To study the impact of accidental release of 1.6 tons of Chlorine gas in surrounding areas from a horizontal cylindrical tank lasting for one hour.
The impact is studied using standard Gas Dispersion modeling techniques considering various locations with different surface conditions in different seasons and meteorological conditions. The affected areas which are harmful to human exposures at different levels are detected. The affected areas are divided into three level of concerns namely red zone, orange zone, yellow zone.
The length of red zone (average chlorine concentration in 60 minutes is more than 20 ppm) has been estimated to be 1.1 kilometers, Orange zone (average chlorine concentration in 60 minutes is more than 2 ppm) 3.6 kilometers and yellow zone (average chlorine concentration in 60 minutes is more than 0.5 ppm) 7 kilometers, respectively downwind from the source. With all other conditions constant, a threat zone is likely to be smaller with increasing ground roughness and wind velocity. The length of a threat zone is likely to rise with increasing temperature as temperature affects atmospheric stability