Immediate Lethal Zone — Fireball Radius Typical range: 160–820 ft Hazards: Total engulfment by fireball Instantaneous fatal thermal exposure Tank shell fragmentation begins here Used for: absolute exclusion zone. Severe Burn Zone — High Thermal Radiation Typical range: 820–1,300 ft Thermal radiation: ~12.5–37.5 kW/m² Effects: Third‑degree burns in seconds Ignition of combustibles Structural damage Used...