topic Re: Tube and Pipe change size issues in Inventor Forum

Tube and Pipe change size issues

ragul_ravi_ext — Wed, 06 Aug 2025 11:00:32 GMT

I am working in tube and pipe I have a 3" pipe, and I need to take a single branch that is 1" pipe how to achieve this in tube and pipe create a new run and change pipe style to 1" for this single piece of pipe or select the pipe and change size to 1" pipe. so, my question is what the proper way is to do this.

I have attached pictures.

using inventor 2024

Re: Tube and Pipe change size issues

CGBenner — Wed, 06 Aug 2025 11:52:55 GMT

@ragul_ravi_ext

Welcome to the Community!

Deciding whether or not to create a new Pipe Run depends on how the branch will be fabricated, and where it is in your process flow. If the branch needs to be a part of the same pipe line based on your P&ID or process flow, I would not create a new Pipe Run, but rather a new Route within the existing Run. If the branch line is part of a different process line, then I might make a new Pipe Run starting right after the branch.... in either case, when you create the Route that comes off of that tee, you would need to select a Tube & Pipe Style that is the correct spec and size for the new Route. In my experience, keeping the 3" Style going after the tee, and manually changing the size of the pipe does not work well. If you add fittings or make any other changes to the 1" pipe, it will revert back to 3" because it is obeying the Style associated with the route.

For more tips and help getting started with Tube & Pipe, you may refer back to this old class I did at Autodesk University (WOW!!) 11 years ago:

Going With the Flow

Good luck!

Re: Tube and Pipe change size issues

ragul_ravi_ext — Wed, 06 Aug 2025 12:09:19 GMT

What do mean by saying "manually changing the size of the pipe does not work well". Can you point out exactly what kind of issues can arise while doing so?

Re: Tube and Pipe change size issues

CGBenner — Wed, 06 Aug 2025 12:17:15 GMT

@ragul_ravi_ext

Hi again. Pipe sizes should always be controlled only by the Tube & Pipe style, never manually changed with a Right click and Change Size. As I said above, what can happen if you do this is if you add fittings downstream, or make any other changes to the 1" pipe, it will revert back to 3" because it is obeying the Tube & Pipe Style associated with the route.

Just start a new Route at the branch of the Tee fitting, and set the Tube & Pipe style to one that is 1", and route from there.

Re: Tube and Pipe change size issues

CGBenner — Fri, 08 Aug 2025 15:45:52 GMT

@ragul_ravi_ext

Were you able to get this resolved?