When pipe network parts are created, they are automatically assigned names and numbers. If the default naming/numbering process does not give desired results (the numbers themselves and/or the direction of numbering) you can use the Rename Networks Parts command to automatically rename and optionally renumber a series of pipes and structures. Select a linear series of connected pipes and structures, and automatically rename them to more easily manage the network. Use this command so that you do not have to individually locate and manually rename components.
To rename pipe network parts
- On the Pipe Networks contextual ribbon, click Modify panel
Rename Parts 
.You can select to rename/renumber just pipes, just structures, or both.
- In the drawing, click to select the part(s) to rename and press Enter. The Rename Pipe Network Parts dialog box is displayed (figure 5).
Figure 5: Dialog box for renaming pipes and structures