Where should streams be directed to prevent a BLEVE?

Directing streams at the area where the tank is being heated is essential in preventing a Boiling Liquid Expanding Vapor Explosion (BLEVE). When a tank containing liquefied gas is subjected to excessive heat, the internal pressure rises, which can lead to a rupture if the pressure relief systems, like relief valves, fail. By applying water directly to the hottest areas of the tank, it helps to cool the tank's surface, thereby reducing the risk of the gas inside reaching critical temperatures that could lead to an explosion.

Cooling the heated area effectively lowers the temperature of the liquid and vapor inside the tank, minimizing the chances of a BLEVE. This cooling strategy can buy precious time, allowing for the safe evacuation of personnel and potentially enabling fire suppression teams to take further action to secure the situation.

Directing streams onto the relief valve, tank ends, or protective dome might provide some level of protection or affect pressure release, but primarily cooling the area being heated is the most effective method to prevent a BLEVE scenario from escalating into a catastrophic event.