Piping 3D Model first you've got to produce conceptual 2D Pipe Routing. Generally, 1 pipeline is drawn on one layer. This helps in segregating pipelines. The bundle offers tools to create various layers according to line number through a dialog box. Additionally, it supplies the facility to draw on that line number (It sets the line number as a current layer). At a Profession 2D drawing, all the pipelines have been drawn at z coordinate 0. Pipe centerline elevations are marked on every horizontal pipeline. This gives an idea about design in the plan view.