Carrying out an isolation trace

The isolation trace is used to determine the nearest valves to be closed in order to isolate one or more selected pipes. The trace works outwards from selected links until the tracing tool reaches pre-defined boundary points.

To carry out an isolation trace:

1. Open a network.

   The network does not have to be checked out.

2. Optionally, open a control set.

   Tip: The trace will be enhanced if control data is associated with the network.

3. Optionally, select the objects on the network that you want included in the trace.

   If you do not select the objects at this stage, you can specify which ones to use later.

4. Select Tools | Isolation trace….

   This displays the Isolation Trace dialog.

5. Complete the sections of the Isolation Trace dialog as required:
   • Define boundary points at which it can be assumed that a link can be closed.
   • Add a selection of links that are to be assumed as available to be closed for isolation purposes.
   • Add a selection of objects that are to be isolated on the network. The isolation trace will start from the links in this selection.
   • Check the transfer node status.
   • Optionally, select marker options.

   For details of the above, see the Isolation Trace dialog topic.

6. If you are going to use the non-interactive mode, select the Non interactive mode check box.
7. In interactive mode:
   • Use the (Step forward) button to start the trace.
   • Indicate which node (if any) the selected link is to be closed at.
   • Indicate any actions required when prompted as the trace progresses.
8. In non-interactive mode:
   • Specify which valve types are to be used as boundary valves (by selecting the Valves button).
   • On the Isolation Trace dialog, use the (Step forward) button to start the trace.
9. Optionally, define the layout of the HTML report by setting report options (by selecting the Report button).