1 AN INTRODUCTION TO SAFETI

What to Expect of this Tutorial

The aim of this tutorial is to make you familiar with the ideas and techniques involved in performing a consequence analysis with Safeti, and to give you practice in defining a range of common types of hazardous events. By the time you have finished the tutorial you should have a firm understanding of the issues involved, and be ready to start work on an analysis of your own.

This tutorial does not cover the Multi-component and 3D Explosions functions of Safeti. There is a separate tutorial document for Safeti with the 3D Explosion extension. If you have a license for the 3D Explosion extension, you should complete this tutorial first, before starting the 3D Explosion tutorial.

The tutorial is divided into three chapters. In this first chapter you will open an example analysis provided with the program, explore its main features, and run the calculations and view the results – without having to enter or change any input data. In the second chapter you will go on to create an analysis file of your own, starting with a new, blank file, and setting up some background data in the form of a map and weather data. In the third chapter you will define a range of hazardous events and perform a consequence analysis for them, and in the final chapter you will define population and ignition data and complete the risk calculations.

The tutorial should take 2-3 hours to complete. You do not have to complete it in a single sitting, and can take a break between chapters if you prefer.

Note: all of the images of the program are taken from the Safeti product, without the 3D Explosion or Multi-component extensions. Some images will include features that are not present in Safeti Lite, and will not include the additional features associated with the extensions.

Starting the program running

When you install the program, the installation process places a shortcut for the program inside a DNV GL - Software folder under Programs in your Start menu, and you can use this to start the program.

The main window

When you start the program running, the main window will open as shown below if you have a valid licence for the program present on your machine.

If you do not have a valid licence present, the program window will not open, and instead a dialog will appear as shown.

To obtain a license, click on Request a licence. A Request license dialog will appear, and you must select the products and features for which you require a license. The dialog allows you to email the request directly to DNV GL software support, or to save the request to disc so that you can choose when to send it.

Once DNV GL software support have emailed you the appropriate license file, you should save it to disc. If you then click on Import a license file in the Safeti licensing dialog, a File Open dialog will appear, and you must browse to select the license file. The program will then copy the file to the appropriate location, and the next time you start the program, it will find a valid license and will start successfully.

Opening the Safeti examples file

When you start the program, you do not have to take any specific action to start a new analysis, as the program always starts with a new, blank analysis (or workspace) already open. You can explore the features of the program using the blank workspace as all of the features will be displayed, but this tutorial uses one of the examples files installed with the program to give a quick introduction to the terminology and approach used in the program.

To open the file, choose Open Example… from the File tab on the Ribbon Bar. The Examples dialog will open, showing all of the folders and *.psux workspace files under the Examples folder that is installed with the program. Select the Safeti examples.psux file or the Safeti Lite examples.psux file, as appropriate for your type of license, and click on OK. There will be a brief pause, and then the data for the example workspace will be displayed in the program window, as described in the sections below.

Note: the Examples folder will contain files for the four main Phast and Safeti products, and for the 3D Explosions and Multicomponent extensions to the products. If you do not have a license for a particular extension, then those examples files will not be relevant to you.