Floating roof tanks are designed with roofs that...

Floating roof tanks are designed with roofs that...

• A. Have a roof that floats on the liquid to reduce vapor loss
• B. Have fixed roofs only
• C. Are always made of wood
• D. Require no maintenance

Answer: (A)

Floating roof tanks use a buoyant roof that sits on the surface of the stored liquid and rises or falls with the liquid level. This design minimizes vapor losses because most of the vapor space above the liquid is displaced by the floating roof, and a sealing system around the rim reduces evaporation as the roof moves. This approach is different from fixed roofs, which do not move with changes in liquid level, and it isn’t defined by the material or by being maintenance-free. The roof’s buoyancy and edge seals are the defining features that help control vapor loss.

Floating roof tanks use a buoyant roof that sits on the surface of the stored liquid and rises or falls with the liquid level. This design minimizes vapor losses because most of the vapor space above the liquid is displaced by the floating roof, and a sealing system around the rim reduces evaporation as the roof moves. This approach is different from fixed roofs, which do not move with changes in liquid level, and it isn’t defined by the material or by being maintenance-free. The roof’s buoyancy and edge seals are the defining features that help control vapor loss.