isn’t a standard practice.

Floated-roof designs are used in storage tanks to minimize vapor losses and control safety by reducing the open space above the liquid. An internal floating roof sits inside the fixed shell and carries a deck that rises and falls with the liquid level, with seals to limit vapor escape. An external floating roof floats on the liquid surface with edge seals (and sometimes a secondary seal) to keep vapors in. Both configurations are common for storing volatile liquids because they combine a sturdy shell with a movable top that adapts to liquid level and reduces evaporation.

Tanks aren’t made of wood; they’re typically metal or reinforced concrete, designed for strength and durability. Regular inspection is required to detect leaks, corrosion, and other hazards, and repainting every week isn’t a standard practice.