Occur when a liquid release puddles on the ground. You must specify whether the bund/containment area is limited by concrete walls or if the liquid spills onto an unconfined flat surface. Vapor Cloud Explosion (VCE) Models
DNV Phast has recently been updated to , introducing major advancements in CFD modeling and consequence analysis. New Core Features
Accurate material definition ensures reliable model outcomes. Use pure components or create complex mixtures. Input precise operating temperatures and pressures. Select appropriate thermodynamic models. 3. Create the Discharge Scenario Tell Phast how the inventory escapes into the atmosphere. Small holes in piping or gaskets. Ruptures: Full-bore catastrophic failures. Disc models: Relief valve or bursting disc activations. 4. Run the Calculations The software calculates the physical effects in a sequence. Discharge: Determines mass flow rate and state. Dispersion: Tracks the cloud as it mixes with air. dnv phast tutorial updated
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
Pain threshold; injury after 30 seconds of exposure. Occur when a liquid release puddles on the ground
Once the simulations are complete, the section provides:
Before running a simulation, you must define the environment. Accuracy here is critical; "garbage in, garbage out" applies heavily to consequence modeling. Weather Providers Select appropriate thermodynamic models
Create at least two standard weather categories to capture worst-case and typical conditions:
Shows the spatial boundaries of the Lower Flammable Limit (LFL) and half the LFL (50% LFL).