Once the hazards have been identified they need to be assessed. There are three elements to this. Severity, Extent and Frequency.
Severity and Extent can sometimes be determined qualitatively by reference to written 'good practice. Sometimes it can be determined through experience and judgement (ours and yours).
At other times, particularly for high or borderline risk scenarios, science needs to be applied and complex fire, explosion and toxic consequence calculations need to be prepared. These are not as onerous as it sounds and we use the industry leading modelling software DNV-PHAST for most of our modelling requirements.
There is a great deal of published information on equipment failure rates. There are recognised techniques for taking into account human error probalities. We have the competence to use all this data to build up a realistic and robust estimation of event Frequency.
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FREE ADVICE - CEDL holds a free advice surgery every Friday morning relating to the hazards of storing, handling and processing of flammable, toxic and explosive substances. Engagement is by telephone, Skype or in person (The Heath Runcorn) and we work to 30 minute slots from 0900hrs. To book your place, please email email@example.com and indicate the date and time that would suit you best.