Category: General

When the explosion occurs in an open area without obstacles

Individual Risk measures the risk to an individual or to a group with the same exposure profile to the hazards.

The IR is expressed in units of probability per annum. The accepted index for acceptable risk is the probability of injury of 1e-6 years, namely a risk of 1 in a million years

Location specific risk is the risk of fatality from all hazards to an individual spending 100% of the time in a fixed location and assumed to be outside.

The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit. Above this level, the mixture is too “rich” to burn.

The minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air is defined as the Lower Explosive Limit for that gas. Below this level, the mixture is too “lean” to burn