What is a BLEVE?

What is a BLEVE?

• A. An explosion that occurs when pressurized liquefied materials inside a closed vessel are exposed to a source of high heat
• B. A rapid spread of flames through a building due to wind
• C. A process of heat transfer by direct contact
• D. A type of safety valve malfunction

Answer: (A)

The concept being tested is how a BLEVE forms: an explosion caused by heating a sealed vessel that contains pressurized liquefied gas. When exposed to high heat, the liquid inside boils, causing a rapid rise in vapor pressure. If the vessel fails or ruptures, that high-pressure vapor expands explosively, often throwing fragments of the container and creating a powerful blast. This description matches BLEVE precisely, which is why it’s the best answer.

The other scenarios describe different fire or heat-transfer phenomena: flames spreading rapidly through a building due to wind is a wind-driven fire or flashover, not a vessel explosion; heat transfer by direct contact is conduction, a separate heat transfer mode; a safety valve malfunction relates to valve issues rather than the explosive release from overpressurized liquid. In real-world safety, BLEVE risk involves pressurized liquefied gas containers, so preventing heating and keeping a safe distance are key precautions.