What is the primary purpose of outage (ullage) space inside a liquid cargo tank?

What is the primary purpose of outage

Multiple choice — select the best answer

ATo provide room for cleaning equipment during washouts
BTo improve fuel efficiency by keeping the tank lighter
CTo give the driver a visual reference for measuring fill level
DTo allow liquid to expand as temperature increases without overpressurizing or overflowing the tank

✓ Correct answer: D. To allow liquid to expand as temperature increases without overpressurizing or overflowing the tank The CDL manual explains that outage is the space left unfilled so that liquid can expand with heat without rupturing the tank or spilling through vents.

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What is the primary purpose of outage (ullage) space inside a liquid cargo tank?

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