What sign may indicate a BLEVE risk?

• A. Cool spots on the tank surface
• B. Strong odor of gas
• C. Flame impingement on a tank
• D. Clear skies above the tank

Answer: (C)

A Boiling Liquid Expanding Vapor Explosion (BLEVE) is a serious risk associated with pressurized tanks, particularly those containing liquefied gases. The presence of flame impingement on a tank is a critical indicator of BLEVE risk. When flames directly contact the surface of a tank, the temperature can rise significantly, causing the contents of the tank to boil and generate a rapid buildup of pressure inside. If this pressure exceeds the tank's structural limits, it can result in a catastrophic failure, leading to an explosion or violent release of materials.

Recognizing this risk is essential for responding personnel, as it necessitates immediate action to cool the tank and mitigate the fire hazard. Proper training emphasizes the importance of monitoring for flame impingement, as well as other potential signs of overheating that may compromise the integrity of the vessel. In the context of hazard assessments, awareness of flame contact is imperative for ensuring safety during hazmat incidents.