Viewing the Reports for the Catastrophic rupture Scenario

The program also presents results in the form of reports. If you wish you can view a report that covers multiple Scenarios – e.g. a report for all Tank farm Scenarios – but if you want to compare the reportresults for different Scenarios it is easier to view separate reports for each Scenario and compare between two reports.

To view the reports for the Catastrophic rupture Scenario for LPG sphere 101, select the Scenario and then click on Reports in the Home tab of the Ribbon Bar (or click [Ctrl]+R).

The Results Selection dialog will open, with the Catastrophic rupture

Scenario already selected as shown, and with both the Finish and the Next buttons enabled. The Next button will take you to screens that allow you to deselect Weathers and types of Report. If you click on Finish in the first screen of the dialog, the Reports View will cover all Weathers and all types of available Reports.

When you click on Finish, there will be a pause of a few seconds, the Reports View will open in the Document View area as shown.

Note: You can have many Graphs Views, GIS Results View and Reports Views open at the same time, but it is best to close a View once you have finished working with it as this will reduce the risk of the program running out of memory and crashing.

As with the Graphs View, the Reports are organised in different groups. For a Scenario under a Pressure Vessel, there are three groups: Summary, Input, and Pressure and Atmospheric Vessel. The

Summary and Input groups each contain a single Report and are present for all types of Scenario, but the Pressure and Atmospheric Vessel group contains many Reports, and is only present for Scenarios under Pressure Vessels and Atmospheric Storage Tanks. A given Report will present the results for all of the weather conditions that have been processed for the Scenario and selected for reporting.

The different Reports for this Scenario are described briefly below:

Summary group: Consequence Summary Report

This report summarises the maximum downwind distance to different types of effects, and gives a direct comparison between the different weather conditions. For example, if you click on Dispersion Results in the navigation pane at the left of the Reports View, you will move to the section of the Report that compares the effect distances to different concentrations, as shown below. For this Scenario, the 1.5/D and 1.5/F Weathers give the greatest distances.

Input group: Input Report

The Input Report lists the input data for the Scenario.

Equipment group: Discharge Report

This gives details of the discharge modelling, and the condition of the release immediately after expansion to atmospheric pressure – which is the condition used for the start of the dispersion calculations.

This report and all the other results-reports give the results for each weather in turn. The Summary report is the only report which presents a direct comparison between the different weathers - it is a compact presentation of results that are given in more detail in other Reports

Equipment group: Dispersion Report

This report contains a table which describes the location and state of the cloud at a series of time-steps during the dispersion. You might refer to this report if you wanted to understand a particular aspect of the dispersion behaviour in greater depth.

Equipment group: Commentary Report

This report highlights the main events in the course of the dispersion, and allows you to see easily if and when different types of behaviour occurred, e.g. touch-down on the ground, or the rainout of liquid droplets.

Equipment group: Averaging Times Report

The centreline concentrations given in the Dispersion and Commentary reports are all calculated using a “core” averaging time that is set in the Dispersion Parameters and that has a default value of 18.75 s. The Averaging Times report gives the centreline concentrations at a series of steps during the dispersion, calculated using alternative averaging times.

For the rupture Scenario the only alternative time is the Flammable Averaging Time (whose value is set in the Flammable Parameters). In this analysis this time is also set to 18.75 s so for this Scenario the Averaging Times report gives the same concentrations as the other reports. However, if you viewed the report for one of the Scenarios in the Toxic cases folder, you would see results for the Toxic Averaging Time (whose value is set in the Toxic Parameters), and which has the default value of 600 s.

Equipment group: Dynamic Fireball Report

The Fireball report gives radiation results for a fireball resulting from immediate ignition of the released material. The report first gives a description of the fireball flame (emissive power, liftoff height, etc.), then it gives the dimensions of the elliptical effect zones for up to five different radiation levels – where the levels are set in the Fireball tab section for the Scenario – and finally gives the radiation levels at a series of points downwind from the centreline of the release.

Equipment group: Explosion Report

The Explosion Report gives results calculated using the explosion method selected in the Explosion parameters tab for the Scenario. There are four explosion methods available for consequence modelling, with the Multi-Energy: Uniform confined method set as the default method and selected for this Scenario.

The Explosion Report gives the overpressure effect distances for late explosions occurring at a range of times during the dispersion. For each ignition time, the report gives the location of the cloud-centre, the location of the centre of the explosion, the downwind distance to up to five overpressure levels, and the flammable mass in the cloud at the time of the explosion. By default the centre of the explosion is taken as the cloud front to 50% of the LFL, but you can change this setting in the Explosion Parameters. The ignition-time that gives the greatest downwind effect distance is the one presented in the Worst Case Explosion graphs.

The range of reports presented for a particular Scenario will depend on the type of Scenario and on the behaviour of a release, and there are additional reports that do not appear for this Scenario. For example, if the material is toxic then there will be a Toxic Report with a table of dose, probit and lethality results as a function of downwind distance, and if the liquid in the release rains out to form a pool, then there will be a Pool Vaporisation Report describing the spreading and evaporation of the pool and describing the series of “dispersion segments” used to represent the vapour produced from the pool, and also a Pool Fire Report giving radiation results similar to those in the Fireball Report.