What is the Lower Explosive Limit (LEL) of Methane gas in air?
Direct Answer
Option D: Approximately 5% by volume
Methane has a Lower Explosive Limit (LEL) of approximately 5% by volume in air. Below this concentration, the mixture is too lean to burn, whereas exceeding the LEL creates an immediate flammable hazard requiring rigorous gas-freeing and monitoring protocols.
All Options
Detailed Explanation & Context
Methane has a Lower Explosive Limit (LEL) of approximately 5% by volume in air. Below this concentration, the mixture is too lean to burn, whereas exceeding the LEL creates an immediate flammable hazard requiring rigorous gas-freeing and monitoring protocols.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).
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