A pipe drawing with catia is performed as follows.
First a wavy drawing is made with the spline.
Then the exit is passed to the workbench environment.
The spline is assigned to the spline.
With this plane, sketch environment is entered,
Then a circle is drawn.
Here, solid modeling is performed with the rib command.
The shell is hollowed out with the command.
The material is finally assigned and the process is completed.