Occupied Building Risk Assessment OBRA and Domino Effects

Occupied Building Risk Assessments are carried out in industries where there are major hazards to personnel, close to occupied buildings on or off site. Often as part of a client’s COMAH (Control of Major Accident Hazard) application process, a risk based OBRA will be required. This is to ensure personnel are adequately protected against fire and explosion events nearby.

Our OBRA Consultancy Services come in two forms:

• Hazard based OBRA – a shorter screening study

• Risk based OBRA – where a hazard based study has identified there is a risk to be concerned about, and more detailed analysis of the risk to personnel is required.

Occupied Building Risk Assessments are a highly specialised area, please get in touch if you would like to know more about our capabilities in this area and how we can assist with your major accident hazard compliance requirements.

All our modelling now uses DNV Phast consequence modelling software, for industry leading modelling output.

How does a Domino Effect Study differ?

A Domino Effect Study differs from an OBRA in that it doesn’t assess the risk of events, instead focusing on the potential consequence impacts both on and off site.  Domino Effect Studies can be wide ranging and are useful for CoMAH compliance where off site impacts need to be assessed.

As with OBRA, consequence modelling for Domino Effect Studies uses the latest DNV Phast software to determine the extents of fires, explosion and toxic gas releases.