Regarding cordons, the distances provided in ERG are very large and may not be practical in a highly populated area. Where times are given for tank failure or tank emptying through the pressure relief valve, the times provided in the ERG are typical but they can vary from situation to situation. The information provided is for guidance and should only be used where there is no specialist advice or site-specific information. Guidance on BLEVE hazard areas, evacuation distances, tank properties, critical times and cooling water flow rates for various tank sizes can be found in the Emergency Response Guide (ERG). Most flame-induced liquefied gas BLEVEs occur when half to three-quarters of the liquid remains in the container.įor further details on a BLEVE, its causes and effects, refer to Foundation for Hazardous Materials. Generally speaking, the bigger the container, the bigger the BLEVE. The size of the BLEVE depends on the size and weight of the container, along with the amount of liquid that remains inside the container at the moment of the BLEVE. Projectiles are the hazards with the greatest reach. The danger from these hazards decreases further away from the BLEVE centre. The main hazards from a BLEVE involving a flammable gas are:
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