27. Why is it important for double bottom fuel oil tanks not to be topped off when loading fuel at cold temperatures?

Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened.
Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill.
Air pockets may cause the fuel to bubble out of the ullage hole.
A temperature rise of the fuel will cause an overflow from the tank vent.

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