Mixtures

You can define any number of Mixtures, selecting up to eighteen pure Components in any mixture. However, we recommend limiting the number of components to a maximum of 6. An LPG Mixture is defined in the example file.

Warehouse Materials

A Warehouse Material describes the composition of a particular material that can be stored in a warehouse, for use in the Warehouse Model.

The Map tab section

You use the Map tab to describe various aspects of the surroundings such as buildings, the local terrain and bunds around equipment, and to define the images and other graphical data that you want to use as the background for displaying consequence results.

Bund types

Bund type data are used in the program in the modelling of pool spreading and vaporisation. You use the Bund Types folder to define each type of bund or evaporation-surface that you want to use in the analysis, and then select the appropriate Bund type in the input data for the Equipment item or Scenario.

Terrain types

Terrain type data are used in the modelling of pool

vaporisation and dispersion. You use the Terrain types folder to define each value of surface roughness and terrain type that you want to model, and then select the appropriate Terrain type in the input data for the Equipment item or Scenario.

Building types and Buildings

Building type data are used for modelling concentration build-up for a release inside a building, and for modelling toxic effects inside buildings in the path of the cloud. They are also used for building wake modelling of chimney releases and roof/lee releases, and for the Warehouse Model.

For these calculations, you do not define the location, dimensions or ventilation for the buildings directly on the storage Scenario. Instead, you set up Building Types and Buildings under the Buildings folder in the Map tab section of the Study Tree, and you use the Building Types to define each type of building that you want to model for concentration-buildup and each type of building that you want to model for indoor toxic effects.

Each new workspace is created with a default Bund type, Terrain type and Building type defined, and you can edit these or define any number of additional types.

Raster Image Set

The example file has two raster images defined - a map (OS) image and an aerial photograph of an area called Southpoint – and you can see these images in the GIS Input View in the Document View area to the right of the Study Tree pane, as shown below.

The Equipment items are represented by dots, and you can see that there are many dots distributed over the Chemical Plant area. The Buildings are represented by dark green/brown backwards diagonal pattern on the GIS and GIS Legend. The location data for a hazardous event is defined on the Equipment item, rather than on the Study or the Scenario.

The Display Order tab of the Legend for the GIS Input View controls the order in which the different

“layers” of information are displayed in the view. The Equipment and Building layers are at the top, which means that the dots that represent the Equipment items will always be visible. In the illustration the Southpoint_OS image layer is above the Southpoint_Aerial image layer. If you swap these two image layers by dragging Southpoint_OS to the bottom, the aerial photograph image will be displayed instead of the map image. You can also right click items in the legend and choose Display On or Display Off to show and hide items respectively.