Which statement about lifter roof tank capacity is true?

Which statement about lifter roof tank capacity is true?

• A. Capacity is fixed
• B. Capacity is greater than 2 million gallons
• C. Capacity varies due to construction
• D. Capacity equals that of a floating roof tank

Answer: (C)

Capacity depends on the tank’s physical size and how it’s built. A lifter roof tank isn’t produced to a single, fixed volume; its interior volume varies with the tank’s diameter, height, and any internal features chosen during construction. Because different installations are built to different specifications, their capacities differ. So the statement that capacity varies due to construction is the best answer. The other options assume a universal size or a relationship to other roof types that isn’t guaranteed by the design.

Capacity depends on the tank’s physical size and how it’s built. A lifter roof tank isn’t produced to a single, fixed volume; its interior volume varies with the tank’s diameter, height, and any internal features chosen during construction. Because different installations are built to different specifications, their capacities differ. So the statement that capacity varies due to construction is the best answer. The other options assume a universal size or a relationship to other roof types that isn’t guaranteed by the design.