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Major hazard installations such as gas terminals and refineries will typically have several buildings located within their boundaries. Often this is to support workers being located close to the hazards that they are managing without exposing them to undue risk.  As such, it is important that operators recognise their responsibility and ensure these buildings – normally referred to as ‘occupied buildings’ – are designed considering the hazards within their vicinity. These buildings should provide the necessary protection to their occupants should an accident occur. On the other hand, it is important to note that if the building did not exist, the case for their workers being located on the facility – typically for up to 12 hours at a time – may not have been supported from a risk tolerability perspective.

An occupied buildings risk assessment (OBRA) is a natural input in the process of specifying buildings and demonstrating that risks to workers are as low as reasonably practicable (ALARP).

Safeti – DNV’s solution for consequence and risk modelling of loss of containment events – is tailored for safety professionals responsible for performing OBRA.

Define occupant vulnerability based on a building's design

Safeti supports multiple building types*, enabling users to determine risks for existing buildings or perform sensitivities for a range of building designs in your project.

Support for TNO multi-energy and BST explosion methods

Safeti supports the popular TNO multi-energy (ME) and Baker-Strehlow-Tang (BST) explosions methods, as well as import of your own explosion modelling data for use in risk calculations.

Comply with industry guidance

Whether you’re adopting a consequence-based or a risk-based approach, Safeti allows you to comply the industry guidance such as:

With outputs such as location-specific individual risk (LSIR) contours, potential loss of life (PLL), individual risk (IR) at specific locations, frequency contours for given effects*, and excedance curves*, Safeti gives you the metrics you need to meet your obligations.

Locate or specify your buildings

Whether it is to decide on a location for a new building, specify its required blast resistance or review the risks of an existing building, Safeti makes this easy. 

Thermal radiation and overpressure excedance curves, frequency contours and risk contours allow you to plan ahead and make the right decisions.

*Safeti Explosions extension required. Click here for more details.

Explore our software solution:



Make cost-effective decisions and manage risk throughout the asset lifecycle.

Discover other applications of our software:


Hydrogen consequence and risk modelling

Guidance on modelling hydrogen releases using Phast and Safeti software.


CO2 consequence and risk modelling

Guidance on modelling carbon dioxide (CO2) releases using using Phast and Safeti software.


Consequence estimation

Perform comprehensive consequence analysis and visualization for safety studies such as HAZOP, HAZID, PHA, and LOPA using the Phast software.


Accident & incident investigation

Assess hazardous material releases, identify root causes, and develop preventive measures using the Phast software.


Regulatory compliance

Evaluate and manage consequence and risks associated with hazardous materials and operations for regulatory compliance using the Phast and Safeti software.


Emergency response

Simulate consequences from loss of containment scenarios to aid in the development of effective emergency response plans using the Phast software.

What can Safeti software do for your company?

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