In setting the Failure frequency along the segment, you can either specify the total failure frequency for the segment, or give the frequency for a given length, e.g. per km.

For this tutorial, set the Failure frequency to 10-5 /AvgeYear, the

Failure frequency supplied option to Per supplied length and the Supplied length to 1000 m, as shown.

When you OK the dialog, you will see that the Scenario group folder and the nodes inside it are no longer greyed out. This is the effect of selecting the group for the route segment.

Running the consequence calculations and viewing the results

Select the Route Model and run the calculations.

The smallest effect distances are likely to be for the vapour leak as it will have the smallest release rate. If you view the outdoor toxic lethality graphs for this Scenario, you will see that the minimum effect distance to 10% lethality is about 50 m. The value of 50 m that you set for the Spacing of events is therefore of the same order as the smallest significant fatal effect distances, and you can leave the route segment with this value.

Saving the workspace

You have now completed the input data for the consequence analysis, and you should save the workspace.