- Accidental Chemical Release Modeling Suite

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BREEZE Incident Analyst is a comprehensive tool for accidental chemical release hazard and consequence modeling. Featuring industry-standard toxic dispersion, fire, and explosion models that have been developed by U.S. government, military, and industry groups, Incident Analyst provides a robust capability to evaluate the threats posed by accidental hazardous chemical releases. Whether modeling for facility design/safety improvement purposes, a U.S. EPA Risk Management Program Offsite Consequence Analysis, real-time assessment of hazards in emergency situations, or reconstruction of a past incident, BREEZE Incident Analyst puts a suite of ten powerful models at your disposal, all wrapped in a user-friendly interface.

  • Incorporates established, proven models developed by the U.S. EPA, U.S. military and Coast Guard, and industry groups
  • Shorten model setup and execution time with intuitive ribbon bar interface and scenario templates
  • Includes BREEZE 3D Analyst for visualization of results, export to Google Earth, etc.
  • Model dense gas plumes and evaporating chemical pools with DEGADIS and SLAB
  • Model neutrally-buoyant gas plumes, including moving sources, with AFTOX and INPUFF
  • Predict thermal radiation exposure and temperature rise with the unconfined pool fire, confined pool fire, vertical jet fire (flare), and BLEVE models
  • Model vapor cloud explosions with Baker-Strehlow-Tang, TNO Multi-Energy, U.S. Army TNT Equivalency, and U.K. HSE TNT Equivalency models

BREEZE Incident Analyst provides safety professionals with a full suite of industry-proven toxic dispersion, fire, and explosion models and powerful tools for assessing threats to life and property due to accidental chemical releases.

Read the BREEZE Incident Analyst 2.0 Release Notes

Read the BREEZE Incident Analyst 1.4 Release Notes

Read the BREEZE Incident Analyst 1.3 Release Notes

For the full list of features and bug fixes, read the release notes above.

What's New in Version 2.0

  • Updated numerous Source Term Wizard calculations to use more modern and powerful methods
  • Enhanced the Chemical Database by adding new chemical properties in the Pool Evaporation Tab
  • Added a new Chart Tab that allows users to view the time series Source Term Wizard results and dispersion concentration results in a table or chart format
  • Enhanced the SLAB model to allow the user to specify the time step used for calculating and displaying at discrete receptors
  • Updated the Richardson Number calculation method to incorporate more commonly used equations

Program Characteristics

  • Incorporates established, proven models developed by the U.S. EPA, U.S. military and Coast Guard, and industry groups
  • Utilize well-documented, widely-accepted models: understand what your model is doing rather than trusting proprietary “black box” models
  • Achieve trustworthy results for a fraction of the cost and time of CFD systems
  • Reduce or eliminate the need to hunt for chemical properties with built-in chemical database
  • Shorten model setup and execution time with intuitive ribbon bar interface and scenario templates
  • Includes BREEZE 3D Analyst for visualization of results, export to Google Earth, etc.
  • Improved Chemical Database, including the ability to edit the database without having administrator privileges
  • Added a Table Objects Tab to speed up scenario setup and editing of sources
  • Updated ComponentOne to the latest version to improve stability and pave the way for additional improvements in the future

Toxic/Flammable Gas Dispersion Models

  • Model dense gas plumes and evaporating chemical pools with DEGADIS and SLAB
  • Model neutrally-buoyant gas plumes, including moving sources, with AFTOX and INPUFF
  • Simplify computation of release characteristics (e.g. exit velocity and temperature) when they are not explicitly known with the Source Term Wizard
  • Translate results from raw concentrations to designation of safe and hazardous areas quickly with Level of Concern database (e.g. IDLH and PEL for toxic gases, LEL or LFL for flammable gases)

Fire (Thermal Radiation) and Explosion (Overpressure) Models

  • Predict thermal radiation exposure and temperature rise with the unconfined pool fire, confined pool fire, vertical jet fire (flare), and BLEVE models
  • Model vapor cloud explosions with Baker-Strehlow-Tang, TNO Multi-Energy, U.S. Army TNT Equivalency, and U.K. HSE TNT Equivalency models

The Incident Tab is the heart of the program – through this one tab the user can specify all of the critical information needed for a model run. Chemical information, meteorological data, source characteristics, and result options such as concentration averaging time and levels of concern can all be quickly entered in this intuitive section of the program.

Meteorological Data

Meteorological data is critically important for many of the models in BREEZE Incident Analyst. The program can accept meteorological observation data, or the user can manually specify weather conditions. Additionally, Incident Analyst uses a single data form to collect all meteorological data inputs each of the individual models and selects the necessary data for each model internally. This unique feature saves time and simplifies the setup process.

Incident Analyst - Met form screenshot

Chemical Data

Select mixtures or chemicals, view their properties, and make changes to properties easily. Want to see what the effects of a change in process gas composition would be? Make quick, on the fly modifications to run that test without altering the permanent chemical database. BREEZE Incident Analyst also provides a robust capability to add chemicals, create mixtures, and save tweaks to chemical parameters – for more information on this, see Chemical Database.

Incident Analyst - chemical form

Source Data

Know which model you want to use and the parameters of your accidental release scenario? Select your model in the Source form, plug in your model inputs, and you are ready to run. Not sure which model to use, or not sure how to calculate a release parameter? For dispersion cases, use our powerful Source Term Wizard to take the guesswork out of your scenario setup.

Incident Analyst - source form

Levels of Concern and Averaging Times

Incident Analyst provides a robust ability to adjust model output parameters to suit your needs. Levels of concern can be specified based on the application’s database of thresholds, such as IDLH, PEL, and LFL, or based on a user-specified value, to determine a hazard zone appropriate for your release. Averaging times can be similarly adjusted to suit the particular chemical and situation you are dealing with, from concerns about 8-hour exposure levels to the few seconds of concentrations above LFL needed to ignite a fire or explosion.

Incident Analyst_LOC Menu

BREEZE Incident Analyst offers an array of established dispersion models developed by the U.S. EPA, U.S. military, and U.S. national laboratories. From lighter-than-air to dense gases and jet releases to evaporating chemical pools, Incident Analyst has a dispersion model that can address your accidental release scenario.

Dense Gas/Two-Phase

For dense gases and evaporating liquid pools, BREEZE Incident Analyst offers the DEGADIS and SLAB models.

  • DEGADIS, developed by the U.S. EPA, Gas Research Institute, and U.S. Coast Guard, provides dense gas and aerosol dispersion modeling from source types including jets.
  • SLAB, which was developed by the U.S. Department of Energy and Lawrence Livermore National Laboratory, is equipped to handle numerous dense-gas scenarios, including evaporating pool and jet releases.


Neutrally-Buoyant Gases

For neutrally-buoyant gases, BREEZE Incident Analyst includes the AFTOX and INPUFF models.

  • AFTOX, developed by the U.S. Air Force, models dispersion of neutrally-buoyant gas and evaporating liquid pool spills.
  • INPUFF, developed by the U.S. EPA, models dispersion of neutrally-buoyant gases from stack/jet sources. INPUFF is equipped to handle moving sources, deposition and settling, variable emission rates, and more.

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.

BLEVE

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.

Calculate the blast overpressure created by vapor cloud explosions with the U.S. Army and HSE TNT Equivalency, TNO Multi-Energy, and Baker-Strehlow-Tang (B-S-T) models. Scenario parameters can be incorporated into these models including proximity to ground level (ground reflection), density of obstacles, and vapor cloud flame speed. Incident Analyst’s explosion models make the conservative assumption of not modeling shielding from any specific structures. For more advanced explosion modeling capability, including shielding and calculation of damage to structures and people, BREEZE offers the powerful BREEZE Explosion Damage & Injury Assessment Model (ExDAM).

TNT Equivalency Models

For situations in which limited characteristics of an explosive vapor cloud are known, or in which a conservative estimate of blast effects is desired, the TNT equivalency models developed by the U.S. Army and U.K. Health and Safety Executive provide an excellent modeling option.

  • U.S. Army TNT Equivalency uses a proportional relationship between the flammable mass in the cloud and an equivalent weight of TNT, and assumes the entire flammable mass is involved in the explosion and is centered at a single location.
  • U.K. HSE TNT Equivalency uses a proportional relationship between the flammable mass in the cloud and an equivalent weight of TNT.

TNO Multi-Energy Model

An additional level of refinement in explosion modeling is provided by the TNO multi-energy model. This tool allows vapor cloud explosions to be better characterized with the definition of one or more sub-clouds.

Baker-Strehlow-Tang Model

The Baker-Strehlow-Tang model provides a powerful tool for simulating vapor cloud explosions that accounts for the degree of confinement (a key factor in determining whether a flash fire or a true explosion will occur), flame speed, ground reflection, and the number of directions in which the blast can expand. Like the TNO multi-energy model, the Baker-Strehlow-Tang model also allows an explosive vapor cloud to be characterized as multiple sub-clouds.

BREEZE Incident Analyst includes a robust chemical database, containing essential information needed by its multiple models for a wide variety of common chemicals. From physical characteristics, such as boiling point and critical pressure, to exposure hazard levels, such as Immediately Dangerous to Life and Health (IDLH) concentration, Incident Analyst’s database saves hours of time searching for data.


Adding Chemicals and Chemical Mixtures

Specialty chemicals and chemical mixtures that are not contained in the Incident Analyst database can be easily added. Mixtures are particularly simple – define the mixture’s components (e.g. 50% methane, 50% propane) and the application will automatically calculate estimated properties for the mixture. Chemicals can be added to the BIA database and permanently saved for future reference. In addition, users can save and load custom chemical databases allowing them to save one database for each project, back-up their work, etc.

Incident Analyst - Chemicals database screenshot

Two of the most difficult parts of conducting air dispersion modeling for an accidental release case are calculating the proper source parameters to use and selecting the correct model to use. BREEZE Incident Analyst’s Source Term Wizard can complete both of these tasks, greatly simplifying your job. With the Source Term Wizard, the user need only supply information that is commonly known: storage conditions such as storage tank size, shape, and temperature, and what type of accident is being modeled (e.g. a rupture in the side of the tank). The Source Term Wizard then automatically calculates the release properties needed by Incident Analyst’s dispersion models and will recommend an appropriate dispersion model to use in that particular case. Whether you are modeling an accident in real-time or just trying to get your everyday work done faster, the automation and assistance provided by the Source Term Wizard is a major asset.

Incident Analyst_STW screenshot

Import base maps (image files, DXF files, and shapefiles) to speed up scenario setup and produce highly informative results graphics. Rather than hunt down coordinates of every source and point of interest for modeling results, users can simply use the Map tab’s point-and-click interface to add these objects to their modeling runs. Additionally, model results can be quickly and easily output to Google Earth.

Incident Analyst_Map Tab Screenshot

Incident Analyst provides a robust set of model outputs. A Results Summary file provides a quick look at the most critical results (e.g. radius of exposure to concentrations over a specified threshold). For those needing more information or an in-depth understanding of why the model produced a given result, the Model Results file provides detailed information. Users can have confidence in their understanding of their results thanks to the User Guide and extensive technical documentation on each model.

BREEZE 3D Analyst Integration

Incident Analyst is fully integrated with the BREEZE 3D Analyst program (included with purchase) to provide a wealth of options for visualizing results. Load Incident Analyst output in 3D Analyst and produce image results overlaid on a map, animated results, or export results to Google Earth, Surfer, ArcGIS shapefiles, or scalable vector graphics (SVG) files.

Incident Analyst_Results Tab Screenshot

Hardware
  • Intel or AMD processor, 32 or 64 bit. 500-megahertz (Mhz) or higher
  • 1 gigabyte (GB) RAM
  • 300 (MB) available disk space for the application install
  • 1024 x 768 minimum display resolution
  • Mouse or other pointing device
Software
  • Windows 10, Windows 8, Windows 7, Windows Vista, Windows Server 2003, Windows Server 2008 or Windows Server 2012
  • Microsoft .NET Framework 2.0 or later
Additional Requirements
  • None

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