Why Revit Pipe Elbows Don’t Automatically Adjust Diameter

Why Revit Pipe Elbows Do Not Automatically Change Diameter

When drawing pipes in Revit, pipe elbows are automatically inserted, and their diameters typically adjust to match the pipe diameter. However, there are instances where the elbows fail to update their diameter automatically. This issue usually occurs because Revit cannot locate the external data file that defines elbow diameters, specifically the Elbow-Generic.csv file.

To resolve this, you need to verify whether the file is missing or corrupted, or if Revit’s search path to this file is incorrect. The search path is specified in the Revit.ini configuration file, which is located in:

%APPDATA%AutodeskRevit

Follow these steps to access the folder and check the configuration:

1. Click on the address bar in Windows Explorer.
2. Type %APPDATA%AutodeskRevit and press Enter. This will display folders for all installed Revit versions on your computer.
3. Open the folder corresponding to your installed Revit version to locate the Revit.ini file.
4. Open Revit.ini using a text editor such as Windows Notepad.
5. Locate the LookupTableLocation parameter in the file, which usually points to a folder like C:ProgramDataAutodeskRVT 2014Lookup Tables. Confirm that this path exists and that the Elbow-Generic.csv file is present and accessible within this folder.

After making any necessary corrections, restart Revit. This should resolve the issue.

In fact, beyond pipe fittings and elbows, Revit adjusts other pipe fittings and pipeline accessories similarly. When the nominal diameter of a family changes, related parameters update automatically to drive the shape of the family accordingly. This behavior is enabled by Revit’s unique “Lookup Table” functionality.

Because pipe fittings and pipeline accessories vary in shape and parameters, multiple data files correspond to these families. Revit centrally stores these lookup table files in the folder defined by the LookupTableLocation parameter in the Revit.ini file.

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