Tankerman · Transfer — Gauging
The 'ullage' of a cargo tank is the:
- ADepth of cargo measured from the tank bottom
- BEmpty space measured from the cargo surface to a reference point at the top✓ Correct
- CTemperature of the cargo
- DVolume of water bottoms
Explanation
Ullage is the distance from the liquid surface up to the reference (datum) point. Sounding is the opposite — depth of liquid from the bottom. Ullage decreases as the tank fills.
Authority: Tank Vessel Operations (USCG topic)
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