What is the upper explosive limit (UEL) of methane in air?
Direct Answer
Option D: Approximately 15%
The Upper Explosive Limit (UEL) of methane is approximately 15% by volume in air. Understanding the flammable range, defined by the LEL and UEL, is vital for gas tanker safety, as it dictates the requirements for inerting, purging, and gas-freeing operations as outlined in the SIGTTO guidelines.
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Detailed Explanation & Context
The Upper Explosive Limit (UEL) of methane is approximately 15% by volume in air. Understanding the flammable range, defined by the LEL and UEL, is vital for gas tanker safety, as it dictates the requirements for inerting, purging, and gas-freeing operations as outlined in the SIGTTO guidelines.
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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