Vent Dispersion Study
Computational atmospheric dispersion modelling to define safe zone boundaries and separation distances.
Request This ServiceWhat is a Vent Dispersion Study?
A Vent Dispersion Study uses computational modelling to predict the behaviour of gases released into the atmosphere — whether from controlled vents, relief devices, or accidental releases — and determines the distances at which flammable or toxic concentrations could pose a risk to people or equipment.
The study typically covers both flammable dispersion (to determine Lower Flammable Limit contours) and toxic dispersion (to determine concentration contours against ERPG-2, IDLH, or other toxicological limits). Results are used to set safe separation distances, vent stack heights, and hazardous area classification boundaries.
Raizon uses industry-standard dispersion modelling software including PHAST (DNV) or equivalent tools, calibrated to the meteorological conditions relevant to the facility location in Pakistan.
What We Deliver
- Dispersion contour plots for flammable and toxic scenarios
- Hazardous area classification support documentation
- Safe separation distances for buildings, ignition sources, and boundaries
- Vent stack height recommendations based on dispersion results
- Summary report with assumptions, methodology, and findings
Who Needs This Study?
Facilities with atmospheric vents, pressure relief systems, or areas where toxic or flammable gas releases could affect personnel, neighbouring assets, or community areas.
Our Approach
Scenario Definition
Identify release scenarios, source terms (mass flow rate, temperature, pressure), and representative atmospheric conditions for the site.
Modelling
Run dispersion calculations using PHAST or equivalent for each scenario under worst-case and representative atmospheric stability conditions.
Analysis
Determine LFL/UFL contours, toxic concentration contours, and safe separation distances from dispersion results.
Reporting
Produce report with dispersion plots, hazardous zone extents, and recommendations for vent routing, stack height, or facility layout.
Ready to start your Vent Dispersion Study?
Contact Raizon today for a free consultation. We'll discuss your requirements and provide a tailored proposal.