Openroads to Navisworks

Hi guys

I need to export some models designed in Openroads to 3D Solids so I can imprt them to Navisworks.  I have been told that if I save an Openroads model as a DWG, it will export the drainage to 3D Solids, then I can NWCOUT from there.  When I "Save As" or "Export" to DWG, the pipework is exported as flat polylines.....  What am I doing wrong?

Thanks in advance