A BLEVE (Boiling Liquid Expanding Vapor Explosion) is a major accident hazard in process safety. It happens when a vessel containing a liquid at a temperature well above its normal boiling point suddenly fails (usually due to fire impingement, overpressure, or material failure). What is BLEVE? Definition: The explosive release of pressurized liquid and vapor when a vessel ruptures. Cause: Rapid vaporization of the liquid due to sudden pressure loss, producing a violent blast and fireball if the