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Thread: how to change the flow rate (mep fitting) of Fixture Units with excel within Revit

  1. #1
    Junior Member nono007's Avatar
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    how to change the flow rate (mep fitting) of Fixture Units with excel within Revit

    Hi guys,
    I would like to use Dynamo to size pipes and pipe fittings Pipe size=(Flow rate) or Pipe size=(Fixture Units) with excel or not , within Revit.

    Because in my country the formula for calculating flow rate of plumbing systems is with the formula of Flamant ( un real flow rate and a concept flow rate, it is not exactly the same.)

    Does anyone have a track or an example flow rate link with excel file ?

    Thanks in advance.
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  2. #2
    New Member timmywitt's Avatar
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    We use an add-in called Ideate BIMLink to mass edit parameters with Excel. I can successfully use it to export each pipe with its associated Fixture Unit and Flow parameters, but they won't import back in, since they are "read-only Revit properties."

    You may be able to program the functionality in with Dynamo, though. Something like an if/then statement where if(and(fixture units>3, fixture units<6), pipe size = 3", Else...)...

  3. #3
    Forum Addict josephpeel's Avatar
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    You cant insert new flow rates into Pipes.. because they get them automatically from whatever they are connected to.
    You could definitely import flow rates to the connected air terminals, plumbing fixtures etc though and then size your system from that.

    If you want to use a totally different formula for the flow or fixture unit calcs, you should take a look at this;
    The Building Coder: User MEP Calculation Sample

    It takes some C# programming, but I am crap programmer and managed to modify the example and get it working.
    (But please dont ask me how.. it was a while ago and I dont plan on doing that again).
    So get any competent programmer to have a look at it and they should be able to figure it out and set it up with the formulas you need.

    It works like a Add-In which is loaded when you start revit, but lets you select a different flow calculation in the Mechanical Settings options.

  4. #4
    Junior Member nono007's Avatar
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    thanks for your advices ! I will search for a programmer C !Joseph, have you the source code MEP calculation ?
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