Which statement about ullage measurements is true?

Which statement about ullage measurements is true?

• A. Ullage is not used in cargo calculations
• B. Ullage measures the distance from the bottom to the liquid surface
• C. Ullage measures the distance from the liquid surface to the top of the tank
• D. Ullage measures the total tank volume

Answer: (C)

Ullage is the empty space above the liquid inside a tank. The measurement is the distance from the surface of the liquid up to the top of the tank. This empty space, combined with the tank’s geometry and calibration charts, lets you determine how much cargo is actually in the tank. It’s the opposite of liquid depth, which would be the distance from the bottom of the tank up to the liquid surface. The total tank volume is the tank’s fixed capacity, not the ullage itself, though ullage is needed to translate capacity into the actual amount of liquid present. So the statement that ullage measures the distance from the liquid surface to the top of the tank is the correct description.

Ullage is the empty space above the liquid inside a tank. The measurement is the distance from the surface of the liquid up to the top of the tank. This empty space, combined with the tank’s geometry and calibration charts, lets you determine how much cargo is actually in the tank. It’s the opposite of liquid depth, which would be the distance from the bottom of the tank up to the liquid surface. The total tank volume is the tank’s fixed capacity, not the ullage itself, though ullage is needed to translate capacity into the actual amount of liquid present. So the statement that ullage measures the distance from the liquid surface to the top of the tank is the correct description.