What is a characteristic of Boiling Liquid Expanding Vapor Explosion (BLEVE)?

• A. It involves solid phases
• B. It occurs with boiling liquids under pressure
• C. It produces safe and non-hazardous vapors
• D. It is a slow reactive process

Answer: (B)

A Boiling Liquid Expanding Vapor Explosion (BLEVE) is characterized by the occurrence of boiling liquids under pressure. This phenomenon typically happens when a vessel containing a liquid that is at a temperature above its boiling point experiences a failure, often due to heat exposure. When the vessel integrity is compromised, the liquid rapidly vaporizes, leading to an explosive expansion of vapor. This process is particularly dangerous with pressurized liquefied gases, which can result in catastrophic explosions if the vapor is released suddenly.

The emphasis on boiling liquids under pressure is crucial because it highlights the conditions necessary for a BLEVE to occur—specifically, the relationship between pressure, temperature, and phase change. Understanding this characteristic allows responders to better assess and mitigate risks associated with hazardous materials during an incident involving high-pressure systems.