Risk Assessments

Risk assessment techniques are regularly used to determine the acceptable levels of risk and to highlight those risks which are most likely to occur.

A full range of techniques are used from review and audit including HAZID, ENVID, HAZOP, CHAZOP, etc,  to consequence modelling using PHAST, CIRRUS, FRED etc, to more complex assessments using computational fluid dynamics (CFD), air dispersion modelling and mathematical modelling.

Also included in this section is the field of environmental risk assessment and implementation of techniques/methods to remove or minimise the release of emissions at the source. This can be integrated into the project to ensure that the development is in compliance with regulatory and company standards.

The risk assessment techniques have been used on a wide variety of projects ranging from offshore platforms and developments to onshore oil and gas terminals, to petrochemical and pharmaceutical facilities.

A technique that is increasing in popularity is the bowtie risk assessment approach.  These are often produced to provide a visual understanding of the threats and consequences that will result should a specific event occur. Barriers are identified and implemented to reduce the probability of the event occurring from a particular threat. Defences are provided to reduce the effect of each consequence.  These barriers and defences can then be checked for their effectiveness against each path. This technique can be used to identify if insufficient protective barriers or defences have been provided. In some cases too many protective systems are provided resulting in higher project cost. This approach can allow ALARP assessments to be determined and evaluated for Safety Case justifications.

For further information or a demonstration please contact Hill Consultants.

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