Phast and Safeti - Quantitative Risk Assessment
Phast and Safeti offer a simple and flexible process for analysing process industry hazards. Simulation of accidents from hazardous events can be conducted in several steps.
1. An example of the simple release case inputs The vessel/pipe source can be used to efficiently describe releases scenarios such as ruptures, leaks, short pipe ruptures, long pipeline releases, relief valves & bursting discs, vent from atmospheric storage tanks, fixed duration releases and tank roof collapse. These releases can also be performed using an indoor model to investigate the effects of secondary containment and subsequent release to atmosphere.
Fig - the Material tab of the Vessel/Pipe source model, where stored material, inventory and process conditions are specified
2. An example of one of the many effect results When performing consequence analysis you then would work with the array of consequence results to make decisions about your process plant design, operation, layout, and emergency response. C onsequence results include: Discharge details Dispersion results including full description of a dispersing cloud over time, provided through reports, and graphs of sideview, footprint and cross sections Pool formation and re-evaporation details Flammable: fireball, jet fire, pool fire radiation intensity, close and lethality Flash fire envelope graph Toxic dose, probit and lethality reports and graphs Explosion output, using TNT, TNO, Baker Strehlow Tang methods Phast and Safeti can simulate an array of release and effects under various weather conditions
Fig - An example of Jet Fire radiation versus distance results
Fig - An example of the Jet Fire radiation and effect zone over a satellite photo
3. Addition of further information used in Risk calculations If you are interested in risk analysis you would continue to work with further information to describe your activities including onsite and 3rd party population, ignition sources and wind direction and condition probabilities.
Fig - An example of population and ignition sources located on a GIS map Safeti then performs calculations to determine the impact of your flammable and/or toxic clouds and
how they interact with the ignition sources and populations you have specified.
4. An example of Individual Risk Contours The results are provided in a variety of useful forms such as Location Specific Individual Risk contours. Risk C ontours visually describe the level of risk on your map, so you can determine whether the risk is tolerable in sensitive areas.
Fig - An example of Individual Risk Contours
5. An example of Societal Risk Curves The risks can also be displayed as societal risk curves, commonly referred to as FN curves; which show the likelihood of fatality to various sizes of population who are exposed to the effects of your process plant activities.
Fig - An example of Societal Risk, FN Curve with Risk Criteria lines displayed Safeti then contains an array of tools for ranking the risk by the contributing release case, effect type, even weather direction. When analysing societal impact Safeti can also tell you which populations have been impacted by the various releases, providing PLL (potential loss of life) and FAR (fatal accident rate) measures.
CONTACT US FOR MORE INFORMATION
CONTACT US R e que st for Q uote R e que st for inform ation
CUSTOMER AREA C ustom e r login Phast and Safe ti training sche dule Eve nts
DNV SOFTWARE OFFICES C ontact your local office
