Hazard and Risk 08
Hazard and Risk 08 : Types of Explosions: (1) Deflagration: The chemical reaction of a substance in which the reaction front advances into the unrelated substance at less than sonic velocity. Where a blast wave is produced which has the potential to cause damage, the term explosive deflagration is usually used. (2) Detonation: An explosion caused by the extremely rapid chemical reaction of a substance in which the reaction front advances into the unrelated substance at greater than sonic velocity. (3) Confined Explosion: An explosion of a fuel-oxidant mixture inside a closed system (e.g. vessel or building). (4) Vapour Cloud Explosion (VCE): The preferred term for an explosion in the open air of a cloud made up of a mixture of a flammable vapour or gas with air. (5) Unconfined Vapour Cloud Explosion (UVCE): Defined as for VCE above and is an imprecise term. (5) Pressure Burst: The rupture of a system under pressure, resulting in the formation of a blast wave and missiles, which may have the potential to cause damage. (6) Rapid Phase Transition: The rapid change of state of a substance, which may produce a blast wave and missiles. (7) BLEVE: Used to describe the sudden rupture of a vessel/system containing liquefied flammable gas under pressure due to fire impingement. The pressure burst and the flashing of the liquid to vapour creates a blast wave and potential missile damage, and immediate ignition of the expanding fuel-air mixture leads to intense combustion creating a fireball.
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