Most liquefied gas cargoes are flammable, and are carried at or close to their boiling point. What will happen if they are released into the atmosphere?
• Behavior of liquefied gas cargoes when pressure is released • Difference between flammability and freezing/expansion hazards • Conditions needed for a fire or explosion (fire triangle: fuel, oxygen, ignition)
• When a liquefied gas at or near its boiling point is suddenly exposed to atmospheric pressure, what happens to its temperature and state (liquid/gas)? • Which of the choices actually relates to what occurs in the atmosphere right after release, rather than inside the tank or over a long time? • Which option describes something that only happens if additional conditions are met (like certain concentration in air and another energy source)?
• Identify which options talk about events inside the tank/system versus what happens in open air on release • Check which choice correctly includes required conditions (concentration range and ignition) for a flammable gas to burn • Eliminate any option that confuses thermal effects (freezing/structural damage) with the immediate behavior of gas when it mixes with air
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