What is purging on an oil tanker?
Direct Answer
Option C: Introducing inert gas into an inerted tank to reduce hydrocarbon concentration before gas freeing
Purging involves introducing inert gas into an already inerted cargo tank to displace and lower hydrocarbon gas concentrations below the critical dilution line prior to gas-freeing with air, as detailed in ISGOTT and Inert Gas Systems operational manuals.
All Options
Detailed Explanation & Context
Purging involves introducing inert gas into an already inerted cargo tank to displace and lower hydrocarbon gas concentrations below the critical dilution line prior to gas-freeing with air, as detailed in ISGOTT and Inert Gas Systems operational manuals.
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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