I can´t see correctly the pipes created in cadworx into Microstation like attach files
Please also advise on the Version of MicroStation and Object Enablers used if any, it may be related Defect 855521 resolved in Update 9 see also the Help where with reference to the MS_DWG_OEBREP_AS_BREP variable to see if this has any bearing.
See also this thread
Regards
Carl Myhill
Technical Support Engineer
Bentley Systems