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Thread: Changing Pipe from One System to Another

  1. #1
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    Changing Pipe from One System to Another

    Situation:
    95% complete piping systems. Some of the branches need to be changed from supply to returns and vice versa. Even after removing fittings and pipe segments to make a separation, when I change the branch supply distribution from supply to return, the entire system changes.

    Question:
    Is there a way to separate the branches from the main system?

  2. #2
    Forum Addict josephpeel's Avatar
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    If you change the system type of an unconnected pipe it should only change the system of connected things.

    The exception is if there is some kind of terminal (Grille, tap, radiator or whatever) attached that already belongs to the main system.
    If this is the case the way to fix it would be to select the main pipe system, edit system, remove elements, remove the terminal units attached to the branches from the main system. Then try changing the branch again.

    Alternative is tab until you get only the dashes line of the system, not the pipes, and delete. All the pipes will become 'undefined' and you cant change the system but if you do 'draw pipe' on an open end and draw a tiny bit of new pipe the system will be restored for all the connected pipes and you can set it to what you want without affecting any other unconnected pipes.

    Personally my opinion is you should NOT connect all the branches in a system to the main distribution. For 2 reasons;
    The bigger a connected system gets the longer it takes to recalculate everything every time you change part of it. On a recent project, 4 floors with a fully connected chilled water system, pressing tab on a pipe meant waiting 15 min....
    One big system has the kind of problems that you have now and is also hard to fix when something gets disconnected. The whole system will stop reporting flow rates etc because there is one open end somewhere.
    I model all the detailed branches on a room, zone, department or floor basis, depending on how the building is made up, to keep them small and independant. Then I total all the flows for a particular department in a schedule and put the result in an 'endcap' that has a flow rate to size the main distribution from the department to the plant room. This also means you can design your distribution in shafts and corridors etc based on rough per m2 values and then check and refine the totals as rooms get filled in with detail design. (Instead of waiting until everything has been modelled and connected before you can get a total flow rate from the pipe)

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    One would think that it should but that is not the case. I understand about the calculations but we are not using them yet and have them turned off. I ended up shifting the positions of the pipes because wasting a few hours in the process. There HAS to be a way to break out disconnected pipes from the system.

    The method you suggest does not make sense to me. I understand the concept, but if Revit is gonna come to a grinding halt when we start using it for calculations, there are going to be some very unhappy users.

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    Quote Originally Posted by RobDraw View Post
    One would think that it should but that is not the case. I understand about the calculations but we are not using them yet and have them turned off. I ended up shifting the positions of the pipes because wasting a few hours in the process. There HAS to be a way to break out disconnected pipes from the system.

    The method you suggest does not make sense to me. I understand the concept, but if Revit is gonna come to a grinding halt when we start using it for calculations, there are going to be some very unhappy users.
    How do you turn the calcs off? or on for that matter? as I am stuff im putting into revit is already pre-designed etc.. so donest really need calcs

  5. #5
    Forum Addict josephpeel's Avatar
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    under Families in the project browser, pipe/duct systems, Select system, type properties. Lots of other good stuff in there too like material per system, so you can give them nice colours in 3D or system abbreviation.

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    Quote Originally Posted by josephpeel View Post

    Alternative is tab until you get only the dashes line of the system, not the pipes, and delete. All the pipes will become 'undefined' and you cant change the system but if you do 'draw pipe' on an open end and draw a tiny bit of new pipe the system will be restored for all the connected pipes and you can set it to what you want without affecting any other unconnected pipes.
    I am completely grateful for this solution. I had a problem where my Domestic Hot Water Recirc became connected to the Domestic Hot Water (because whoever drafted it didn't place a fitting between the systems to separate them) and all the pipe became one system. Disconnecting the pipe at the problem locations did not remove the connectivity between the pipe systems. However the solution above allowed me to control the pipe separately.

    I think it has to do with the assigned System Name to the pipe (both sets of pipe for me were DHW 3). but I couldn't figure out how to change the system name for a section of pipe, rather than the whole connected run.

    Thanks Joseph, saved me a few hours!

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    I forgot about this thread but the project is still all too fresh in my head. I had inherited that project from some people that were supposed to be good at Revit. I wasted so much time trying to fix what they had done based on that supposed knowledge since I'm such a noob, only to redraw almost the entire system. There were several changes to it since the OP and at every riser location, of which there were originally like 92, there were systems that were cross connected amongst several other really bad modelling techniques, to use the term loosely.

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    I too have run into this issue and have not found the solution. I have always had to re draw the pipe. Grateful if anyone has found a solution!

  9. #9
    Forum Addict tzframpton's Avatar
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    Quote Originally Posted by Joelle View Post
    I too have run into this issue and have not found the solution. I have always had to re draw the pipe. Grateful if anyone has found a solution!
    The solution is to separate the pipe (usually best at a fitting), Tab+Select the system that needs to be changed and Delete. This creates an undefined system. Delete any vestige pipe coming off the current system you will connect back into. Create a new system for the Undefined pipe network, then Pick+Drag the pipe connector back to the fitting. It will keep separate systems.

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