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Thread: How to trace a piping system over an imported AutoCAD isometric

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    How to trace a piping system over an imported AutoCAD isometric

    Hi All,

    I really need some help with the following as I am struggling to recreate a 2D piping design in Revit.

    I have drawn my piping design in an isomteric view using AutoCAD 2013 incorporating all the angles necessary.

    I have then loaded this isometric CAD file into Revit MEP and is displays properly shwoing the angles that the lines have bee drawn at.

    I now want to use this to "draw over" using the piping in Revit, but the program does not recognise any of the isometrics points as base points and I cannot seem to get any pipe to follow my isometric trace.

    Can anyone give me an idea of how to do this as this is my first time using this?

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    Nobody help?

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    I don't think you will be able to use the isometric from ACAD to trace over. The ACAD isometric is really just a "flat" x,y, drawing. In revit, you draw your piping where it actually goes. Then, hide all but the pipes, fittings, and fixtures in a 3D view. Rotate it and lock it. That's your isometric. It's an actual 3D representation. The great thing is, once you lock and save the view, you can tag all the lines and fixtures.
    Attached Thumbnails Attached Thumbnails How to trace a piping system over an imported AutoCAD isometric-sewer-iso.png   How to trace a piping system over an imported AutoCAD isometric-water-iso.png  

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    Forum Co-Founder Twiceroadsfool's Avatar
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    You can get a plumbing isometric from AutoCAD that is an actual 3D iso, as well. The trouble is, people do this for a lot of utilities and make the assumption that "Pick Lines" will "3D snap," which it wont. Pipes in Revit are in 3D, but they are created based on 2D workplanes. Meaning even if you go in to the pipe tool, and select pick lines: It WILL let you click on the lines from the CAD pipe representations, but they will end up flat on the workplane regardless. So it will only help you remodel them in the X/Y plane, then you have to slope/move them in the Z direction manually.

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    Thanks for the replies so far.

    Just to help illustrate my point a little more I have attached the Iso that I initially imported from ACAD. It was drawn in the Isometric view thus allowing the to accurately draw at the angles required for when I linked it into revit.

    Is there anyway of using this layout as shown to trace or somehow making it so that I can snap to the points of it and overlay the pipes and fittings?

    Regards
    Attached Thumbnails Attached Thumbnails How to trace a piping system over an imported AutoCAD isometric-revit-mep-2012.jpg  

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    Quote Originally Posted by dzatto View Post
    I don't think you will be able to use the isometric from ACAD to trace over. The ACAD isometric is really just a "flat" x,y, drawing. In revit, you draw your piping where it actually goes. Then, hide all but the pipes, fittings, and fixtures in a 3D view. Rotate it and lock it. That's your isometric. It's an actual 3D representation. The great thing is, once you lock and save the view, you can tag all the lines and fixtures.
    Just to clarify I have attached the Iso that I drew in ACAD showing that I did draw it at the correct angles not just "flat".

    Is there any way that I can then use this to "snap" pipe fittings to so that I don't have to specify individual points and % inclines of pipe slope?
    Attached Thumbnails Attached Thumbnails How to trace a piping system over an imported AutoCAD isometric-revit-mep-2012.jpg  

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Twiceroadsfool View Post
    ... Meaning even if you go in to the pipe tool, and select pick lines: It WILL let you click on the lines from the CAD pipe representations, ...
    Pick line option in the Pipe tool?

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    Quote Originally Posted by d.george View Post
    Just to clarify I have attached the Iso that I drew in ACAD showing that I did draw it at the correct angles not just "flat". Is there any way that I can then use this to "snap" pipe fittings to so that I don't have to specify individual points and % inclines of pipe slope?
    You can, but you don't need to. If you are going to work with Revit MEP, you don't need to start in AutoCAD and then link to Revit. This brief video shows two different examples:


    • The first sample shows a generic group of 3d lines in different directions, an AutoCAD .dwg file linked into a Revit model, used as a base to make pipes tracing over the CAD link. As you can see in the video, the Endpoint Osnap detects the endpoints of the CAD link, but when you need to go up or down, the endpoint won't be available because those points are at another elevation, but if you change the elevation, now the endpoints will be available again.
    • The second example shows a case more similar to yours, in which the pipes are drawn in an elevation view.


    So, as I said, it can be done, but why bother with the CAD link in the first place if it can be done in Revit MEP from the beginning?


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    Thanks for the reply and video.

    The reason I am asking this question is because I normally design sprinkler systems using ACAD 2013 in 2D plan and sectional views but a new client want to use BIM to ensure no clashes with other services prior to fabrication of pipe work.

    Seen as I already had the isometric and plan drawn I thought it may be easier to use this linked in Revit to allow me to design it as I have never used Revit prior to this current project.

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    Quote Originally Posted by Alfredo Medina View Post
    Pick line option in the Pipe tool?
    Yeah, my bad. I was recaling slanted columns, in RST, i think. With Model Lines brought in through the API. Clicking on them placed vertical columns, and not canted ones over the model lines. I wouldve swore the issue was with Pipes, but it obviously isnt since you dont get the standard draw mode.

    Regardless, the premise of the description i gave is still true. Pipes are a "workplaned" item, with offsets, so using a 3D iso from CAD isnt going to help be very efficient.

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