What is the typical maximum oxygen content allowed in Nitrogen used for inerting gas tanks?
Direct Answer
Option B: 0.5% to 1.0% by volume
Inerting requires oxygen levels to be kept below the Limiting Oxygen Concentration (LOC) to prevent the formation of a flammable atmosphere. Maintaining oxygen between 0.5% and 1.0% provides a sufficient safety margin to ensure the atmosphere remains non-combustible during gas-freeing or purging operations.
All Options
Detailed Explanation & Context
Inerting requires oxygen levels to be kept below the Limiting Oxygen Concentration (LOC) to prevent the formation of a flammable atmosphere. Maintaining oxygen between 0.5% and 1.0% provides a sufficient safety margin to ensure the atmosphere remains non-combustible during gas-freeing or purging operations.
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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