@mitcorb said:
I suggest you experiment with TIGs Tube Along Path, or Pipe Along Path. Or get Didier Bur's Lines2Tubes.
If you are needing something beyond that, you may want to look up 3DSkeng. This is a modeling pipefitter's dream, with joints, unions, etc.Of course, I may have misunderstood your issue.
Lines2Tubes works like a charm! Thanks mitcorb!