2 SETTING UP YOUR OWN ANALYSIS

The form of the analysis

This chapter will guide you through the process of setting up a workspace for performing consequence calculations. The tutorial supplies all of the input values that you will need to complete the analysis.

The Equipment and Scenarios defined in the analysis

The main aim of the analysis is to show you how you can define Equipment and Scenarios to represent the most common types of hazardous event, and how to take into account the main variables. The types of hazardous event that are considered in the analysis are as follows:

•A rupture of a vessel containing a toxic material

•A pipework leak from the liquid side of a vessel containing a toxic material

•A pipework leak from the gas side of a vessel containing a toxic material

•The equivalent three releases described above, but for a vessel containing a flammable material

•The rupture of a propane tank wagon under normal operating conditions

•A fireball or BLEVE of the propane tank wagon as a result of fire impingement

•A liquid leak from the body of the propane tank wagon

If you wish, you can omit events, define different events, or change the input values in order to define conditions that are more typical of your facility. However, if you do this you will obtain results that are different to those that will be shown in this manual.

Creating a new workspace

To create a new workspace if you have the example file open, you can select either Close or New Workspace from the File tab of the Ribbon bar. The program will close the example file and open a new workspace with a name shown as “New Workspace”.

Saving the workspace

You cannot save the workspace with the name “New Workspace” and should save it with a real name immediately.

Select Save As… from the File tab of the Ribbon bar. The File Save dialog will appear and you should locate the DNVGL folder under Documents (the default location for saving workspace files), use the New Folder option to create a folder called Tutorial, and then save the new file to this folder with the name Phast Analysis and the default file format of *.psux.