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    Duct Segments

    I work for an HVAC manufacture / installation company which has recently acquired Revit MEP. As square ducting is manufactured in segments of approximately 1.5m in length with flanges or lips to connect together, the ducting is shown in this manner in their AutoCAD drawings with a "type" or "tag" number for placing and ordering. eg. Each ducting segment of 1,5m long of the dimensions 800 x 500 will have a number 501 assigned to it. On a level you would then have say 23 items of the type 501. These are also indicated on the plan for the site manager to install in the correct areas and placing.
    In Revit all the duct work is in one long piece of duct.

    Is there a way to divide the ducts in revit in this manner?

    Ciao for now.
    Last edited by GabrielBlack; November 21, 2013, 01:28 PM. Reason: incorrect units.

    #2
    You could do it by placing a duct fitting, a union. If necessary, you could customize the family to create some lips or flanges. The default union family would look like in this image, below, which might be good enough. You can place the unions at the intersection of reference planes and the center line of a long duct. Then, you can schedule all the individual segments of 1.5 m. long and tag them all as "501", customizing the duct tag to read the value from another parameter that is not the size.
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      #3
      Alfredo Medina,

      Thank you for the reply! It's the first time I've come accross the "union" family - I guess if one doesn't use it, one doesn't see it! Thank you for the info and I'll give it a try!

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        #4
        The quick way to place unions is to set the type of union you want in the duct system routing preferences and then use Modify -> Split on the ducts.

        However, placing all those unions is still going to be a tedious job. You could try making just the flange as a Duct Accessory family. Make it an Attaches To type of accessory and then array the flanges inside the family so they appear every 1.5m between the two end reference planes.
        Then you could place the family on a long duct, stretch the two end reference planes to the ends of the duct (with the grips or Align) and all the flanges in between would appear.
        "One must imagine Sisyphus happy." Albert Camus - "The innovator has for enemies all those who have done well under the old conditions, and lukewarm defenders in those who may ​do well under the new." Nicolo Machiavelli -"Things that are too complex are not useful, Things that are useful are simple." Mikhail Kalashnikov

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          #5
          If the intention is to mimic a fabrication process or at least model to support a more realistic fabrication process then I'd be inclined to add the "flange" geometry to a custom union family so placing a union creates the break between sections and provides the more realistic appearance of a flanged connection.

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            #6
            Steve_Stafford, the intention is both. Our company manufactures some ducting and installs HVAC systems. The intention is to indicate to the folks on site which number (tag) of duct goes where as well as quantity/manufacture purposes.
            Our installations can be massive and rats-nest-like so the duct segments are numbered (as per the plan) as they're manufactured and when they get to site the guys there know where the piece goes as they have the same plan with the duct segments and numbering on. There should be no errors or misunderstandings (and there usually aren't) to where a duct (or duct run with the same tag numbers) should go. The duct with the "odd" size can also be shown on plan to best suit connection and areas that may need a little play in reality.

            Not probably the most traditional use (engineering firm) for Revit but I believe it'll have its merrits in the manufacture and installation industry too. My boss is mostly convinced - I just need to push a little and show him some more of it's merrits.
            Say something interesting....

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