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Enviado porAnonymousel10-25-201603:18 AM
Estado:
Archived
Duct fittings area
The title is already the description. Is it possible to have the area of duct fittings available in the families already provided with Revit installation?
We are a consulting company and never go far to the Fabrication. Nevertheless we need to know the Duct Fitting area for project estimation.
I believe Revit can calculate a Fitting area: calculate area of the 3D element body and subtract summary of Duct Connectors area. I think it gives exactly what we need.
If Revit were to simply compute the area of the fitting solid surfaces, for example, a round tee, there may be some surfaces on the solids that aren't part of the fitting, besides just the connectors. For example, where the branch 'solid' intersects the main 'solid', there is a hole in the main, and the connected end of the branch isn't actually there, and there is some 'trimming' of the branch cylinder to get it to conform to the main.
Can you elaborate a bit on what details go into a project estimate? E.g., is it just the area of the fitting? do you account for other factors, such as material (e.g., heavy gauge vs light gauge sheet metal), etc?
Currently we consider the following duct materials: regular (galvanized), aluminum, PVC coated, black steel, and stainless steel. We don't differentiate light and heavy gauges for the moment, but it can change later.
Unfortunately we can't make all the materials with "true Revit" functionality like defining a duct type for every material. It not only multiplies a number of duct types, but also requires to duplicate and assign duct fitting families for every material. I found it is not realistic for now. Duct and duct fitting materials are driven by the "Duct Material" text parameter (actually we are using predefined combinations of the duct material and allowed external and internal lining). Ducts in plan view are hatched according the material. Also we create a duct material take-off report with Revit schedule.
I believe, in your example the branch and the main 'solids' should not be a problem because the Family should be properly designed which means it should be one single solid created with the "Join Geometry" command. It would have true 3D geometry resulting proper surface area calculation. I don't see a problem here, but there is a problem with a tap takeoff fittings from round and oval ducts. Revit doesn't cut the main duct 'solid' from the tap. If one day Revit could do that then it would be no obstacle for true fitting area calculations.
We as consulting family don't care much about the duct area calculation precision. I think the proposed mathematics works well for vast majority of the fittings. Even with the described imperfectness the fitting area calculation would be absolutely acceptable for us. An approximate result is much better than nothing.
Thanks for taking the time to submit your idea. Unfortunately, this idea did not get the support of the community over the last 6 months and as such we will not be pursuing it at this time. Please feel free to rework (titles and clear descriptions are really important) and resubmit this one down the road.