The objective of this tutorial is to demonstrate how to use layers in the drawing. Layers are collections of objects in the drawing that allow the user to change a property of all the drawing elements in that layer at once.

In this tutorial we will use the layer to show streams on the screen while editing, but not once the drawing is printed. This is useful in a mineral processing environment where material falls, for example, from one conveyor to another.

In this tutorial you will go through the following six steps:

  1. Draw the flowsheet
  2. Set up the mass balance
  3. Add a layer to the page
  4. Add a drawing element to the layer
  5. Changing the appearance of the layer
  6. Examine the results

Step 1: Draw the flowsheet

The first step is to draw the flowsheet, as shown in Figure 1. The flowsheet consists of two conveyors in series. There is a feed stream and a product stream from the conveyors.

To draw the flowsheet use the same techniques you used during the Challenge.


Figure 1. The flowsheet for Tutorial 11.

Step 2: Set up the mass balance

Add SiO2 (s) to the list of components.

This is achieved as follows:

Press the "Add Components" Button on the Process Toolbar, which is illustrated in Figure 2, to launch the Components Selection Form.


Figure 2. The Add Components Button on the Process Toolbar.

The Components Selection Form is shown inFigure 3.

To select a component, find it in the list and then double-click on it. This will add the component to the selected components list. Should you wish to remove an accidently selected component simply double-click on the component in the selected component list.

After selecting all the required components, press the OK button to send the components to Stream manager.


Figure 3. The Component Selection Form.

Once you have entered the components, select the feed stream in the Page Viewer and in the Stream manager set the flow rate to:

  • SiO2 (s) = 1 t/hr

Now run the project.

Once the project has run, the Convergence form will be displayed. Accept the results of the run.

Step 3: Add a layer to the page

Click on a blank area of the page so that the properties of the page are displayed.

Navigate to the “Layers” property under the property viewer and then select the ellipsis button (…) to launch the “Layer Collection Editor”. Press the “Add” button on the left hand side. This will add a layer named Layer1.

The Layer Collection Editor is shown in Figure 4.


Figure 4. The Layer Collection Editor.

The properties of Layer1 are displayed on the right hand side. Navigate to the top of these properties and select the “RenderVisibility” property.

Change the Printer property from True to False.

This means that the drawing elements that are part of this layer will not be printed, but because the RenderVisibility property for the Screen is set to True, the Process Stream will still be visible on the screen.

Step 4: Add a drawing element to the layer

Select the Process Stream that is between the two conveyors.

Navigate to the “Layers” property of the Process Stream and click on the ellipsis button to launch the Layer Collection Editor.

Press the “Add” button, and then select Layer1 from the choice of layers to be added.

Step 5: Examine results

Navigate to Print Preview (File>Print Preview from the main menu), and select it.

The view that you should see is that shown in Figure 5. One can see that the Process Stream between the two conveyors is not shown.


Figure 5. Print preview without stream 200.