To Lock Pipe Elevation During Drawing

1. Add pipe, as explained in Creating a Piping System.
2. On the Properties palette, under Placement, specify an elevation and begin the pipe run.
3. Lock the elevation property to prevent a pipe segment along a run to snap to a segment at a different elevation.
   Tip: By default, the lock is turned off whenever you start the PIPEADD command. The setting also resets to Unlocked when the command ends. See Pipe Elevation Lock for more information.
   Tip: To connect a horizontal pipe to a vertical pipe, move the cursor over the vertical segment to get a pipe curve connector, and click on it. If necessary, try using a different view, such as a side or isometric view, to achieve the desired connection.