GASCO Exit Exam • Set 1 Question 17 of 30
Before gas-freeing a cargo tank that contained flammable gas, what step must be taken first?
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Direct Answer
Option C: Inert the tank with Nitrogen or inert gas until hydrocarbon content is below LFL
Purging flammable gas with inert gas prevents the atmosphere inside the tank from entering the flammable range when fresh air is later introduced.
All Options
A
Turn on electric deck heaters
B
Open all deck hatches immediately to fresh air
C
Inert the tank with Nitrogen or inert gas until hydrocarbon content is below LFL
(Correct Answer)
D
Fill the tank with sea water
Detailed Explanation & Context
Purging flammable gas with inert gas prevents the atmosphere inside the tank from entering the flammable range when fresh air is later introduced.
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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