Modeling Software for EHS Professionals

Fire Models

Model a wide range of conditions with four fire (thermal radiation) models. These include the Gas Research Institute (GRI) unconfined liquid pool, confined liquid pool, and jet fire models, as well as the U.S. EPA BLEVE (Boiling Liquid Expanding Vapor Explosion) thermal radiation model. All four models can calculate the thermal radiation level produced by the fire, including the radius within which a specified radiation level will be exceeded. Additionally, the BLEVE model provides the total amount of thermal radiation exposure over a given time, and the confined pool model will calculate the temperature rise of various types of substances that are exposed to the fire.

Confined Pool Fire

Liquid or dense gas fires that are confined, such as in a burning storage tank or by a dike, can be modeled with the GRI pool fire model. In addition to instantaneous thermal radiation exposure, the confined pool fire model calculates the temperature increase expected due to the fire at user-defined points. Users can specify the material and thickness (e.g. a 10 cm thick steel plate) in order to generate a precise temperature rise estimate.

Unconfined Pool Fire

For cases in which a burning pool of liquid or dense gas is free to spread (not blocked by walls or dikes), the GRI unconfined pool fire model can be used. Pool spreading is modeled, taking into account factors such as wind speed that can affect the spreading rate. Thermal radiation exposure is calculated over time, frequently increasing with time as spreading produces a fire with greater surface area exposed to air.

Jet Fire

The GRI jet fire model allows a wide range of fire sources to be modeled, including flares, pipeline leaks/ruptures, and well blowouts. In addition to gas composition and release rate, the model takes into account factors such as the tilting of the flame due to wind speed and height above ground level.


The BLEVE thermal radiation model simulates a fire that may result from the leak or rupture of a pipeline containing a compressed or liquefied gas under pressure, and provides the total amount of thermal radiation exposure over a given time.