Which of the following best describes a BLEVE?

• A. A chemical reaction causing combustion
• B. An explosion due to rapid vaporization of a liquid
• C. A fire caused by an over-pressurized vessel
• D. A heat-induced reaction within an airtight container

Answer: (B)

The best description of a BLEVE (Boiling Liquid Expanding Vapor Explosion) is that it refers to an explosion resulting from the rapid vaporization of liquid, which typically occurs when a vessel containing liquid is subjected to heat and fails. In a BLEVE, the pressure within the container increases as the liquid heats up and begins to vaporize. When the pressure exceeds the strength of the container, it ruptures, releasing the liquid and vapor. This sudden release allows the vapor to mix with air and ignite, potentially causing a fireball or explosion.

Understanding this phenomenon is crucial for HAZMAT operations, as BLEVEs can occur with pressurized liquid storage, particularly with flammable liquids. This fast transition from liquid to vapor and explosive release highlights the importance of managing thermal and pressure conditions in hazardous materials scenarios.