Draw 2 walls same length ,enter wall properties (Modify walls) and arc extent them 180 and other wall -180 . adjust wall thickness and hight if needed . next line up walls to a circle, I use cursor keys
And Export them to .OBJ format in 3D view ""make map; pipeline"" and put your creation in there.
Next Import your new pipe in furniture

[B-)]

Tip, if u need a pipe say 10 cm diameter make it in drawing 1 meter , later u can adjust his size ,same goose for length

Some Examples ..
Plummbing
Electrical_installation_material