Viewing Gas Cloud Data and Exporting to Excel

 

Gas cloud analysis data is only available for completed simulations and can only be viewed once a monitor region has been defined.

 

The results from the monitor regions show the total mass and volume of the established gas plume within a certain region. From this, you can work out how big the gas cloud is going to be in that region, and then use that data for gas mapping or explosion analysis.

 

To view this data, open the gas cloud analysis window by selecting Gas Cloud Analysis from the Project menu, or selecting the  icon on the toolbar. The window that opens will appear as Figure 27 below. If prompted, click the Update () button at the lower left of the window to update the monitor region data. The rows of the table correspond to the simulations that have been completed, and the columns are the following figures:

  • Volume LFL - 100%: meaning the volume of gas between the LFL concentration and 100% concentration.

  • Volume LFL - UFL: the volume of gas between the lower flammability limit and the upper flammability limit

  • Equivalent Stoichiometric Volume of LFL to 100%

  • Equivalent Stoichiometric Volume of LFL to UFL

  • Q9 Volume (in m3)

  • Mass (in kg) of the gas cloud between the LFL concentration and 100% concentration.

  • Mass (in kg) of the gas cloud between the lower flammability limit and the upper flammability limit

 

Tutorial 3 - Figure 27 - Gas cloud analysis data for the METHANE HP release calculated in Tutorial 2

 

 

The entire table will change depending on which monitor region is selected in the dropdown menu located in the upper right side of the gas cloud analysis window. Change the Monitor Region dropdown to the Lower Flanges Monitor Region and see that there is no data for any of the values (as shown in Figure 28 below). This can be expected as the isosurface of the 50% LFL gas cloud points in the opposite direction of the monitor region. We will see in Tutorial 5 that this region will become relevant when more dispersion analyses are run.

 

Tutorial 3 - Figure 28 - Gas cloud analysis data for the Equipment Monitor Region

 

Switch the Monitor Region dropdown to the Equipment Monitor Region, the regions values are present as it encompasses part of the release but still not as high values as the facility monitor region.

 

Tutorial 3 - Figure 29 - Gas cloud analysis data for the Equipment Monitor Region

 

Click the Export button () at the bottom right of the window, and select All Regions, then give the file a name such as "Tutorial 3 Monitor Regions" and choose a location to save it.

 

The created excel file will appear similar to that of the monitor point data document with a cover page on the first tab. Scroll through the tabs to find data of each monitor region. The exported results will have information about each simulation (hole size, flow rate, etc) and more significant digits than the Gas Cloud Analysis Window.

 

Tutorial 3 - Figure 30 - Excel data for the Facility Monitor Region

 

Continue to the next section to go over custom gas clouds.