Innage is used to determine which aspect of cargo quantity?

Innage is used to determine which aspect of cargo quantity?

• A. Vapor space
• B. Liquid depth
• C. Tank diameter
• D. Pressure

Answer: (B)

Innage is the depth of the liquid inside a tank—the distance from the tank bottom up to the surface of the cargo. This depth is the key measurement used to determine how much cargo is in the tank because the volume of liquid depends on how deep it sits in the tank’s geometry. Once you know the innage, you apply the tank’s calibration data (tables or charts for that specific tank shape) to convert that depth into the actual cargo quantity. Temperature and tank shape affect the exact volume, so charts often account for the tank geometry and may be adjusted for temperature to get accurate quantities. Vapor space, or ullage, refers to the empty space above the liquid, not the depth of the liquid itself, and thus isn’t what innage measures. Tank diameter describes the tank’s size but, by itself, doesn’t tell you how much cargo is present without knowing how deep the liquid is. Pressure is related to head and gas laws rather than the liquid depth inside the tank.

Innage is the depth of the liquid inside a tank—the distance from the tank bottom up to the surface of the cargo. This depth is the key measurement used to determine how much cargo is in the tank because the volume of liquid depends on how deep it sits in the tank’s geometry. Once you know the innage, you apply the tank’s calibration data (tables or charts for that specific tank shape) to convert that depth into the actual cargo quantity. Temperature and tank shape affect the exact volume, so charts often account for the tank geometry and may be adjusted for temperature to get accurate quantities.

Vapor space, or ullage, refers to the empty space above the liquid, not the depth of the liquid itself, and thus isn’t what innage measures. Tank diameter describes the tank’s size but, by itself, doesn’t tell you how much cargo is present without knowing how deep the liquid is. Pressure is related to head and gas laws rather than the liquid depth inside the tank.