Regulatory bodies (including the EPA, HSE, and COMAH) are increasingly requiring conformance with DNV-RP-F107 and ISO 23251, which rely on the updated UDM algorithms. If you are using an unmodified tutorial from five years ago, your safety study is likely non-compliant.
This updated DNV PHAST tutorial has given you the modern workflow:
Next Steps:
Remember: PHAST is a tool, but the physics evolves. Keep your tutorial knowledge as updated as the software itself.
This article was reviewed for technical accuracy against DNV PHAST version 10.3. Always verify local regulations before finalizing a safety study.
The latest version of DNV Phast, version 9.0, introduces significant updates focusing on Computational Fluid Dynamics (CFD) integration and enhanced data analysis tools. Released in late 2023, this update expands the software's capabilities beyond traditional empirical models to include sophisticated 3D scenario modeling.
The following tutorials demonstrate how to use the latest features in Phast 9.0: How to create a CFD dispersion source scenario in Phast 9.0 2 years ago How to use the Points of Interest in Phast 9.0 2 years ago How to run multiple CFD scenarios in Phast 9.0 2 years ago
DNV Phast is the industry standard for modeling discharge, dispersion, fire, and explosion hazards, with recent updates enhancing thermodynamic models for CO2 and hydrogen and refining explosion calculations for congested areas. Key steps include setting up the study tree with specific environmental parameters, defining discharge scenarios (e.g., vessel leaks, catastrophic rupture), running the Unified Dispersion Model (UDM) to calculate toxic and flammable impacts, and visualizing consequences via GIS integration. For more details, visit DNV's official training portal. dnv phast tutorial updated
After the discharge calculation, go to the Dispersion tab.
Problem: A 6-inch propane line at 15 barg ruptures 10m from a control room. Wind is 4 m/s, class D stability. Calculate:
Answer check in PHAST:
This tutorial aligns with the latest PHAST modeling standards as of 2025, incorporating 3D terrain, congestion effects, and modern validation metrics. Always cross-check LFL distances with hand calculations using the Yellow Book (TNO) correlations.
DNV Phast is a leading software for consequence analysis, used to model hazardous events like toxic releases, fires, and explosions. This updated guide covers the essential steps for using recent versions (8.4–8.9) to conduct a safety study. 1. Set Up Your Analysis
Start by creating a structured workspace to house your data.
Create a Study Folder: Go to File > New to start a fresh project. Save it immediately in a dedicated directory. Regulatory bodies (including the EPA, HSE, and COMAH)
Define Global Parameters: Your new folder will automatically include default datasets for weather patterns and global parameters. You can customize these to match your specific site’s environmental conditions.
Map and GIS: Use the Map Tab to define the geographical area of your study. Recent versions include a "Settings" tab in the Ribbon Bar for easier access to GIS and calculation tools. 2. Define Hazardous Events
Phast uses an equipment-based structure, allowing you to organize your study logically. CO2 Buried Pipeline Modelling in Phast and Safeti 8.71
DNV Phast is a industry-standard software for consequence analysis, used to model hazardous releases, fires, and explosions. This tutorial draft covers the core workflow for the latest versions (8.x and 9.0) based on recent updates from DNV’s video tutorials 1. Project Setup & Configuration Global Parameters
: Start by defining the environmental conditions. Set wind speeds, atmospheric stability (Pasquill classes), and ambient temperature, as these drastically affect dispersion results. Material Selection
: Use the material property database to select your hazardous substance (e.g., Ethane, Hydrogen, or CO2). For modern versions like Phast 8.71, specific material models for CO2 buried pipelines are available. GIS and CAD Import : Enhance your visualization by importing CAD geometries
or using the GIS interface to place release points on a real-world map. 2. Defining Scenario Types Select the scenario that best fits your hazard: Next Steps:
Introduction to pool fires scenario type in Phast and Safeti
In this basic modeling tutorial, you will learn about the pool fires scenario type and how to set up the input data. Introduction to jet fires scenario type in Phast and Safeti
DNV PHAST Tutorial: A Comprehensive Guide to Process Hazard Analysis
Introduction
DNV PHAST (Process Hazard Analysis Software Tool) is a widely used software for process hazard analysis in the oil and gas, chemical, and petrochemical industries. This tutorial provides an updated guide on how to use DNV PHAST for conducting process hazard analysis, identifying potential hazards, and implementing mitigation measures.
What is DNV PHAST?
DNV PHAST is a software tool used for process hazard analysis, which is a critical step in identifying potential hazards associated with industrial processes. The software helps to identify, evaluate, and mitigate hazards related to process operations, including toxic and flammable releases, fires, and explosions.
Key Features of DNV PHAST
Step-by-Step DNV PHAST Tutorial