GASCO Exit Exam • Set 7 Question 2 of 30
In an LNG carrier mixtures of methane and air are avoided at all times. What is the reason?
✓
Direct Answer
Option B: Risk of fire or explosion
Methane-air mixtures within the flammable range (5% to 15% methane by volume) pose severe risks of fire and explosion, so tanks are inerted with inert gas or nitrogen before introducing air or cargo.
All Options
A
Dilution of cargo
B
Risk of fire or explosion
(Correct Answer)
C
Degradation of cargo quality
D
Ice formation in cargo
Detailed Explanation & Context
Methane-air mixtures within the flammable range (5% to 15% methane by volume) pose severe risks of fire and explosion, so tanks are inerted with inert gas or nitrogen before introducing air or cargo.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO).
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