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7/27/2019 Phast and Safeti QRA - Screenshots
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Phast and Safeti - Quantitative Risk Assessment
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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 fromatmospheric 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.
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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.Consequence results include:
Discharge details
Dispersion results including full description of a dispersing cloud over time, providedthrough 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 weatherconditions
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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
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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 Contours visually describe the level of r isk 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
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