What is the danger of cold methane gas clouds near deck level?
Direct Answer
Option B: Cold methane is heavier than air initially, forming low flammable vapor clouds
Although methane is lighter than ambient air at standard temperatures, boil-off gas chilled to cryogenic temperatures becomes significantly denser than air. According to SIGTTO safety principles, these cold vapor clouds hug the deck and remain flammable within LEL/UEL ranges.
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Detailed Explanation & Context
Although methane is lighter than ambient air at standard temperatures, boil-off gas chilled to cryogenic temperatures becomes significantly denser than air. According to SIGTTO safety principles, these cold vapor clouds hug the deck and remain flammable within LEL/UEL ranges.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).
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