Piping System Classification issues

[Jason_Peckovitch]

Good day. I have a project that I am not working on but was asked to help. A user reached out saying that when they changed one of the piping systems from Heating Water Return to Heating Water Supply, all the Return piping turns to Supply. None of the piping was connected to any equipment (user was told not too). I went in there today and connected the piping to some base mounted pumps to start the system, all looked great until I synchronized. After that, everything was messed up again. I have followed every segment of pipe and I do not see anywhere where the two different systems are connected. The System Browser does not show any equipment. I have disconnected sections of pipe, change the system classification and it all changes again. I am at my wits end and not sure where else to look. The purple pipe is return and orange pipe is supply (please don't ask about the colors). Doesn't matter what I do, everything changes even after breaking connections. Lastly, I tried the Change Type and Reapply Type and some of the segments only show Return options. Please help.

 

 

 

[iainsavage · Accepted solution]

Jason, I feel your pain and had a very similar, very frustrating and very time consuming problem on a large hot water system early in my Revit career. Following that I never make any connections between domestic hot water flow and domestic hot water return systems.

If a connection was made accidentally and then disconnected sometimes the systematic connection is retained even although the pipes are physically not connected.

If you've now got the piping networks separated possible solutions are:-

1.  delete the systems (the systems, not the pipework!) in which case the pipework will become undefined. Then add a pipe (tee-off) of the correct classification to one of the undefined pipes - all of the connected pipes should adopt the classification of the new pipe. Then you can delete that temporary pipe and omit the tee by clicking on the minus sign at the branch or

2.  select the piping system and use the Divide System tool to create two (or more) physical networks, then change one of them.  

If this doesn't work then please upload your model for investigation.

[Jason_Peckovitch]

Iain,

I have been doing this for over 16 years and I'm not even sure what you mean by delete the system. How would I do that if there's no equipment connected? I have not tried the divide the system tool yet. I might try that this morning. Thanks.

[Jason_Peckovitch]

Iain,

After Dividing the systems, I was able to change them much easier without it changing everywhere else. Now the user can go through and find and fix the 9 additional systems that created. Thanks for the input.

[iainsavage]

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@Jason_Peckovitch  schrieb:

I'm not even sure what you mean by delete the system. 

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Tab-select several times (usually 3 to 5 tabs depending on complexity) and you will see the system highlighted (denoted by dashed lines)

Then left-click to select it.

Then delete it. System is deleted but the pipe network is retained but becomes undefined

Then create a new pipe from part of the connected network

System properties of the new pipe are applied to the connected network

Then delete the temporary pipe and tee