1 Introduction

A few examples have been taken for certain chemicals to show how the consequence analysis should be carried out. One chemical may result in different impacts zones hence analysis at one place should not be copied for the other places.

When a hazardous material escapes from its normal container due to some reason, it leads to the formation of gas, vapour, liquid or two-phase release. If the escaping fluid is combustible and an ignition source is present, a fire may occur. The situation may produce pool fire, jet fire, Boiling Liquid Expanding Vapour Explosion (BLEVE) etc. depending on the situation. If the ignition source is not present, the cloud gets diluted and blows off slowly. If the liquid is toxic, all living objects in the path of the cloud are exposed to toxic cloud.

The nature of the damage resulting from an accidental release of a chemical depends on several factors viz., nature of the material, storage condition, release condition, atmospheric condition etc. The best way of understanding and quantifying the physical effects of any accidental release of chemicals from their normal containment is by means of mathematical modelling, called Consequence Analysis (CA). Consequence analysis deals with the study of effects of potential dangers involved in accidental release of regulated chemicals. As far as chemical industries are concerned, there are two types of consequence analysis: On-site CA and off-site CA. Worst case release scenario and alternative case release scenario are the two basic elements of Consequence Analysis.

A flow chart for consequence analysis is shown as Fig -1.


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