If you want to run different sets of Weathers for different sets of Equipment items, then you can insert additional Weather folders in the Weather tab of the Study Tree and define the sets of Weathers in these folders. If you organise the different sets of Equipment items under different Studies in the Models tab section, you can then use the input settings in the Study dialog to choose the appropriate set of Weathers to use in the calculations for each Study.

The Parameters tab section

This tab section is not present in Phast Lite.

Parameters are background inputs that are applied to all calculations and are not specific to a particular Equipment item or Scenario. Some of the parameters in the program are used to provide default values for the aspects of Equipment item and Scenario input that are usually shared between groups of Equipment or Scenarios. Other parameters deal with advanced modelling assumptions and do not appear in the Equipment or Scenario input data.

The full set of Parameters is extensive, and it has been organized into several groups. The icons for the groups in the example file have a green arrow at the top left of the icon. The program uses this arrow to show that all of the Parameters under that icon are using the default values that are supplied with the program. If you change the value of

any of the Parameters then the green border around the icon will disappear. This allows you to see at a glance which aspects of an analysis are using all-default values, and which are using changed values.

Each new workspace will be created with a Parameter set folder, with a full set of Parameter groups defined in the folder. As with the Weather data, you can edit the values in this set, and you can also define more than one set, and select different sets for use with different Studies.

The Materials tab section

The program is supplied with a set of System Materials that contains full property data for more than sixty materials. However, the Materials tab section does not show icons for all of these materials, but only for materials that have been selected in the input data for the various Equipment items in the workspace, or for materials that you have added yourself while working in the Material tab section.

You can define three types of material:

Pure Components

Most of the icons in the Materials tab for the example file are pure Components. As with a Parameters group, a Component will have a green arrow at the top left of the icon if all of the input fields for the Component have the

values that are set for that material in the System Materials. You can change the values if you wish - e.g. to enter

different probit values for a toxic material – and if you make changes the green arrow will disappear.