LGTCO/LGTF Exit Exam • Set 4 Question 10 of 30
What operation is done on fully refrigerated gas carriers before gassing up after drydock?
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Direct Answer
Option B: Inerting
After drydock (when tanks contain air), tanks must be dried and inerted with inert gas or nitrogen to lower oxygen levels below 8% (typically <5%) prior to introducing flammable cargo gas.
All Options
A
Drying only
B
Inerting
(Correct Answer)
C
Cooling down
D
Aerating
Detailed Explanation & Context
After drydock (when tanks contain air), tanks must be dried and inerted with inert gas or nitrogen to lower oxygen levels below 8% (typically <5%) prior to introducing flammable cargo gas.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).
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