You can draw straight pipes in a pipe network using the Network Layout Tools.
You can draw straight pipes when you are using the Draw Pipes And Structures insertion mode or when you are using the Pipes Only insertion mode.
After they are inserted, you can edit straight pipes using grips.
Tip
You can use transparent commands for pipe network objects when you are prompted to specify radius, length, or station offset. For more information, see Using Transparent Commands Within a Running Command.
To draw a straight pipe in a pipe network
- Click Home tab
Create Design panel Pipe Network drop-down Pipe Network Creation Tools 
At the Command prompt, enter CreateNetwork to create a new pipe network, or Pipe Networks tab Modify panel Edit Pipe Network 
At the Command prompt, enter EDITNETWORK to select an existing pipe network. - On the Network Layout Tools toolbar, click or
. - Specify the start point for the pipe.
- Specify the end point.