A Quantitative Risk Assessment (QRA) is a very detailed analysis of a process plant to ensure that the risk to neighbouring sites, plants or residences meet planning guidelines. A common requirement is that the fatality risk at nearby residential properties must not exceed 1 in a million per year (1 x 10-6 p.a.)

A QRA is commonly considered the best approach for modern complex processing facilities handling hazardous materials. The standard industry methodologies for QRA are presented in the following publications:

• ‘Guidelines for Chemical Process Quantitative Risk Analysis’, Centre for Chemical Process Safety, 2000
• ‘Guideline for Quantitative Risk Assessment ‘Purple Book’ CPR 18E’, VROM, December 2005.

The Bow-Tie Consulting personnel have developed QRA’s for a large number of process plants. This experience will ensure that your site is modelled at an appropriate level of detail. This will reduce the cost associated with the model development while still providing detailed models of the significant risks. This understanding allows future risk reduction actions to be targeted in the most effective manner possible.

There are many parts of a QRA, such as hazard identification and consequence modelling. We will help you in any or all of these aspects.