Setting the input data

The node will be shown as incomplete when you insert it. Most of the fields take default values from the Pressure Vessel, but the frequency for the rupture event must be set directly at the Scenario level.

For this tutorial, you will edit the Scenario, complete the input data, and set non-default values for two fields.

Elevation in Scenario tab section

The default value for the release Elevation is 1 m, but for the rupture you should set this to 7.37 m, which is the elevation of the centre of the sphere above the ground. You could have set the value of 7.37 m in the input data for the Pressure Vessel, but the other Scenarios will have different values for the Elevation, and to reduce the risk of confusion, the Pressure Vessel has been left with the default value of 1 m, and the Elevation is being set individually for each Scenario.

Event frequency in Risk tab section

Move to the Risk tab and enter a value of 1E-5 /AvgeYear in the Event frequency field. You can use scientific notion when entering values. The other fields in the tab section are all disabled for this Scenario because they are not applicable to a material that has only toxic properties and no flammable properties.

Finally, click on OK to close the dialog.

Run the calculations for the Scenario and view the results

Select the Scenario in the Study Tree and select Run from the Home tab of the Ribbon Bar. This will run the consequence calculations for the Scenario, for each of the three Weathers in the Day Weather folder. The calculations run the Weathers for day because the Day Run Row is currently selected as the active Run Row.

Viewing the set of Graphs

When the calculations are complete, view the graphs for all of the Weathers. To do this, select the Scenario, then click on the Graphs option in the Home tab of the Ribbon Bar, and select all three Weathers in the Results Selection dialog.

You will see that there is a Pool Vaporisation tab in the Graphs View, which shows that the liquid in the release rained out; if you want more information about the behaviour of the liquid droplets in the cloud, you should view either the Commentary Report or the Dispersion Report.

The concentration graphs only ever show the outdoor concentration, but if you

move to the Toxic tab section you will see that the Probit, Lethality and Dose graphs display separate results for indoor and outdoor effects, and that there are separate Footprint graphs for outdoor and indoor effects.