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Note that Pipe Network (0) means there are no objects to export, even if ther are pipe networks associated with the project. You can render them in AutoCAD Civil 3D, but if you want them to render in 3ds Max Design you may have to import them seprately via dwg import. Just a thought.
Also, if contrary to the documentation, they are supported for export, I think you have to have materials assigned to the network. It's been a while since I've played with Civil View. If you get it working, please post the solution here.