Before gas freeing operations the hydrocarbon content is reduced to:
Direct Answer
Option D: to 2% or less by volume
Before commencing gas freeing, the hydrocarbon content in a tank must be reduced to 2% or less by volume. This is a critical safety measure, as stipulated by ISGOTT, to ensure the tank atmosphere is below the Lower Explosive Limit (LEL) and safe for introducing fresh air without creating a flammable mixture.
All Options
Detailed Explanation & Context
Before commencing gas freeing, the hydrocarbon content in a tank must be reduced to 2% or less by volume. This is a critical safety measure, as stipulated by ISGOTT, to ensure the tank atmosphere is below the Lower Explosive Limit (LEL) and safe for introducing fresh air without creating a flammable mixture.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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