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
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
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To Draw or not to Draw ...... Thats nolonger a question .. We draw
