Dnv Phast Tutorial Updated |verified| Access

This tutorial moves beyond basic button-pushing to focus on engineering decisions within the software.

Step 5: Visualizing Results – The Updated Graphics Engine

In the legacy version, you would see a simple X-Y plot. Not anymore. dnv phast tutorial updated

  1. In the results tree, expand Dispersion > Contour Plots.
  2. Double-click FLAMMABLE – LFL.
  3. The 3D Graphics Viewer opens.
    • Use mouse wheel to zoom.
    • Right-click and drag to pan.
    • New feature: Click the "Mesh" toggle to see a colored heatmap of concentration.
  4. To generate the standard "downwind distance":
    • Right-click on the contour in the 3D view.
    • Select Export to CSV or Add to Report.
    • Look for Max distance to LFL: approximately 120 meters downwind, 15 meters crosswind for this methane hole.

Part 7: Linking to Risk Assessment (PHAST to Safeti)

A tutorial isn't complete without the integration step. This tutorial moves beyond basic button-pushing to focus

In the updated software suite:

  1. In PHAST, go to File > Export > Safeti Risk File (.srf).
  2. Open Safeti.
  3. Import the .srf. The updated mapping now transfers time-varying release rates and direction-specific hole sizes automatically.
  4. Generate Individual Risk Contours (IRPA). You will see that the updated models produce higher risk near ignition sources but lower far-field risk due to better dispersion physics.

2. Key Software Updates (Relevant to Tutorials)

The official DNV tutorials have been rewritten to cover the following major changes: Step 5: Visualizing Results – The Updated Graphics

| Feature | Old Method (Pre-v8) | Updated Method (v9.x Tutorials) | | :--- | :--- | :--- | | User Interface | Multiple separate windows | Single Ribbon-based interface (MS Office style) | | Atmospheric Dispersion | Simple Pasquill stability | Updated McMullen & OGP correlations | | Jet Fire Modeling | Single point calculation | Multi-segment extended jet flames | | Pool Evaporation | Constant area | Time-varying pool diameter with bund walls | | 3D Output | External viewer | Integrated OpenGL 3D Risk Viewer |