Navisworks and Revit for 3D BIM coordination

All of below contents oriented from opinions of experienced technicians in over the world.

Revit and Navisworks are built for each other, Autocad MEP 3D is a serious attempt at BIM, but is built onto a platform that wasn't intended for modeling.
Cut sheets and shop drawings remain a 2D Autocad production, which is one of the issues with incorperating BIM throught ALL trades.

Revit is more useful on the Engineering side and Navisworks is more useful at the construction manager level working with contractors developing specific installation drawings, aka shop drawings…

Revit does not do as the type of design and Navisworks is not used to create construction documents

Revit can hydraulically calculate a fire sprinkler system and generate a fabrication stocklist of that piping system and generate a cost report and handle warehouse inventory based on the stocklist, generate weld diagrams automatically for the fabricator, tag the shop drawing automatically so those fabricate pieces can be located in the shipment of piping and installed in the field. Revit allow users to do it but the system wasn't built to do this very quickly. It isn't a tool created primarily to look each item up, calculate material cost and installation cost, then add that amount to the "Cost" field for each item

The issue with Revit is that it is more for MEP engineering and design than Shop drawing production. While in the future it may indeed do those things so that everyone can use it seamlessly. Which brings me to my point that Revit is not a good tool at the construction manager level for coordination between trades and that Navisworks is much better suited as it can read files from each trade.

Construction managers try to force everyone to be "seamless" and use a program that cannot adequately do what we need it to do.  And the real reason I see them wanting it is because they want a smoother project and they see that utilizing 3D design in the coordination process is the way to go about it.  But they don't seem to see the difference between Revit and Navisworks.

Navisworks is not used to create construction documents. Rather to overlay various designs from individual contractors into one 3D model.  Naviswork is better than Revit reviewing their model and looking for interferences.

You are modeling HVAC and plumbing in Revit for a Mechanical contractor, while there are other models being created, .dwg format, for the different displines of the project. The GC is using Navisworks on the jobsite for 3d coordination and to run clash detection.

That is 3d coordination/clash detection with .dwg models and .rvt models is near impossible to do with just Revit and AutoCAD. The firms creating the .dwg models have to export to .ifc files for me to be able to manipulate them in Revit and run clash detection correctly but when importing .ifc files into Revit MEP the software kicks back 100s of errors causing the deletion and disconnect of may elements. Having Navisworks fort the overall clash detection so far seems to be the way to go.
All in all, different softwares, different file types, seems like anyway you go, you will lose information in translation which defeats the purpose of 3d models and coordination.

In many experiences, conduit in AutoCAD made them dislike conduit in Revit. However, as they continued to use Revit, they quickly learned new tricks for Revit conduit. Additionally since Revit is a model authoring program, all the other features about it make it a much better choice for general management of the project.

Revit is very useful and very much more than "just a design and engineering" software and Navisworks coordinate with Revit for 3D BIM coordination

For electrical contractors, pre-fab is different than it is for ductwork and piping. We currently don't do any pre-fab. I can understand the other comments regarding the differences between FAB software and engineering software. But for electrical, we can field bend conduit and certain types of cable tray, so we don't really need to be able to create a schedule of every fitting used in the project. For our purposes Revit is very useful and very much more than "just a design and engineering" software.


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