Question 1557 Deck General

70% to pass

With reference to Liquefied Gas operations, what does the term "rollover" used to describe?

A custody transfer at the terminal
B vapor pockets forming at the bottom of a half-filled tank
C when two or more stratified layers of different density LNG in the same tank suddenly mix together, causing a rapid increase in boil-off vapors
D moving LNG from one tank to another
AI Explanation

The correct answer is C) when two or more stratified layers of different density LNG in the same tank suddenly mix together, causing a rapid increase in boil-off vapors. Rollover in the context of liquefied gas operations refers to the sudden mixing of two or more layers of LNG in a storage tank that have different densities. This can occur when temperature and density gradients develop in the tank, leading to the formation of distinct layers. If these layers suddenly mix, it can cause a rapid increase in boil-off vapors, which can create significant safety hazards. The other options do not accurately describe the meaning of "rollover" in liquefied gas operations.

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