OCTCO/OCTF Exit Exam • Set 8 Question 16 of 30
With reference to liquefied gas operation, what is the term “rollover” used to describe?
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Direct Answer
Option A: When two or more stratified layers of different density LNG in the same tank suddenly mix together causing
Rollover in liquefied gas tankers refers to the sudden spontaneous mixing of stratified LNG layers of different densities, resulting in rapid boil-off vapour release.
All Options
A
When two or more stratified layers of different density LNG in the same tank suddenly mix together causing
(Correct Answer)
B
Vapor pockets forming at the bottom of a half-filled tank
C
Custody transfer at the terminal
D
Moving LNG from one tank to another
Detailed Explanation & Context
Rollover in liquefied gas tankers refers to the sudden spontaneous mixing of stratified LNG layers of different densities, resulting in rapid boil-off vapour release.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).
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