Question 1073 Deck General

70% to pass

Petroleum cargo tanks should not be topped off at deck level when loading on a cold day due to which of the following?

A air pockets may cause the cargo to bubble out of the ullage hole

B a subsequent temperature rise will cause the cargo to overflow

C the increased viscosity of the product requires higher loading pressure which increases the chances of a spill

D the tank valve may be stiff and a spill will occur before the valve can be closed

AI Explanation

The correct answer is B) a subsequent temperature rise will cause the cargo to overflow. When loading petroleum cargo on a cold day, the cargo tanks should not be topped off at deck level. This is because as the cargo warms up, it will expand and can cause the cargo to overflow from the tank. The increase in temperature leads to an increase in the volume of the cargo, which will then exceed the available tank capacity if the tank was filled to the deck level during the cold conditions. The other answer choices do not accurately describe the reason for this practice.

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