Unable to Access "System Type" Parameter for Pipes in Revit Using Dynamo

[gregor.gojkosek37AZU]

Hi everyone,

I’m working on a script in Dynamo to extract the “System Type” parameter from pipes in Revit. However, I’ve encountered several issues that I can’t seem to resolve.

In the attached screenshot, I’ve tried the following approaches:

Element.Parameters:

• I inspected all available parameters for the pipe elements using Element.Parameters.
• The “System Type” parameter does not appear in the list.

Element.GetParameterValueByName:

• I attempted to use Element.GetParameterValueByName with “System Type” as the parameter name, but the output is empty.

Element.ElementType:

• I explored the element type properties of the pipes, but the “System Type” parameter does not seem to be associated with the type either.

All Elements of Category:

• I used All Elements of Category to get the pipes, and I confirmed the pipes are valid elements in Revit. However, the “System Type” parameter is still inaccessible in Dynamo.

Additional Context

• The “System Type” parameter is visible in the Revit Properties panel under the Mechanical section when I select a pipe (e.g., “OG-PREDTOK”).
• It seems this parameter is tied to the MEP system the pipe belongs to, but I haven’t found a way to access it in Dynamo.

Questions

• How can I access the “System Type” parameter for pipes in Dynamo?
• Is this parameter only accessible through the Revit API via Python or C#? If so, what is the correct approach?
• Are there any workarounds to retrieve System Type directly or indirectly for MEP elements like pipes?

[BimAmbit]

@gregor.gojkosek37AZU I think “System Type” is at instance level.

[sovitek]

Hello @gregor.gojkosek37AZU and welcome to the forum…system type is a instanceparameter and you should could get and set…but not if undefined

[gregor.gojkosek37AZU]

Dear both,

Thank you for your answers.

Could you please clarify what you mean by “undefined”?
From my understanding, every single piece of pipe in the model should have a System Type defined. Could it be that just one pipe somewhere in the model is missing a System Type, and this is causing issues for the entire model?

Looking forward to your clarification.

[sovitek]

Yeah i just mean as here, then you cant set thesystem type…and if try get the parameter it will gve a string “undefined” and not a element.type

but if you have undefined just filter them out or set a type with connecct a pipe with systemtype, as we have to do manuel in revit as well…if that the case you can take a look here…Apply MEP System to a "Undefined" System Type Network - #2 by sovitek

[gregor.gojkosek37AZU]

Hello,

I’ve made sure all pipes are having System Type assigned. But after running script is still makes no usable results.

How come System Type parameter is not shown here at all?

[sovitek]

its becourse system type is an instance parameter and not type

[gregor.gojkosek37AZU]

Ok… I am making some progress. But now I am stuck with “basic” issue. I am 100% sure this is correct name (also regarding Case sensitive), I have also tried writting to some other parameters and I keep getting same error.

I tried restarting PC.

[sovitek]

great …try as here and see if it could help, and the value should be a system type element as i think you want…but cant understand that language if it a other parameter you want write to then be sure you spell it right and the parameter is a text parameter

[gregor.gojkosek37AZU]

Thank you.

Unfortunately that still makes some weird results:

Why is it also writting “Povratek” to the System Types that do not contain “POVRATEK”?

[sovitek]

arhh ok guess your parameter name should be System type and then feed in a system type in value from element classes

[gregor.gojkosek37AZU]

Here is bigger picture

[sovitek]

have you tried as here…as i still guess its system type you will set

[gregor.gojkosek37AZU]

Thank you very much for your efforts!

No, I will not be modifiying parameter System Type. Based on the System Type parameter I need to modify some other Text values that costumer is demanding.

[sovitek]

something here then ? here i write system type name to an instance parameter (comments) and be sure all these element you feed in actuelly have a system type parameter