Control your hazards by knowing the consequences

Phast™ is a globally adopted solution for modelling discharge, dispersion, fires, explosions and toxic effects of a wide range of loss of containment scenarios.

Process safety professionals benefit from 40 years’ worth of development and validation by our industry experts and its continued use by more than 10,000 users across 1,000 organizations.

Optimise your design, validate your process and meet your safety obligations

Whether it's to design a flare stack, provide input to your HAZOPs or plan for emergencies, the Phast software gives you the tools to meet your goals and to have confidence in your work.

Communicate with your customers or stakeholders using Phast's presentation of key results in 2D graphs, a 3D viewer and in Word and Excel reports.

Solve a range of problems with a diverse set of scenarios and effects

Loss of containment scenarios from pressure vessels, storage tanks, pipework and pipelines are easy to create. Phast automatically determines the type and extent of the consequence effects. 

Within a matter of seconds, you can have the answer to the problem you are trying to solve.

Also supported are a range of "standalone" models, user-defined sources and adjustable parameters, giving you full control for specifying loss of containment scenarios.

Phast software extensions for in-depth analysis

Phast offers extensions that enhance modelling capabilities and provide deeper insight into the consequences of complex scenarios.

Multi-Component (MC) extension for advanced modelling of complex mixtures (e.g. two-phase releases).

Explosions extension brings analysis of explosions in three dimensions, directional modelling effects and visualisation of combined effect contours.

Computational Fluid Dynamics (CFD) extensions for modelling the impact of 3D geometries.

Phast pricing and licencing


Recommended when there is no need to share licenses.

Plans available for local installation on your PC or pre-installed on virtual machine. Access available from 1 day to 1 year for one single user.


Network (Concurrent)

Recommended when there is need for multiple users at the same time.

Access for multiple simultaneous users where the product license is installed on a network server and software installation on the individual user's machine.


Whether you're a new or an experienced user, we offer a variety of technical software courses to help you get the most out of our products. You can join us face to face, online or book a private training course.

Coogee logo

The modelling provided insights which will allow us to drastically reduce the cooling water demand for our new tank terminal.

  • Coogee
  • ,
  • a leading chemical manufacturing company

Join 1,000+ organizations using Phast to control hazards

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Frequently asked questions



Phast/Safeti calculates the discharge, dispersion and flammable and toxic effects associated with loss of containment scenarios. It can be used to model pool spreading and evaporation, fires (jet, pool and fireballs), explosions, BLEVE and toxic effects.


Phast is typically used in the following applications: 

  • ALARP demonstration 
  • Consequence estimation for HAZOP, HAZID, PHA, LOPA 
  • Consequence input to your own QRA tool 
  • Emergency response planning 
  • Equipment design Escalation assessment 
  • Extent and severity assessment 
  • Facility siting and layout optimisation 
  • Hazardous area classification 
  • Regulatory obligations (e.g. safety reports) 
  • Vent and flare design 
  • Other general consequence estimation


We offer a range of lease / subscription options from 1-day up to 3 years as well as perpetual. Lease / subscription options are available to purchase digitally using credit card or invoicing via our Veracity marketplace.

Lease / subscription and perpetual options are also available by speaking to a sales manager.

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Product information

  Product videos

Product videos

Watch our product videos to learn what our software can do for your company.

  Consequence and QRA webinars

Consequence and QRA webinars

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Find a course that suits your needs.

  Knowledge and support

Knowledge and support

Download latest versions, learn what's new and search the help library.

Discover 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.


Accident & incident investigation

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


Consequence estimation

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


Emergency response

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

Related products



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



Advanced dispersion, fire and explosion modelling using computational fluid dynamics (CFD)


Phast CFD extension

Complex geometries for modelling circular and rectangular pool fires and jet fires


Explosions extension

Interaction between a flammable cloud and regions of congestion


Multi Component extension

Rigorous calculation of mixture thermodynamic properties

What can Phast software do for your company?

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