Hi Sylvain,
I know it's been a while since you addressed this subject, but did you ever solve your problem?
We are at a crossroads where we need to deicde which direction to take. We have recently ( last 2 years) started using Autoplant. There are lieks and dislikes about it, but one thing I really like is it's ability to generate isometrics complete with mat'l list. Because our structural dept uses Revit, and also several other reasons: I get the impression Revit MEP is more user friendly, it produces more attracted 3d views, one of our other offices has a subtantial library, we are thinking of switching to Revit. However, if I cannot easily produce isos like I can with Autoplant, that is a major drawback.
Opinion?
Solution: teach people Autodesk Inventor rather than Revit. it is more legible than Revit for parametric design, better integration of mechanical equipment & piping via. PCf output, and ability to promote parameter driven tagging into any view.
If you're trying to do plant process projects, and need to produce iso views that export to Isogen, then you might be better off using AutoCAD Plant 3D, if you want to stay in the Autodesk camp. It's designed to do exactly what you're looking for. You can still use Revit to produce the 3D models of the structure (the structure modeling tools in Plant 3D are a bit limited), and then export the models to a CAD file for use in Plant 3D.
Let me know if you need some additional info on this - I just finished working on the CADLearning training videos for Plant 3D 2015, and covered this exact scenario.
Piping in Revit isn't design to work in this manner, since IFC exports from Revit are simply 3D model components only. You won't get the gaskets, bolt sets, etc. that Plant D provides.
Hope this helps - thanks - db
David A. Butts
Engineering Technology Manager - Gannett Fleming
Revit Certified Professional/Autodesk Certified Instructor
Revit, AutoCAD Architecture, MEP, Plant 3D, BIM Collaborate Pro Subject Matter Expert