HFL Consulting (now part of SLR)

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Under the COMAH Regulations, operators must demonstrate that the risks to employees in offices and other workplaces on site are as low as reasonably practicable (ALARP).

Many major incidents that have occurred on sites have resulted in serious harm to people in buildings, e.g. due to partial building collapse, or the generation of missiles or glass fragments. In many cases, the effects have been more severe than if the people were located in the open air and involved populations that did not necessarily need to be within such a close proximity to process equipment.

Occupied building risk assessment (OBRA) is the tool most commonly used to assess the risks to people located within buildings on-site. The approach requires knowledge of the potential effects of a major accident hazard (MAH) on a specific building against the likely building performance and ability to enact emergency response, e.g. the ability to shelter or escape an area.

This webinar aims to provide an overview of OBRA and the recent changes to the guidance in 2020.

Who should attend?

The webinar is open to personnel from manufacturing, storage or distribution companies who require an understanding of the output of occupied building risk assessments (OBRA). It will also provide a useful overview for those who are involved in undertaking OBRAs.

Date & Time

6th July 2021

1pm – 2pm


David Clark, Associate Consultant, SLR Consulting

David is a process safety and environmental consultant. He specialises in quantified risk assessments, including occupied building risk assessments and consequence modelling. He has written technical reports for clients in the chemicals, energy, explosives, oil & gas, pharmaceutical and warehousing industries.