Final answer:
To prevent a BLEVE, streams should be directed towards the base of the fire and away from nearby tanks or containers. This helps to remove heat and prevent the liquid from reaching its boiling point.
Step-by-step explanation:
To prevent a BLEVE (Boiling Liquid Expanding Vapor Explosion), streams should be directed towards the base of the fire and away from any nearby tanks or containers. This is because a BLEVE occurs when a pressurized vessel containing a liquid above its boiling point ruptures, causing the rapid release and expansion of the liquid, leading to an explosion.
By directing the streams towards the base of the fire, the heat can be effectively removed, preventing further heating of the vessel and minimizing the risk of a BLEVE. It is also important to ensure that the streams are not directed towards any nearby tanks or containers, as the force of the water could cause them to rupture.
Overall, the goal is to cool the vessel and remove heat energy to prevent the liquid inside from reaching its boiling point and causing a BLEVE.