Houses the meteorological conditions applied to the models.
Let’s model a common scenario:
Simulates a hole developing in a pipe or vessel wall. You must input the exact hole diameter, release orientation (horizontal, vertical, or down), and the height of the leak relative to the ground.
Consequence modeling is a cornerstone of process safety management (PSM) and quantitative risk assessment (QRA). DNV Phast is the industry-standard software tool used to model the real-world consequences of hazardous material releases. It simulates accidental releases of toxic, flammable, or explosive materials to determine potential impact zones.
Do not search for "File > New" anymore. Think: New Study > Add Scenario. dnv phast tutorial updated
| Old Tutorial Mistake | Updated Correct Approach | | :--- | :--- | | Using "Constant rate" for a pressurized liquid | Use model (PHAST 8.x has a better homogeneous equilibrium model). | | Ignoring atmospheric stability (defaulting to D) | Always run a sensitivity case with F stability / 2 m/s wind for worst-case toxic. | | Modeling heavy gas with Gaussian plume | Use UDM only. The "Gaussian" option is deprecated for dense clouds (propane, chlorine). | | Setting "Surface roughness" to 0.01 m (smooth) | Industrial sites should use 0.3 to 1.0 m – this drastically changes downwash effects. | | Forgetting obstruction modeling | In updated PHAST, go to Scenario > Inputs > Obstructions . Add a simple cubic building to see real wake effects. |
Select the appropriate model based on the failure mode (e.g., full bore rupture vs. a 10mm orifice leak).
For in-depth, hands-on experience, DNV offers official training courses. The is available for new and experienced users looking to master these skills. Upcoming 2026 Training Dates: June 22 - 24, 2026 September 01 - 03, 2026 (Busan, Korea) September 21 - 23, 2026 (Houston, TX) If you'd like, I can:
Modern iterations of Phast feature several critical enhancements designed to improve modeling precision: Houses the meteorological conditions applied to the models
View the toxic footprint using local regulatory thresholds (such as ERPG, AEGL, or IDLH values). The software maps these concentration boundaries downwind to show exactly where the gas becomes hazardous to human life. 2. Flammable and Thermal Radiation Footprints
: Define the hole size, orientation (e.g., horizontal, vertical up/down), and the height of the release. 3. Reviewing Results
Forget copy-pasting screenshots. The updated PHAST includes a :
Consequence modeling evaluates the real-world impacts of loss-of-containment events. Phast uses rigorous thermodynamic and fluid dynamic equations to track a chemical from its initial storage state through release, pool formation, evaporation, and atmospheric dispersion. Consequence modeling is a cornerstone of process safety
When reviewing results, look for three critical criteria depending on your study's objectives: Hazard Type Common Threshold Values Practical Meaning / Safety Significance ERPG-2 or AEGL-2 limits
A modernized ribbon-based interface that mirrors standard engineering software workflows. Share public link
Once the dispersion is modeled, Phast evaluates the thermal and overpressure consequences. Fire Modeling