Changing Assigned Risk Grades

Each zone and sub-zone has a risk grade assigned to it. The resulting coverage calculation will depend on the FOV Multiplier and gas cloud size defined in the risk grade.


Only one risk grade can be assigned to a zone or sub-zone at a time. However, sub-zones may have a different risk grade than its parent zone.


In the loaded file there is one zone covering the three decks with five sub-zones and three null-zones in total. Six detectors have also been defined in the project. At the moment all the zones have been assigned to the Default Grade and the sub-zones have been assigned to Grade A as seen in Figure 6 below.



Tutorial 5 - Figure 06 - Imported file with a single main zone (gray) and five sub-zones (red) defined and labeled in the Project Items Tab


The coloring of zone and sub-zone regions is based on the coloring of the assigned risk grade. If the color of the risk grade changes, so will the coloring of the zone or sub-zone.


In the project change the risk grade assigned to Sub-Zone 01 - Vessels:

  1. Select the Sub-Zone 01 - Vessels in the Project Items tab to populate the properties panel at the bottom left of the Detect3D window

  2. Under the Information section, select Grade C as the Risk Grade for the sub-zone (previously Grade A) as shown in Figure 7.


    Tutorial 5 - Figure 07 - Changing risk grade assigned to Sub-Zone 01


  3. Click off the properties panel to verify the change. The Sub-Zone 01 - Vessels should now have the yellow coloring of Grade C


Repeat Steps 1-3 above to assign Grade C to Sub-Zone 02 - Small Tank and assign Grade B to Sub-Zone 03 - Valves and Pumps.


Your project should now have two sub-zones assigned to Grade A, two sub-zones for Grade B and one for Grade C as can be seen by their coloring in Figure 8 below. The risk grade for the zone can also be changed in the same way but is left as the Default Grade for this section.



Tutorial 5 - Figure 08 - Various risk grades assigned to the sub-zones of the project