Nader,
There is currently no "Pipe by Size" feature available in Revit MEP. You can go ahead and log a request in the Wish forum stating the reasons why this would be useful for you. I realize the usage myself, but it is very valuable to have customer's reasoning for features on record.
Cheers,
Kyle B
![](https://damassets.autodesk.net/content/dam/autodesk/logos/autodesk-logo-primary-rgb-black-small_forum.png)
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.