Download the BIM_IT_Pipe.msi file from the download page.

Run the installation file.

The installation wizard will appear. Follow the steps to complete the installation:

When you start Revit for the first time after installing BIM-IT Pipe, a security dialog will appear. Select Always Load to allow the add-in to run:

You can enter a serial number if you already have one, or continue using BIM-IT Pipe in trial mode:

Sometimes there may be extra spacing between the elevation tag and the pipe size tag.

To keep dimensions consistent across all view scales, the Pipe Size Tag tool adjusts the tag position based on the tag family size. If the original tag family label is too small to fit the text on a single line, Revit wraps the text into two lines. In that case, the total label height is used for the position calculation, which results in increased spacing.

To avoid this behavior, edit the Pipe Size Tag family and stretch the tag label so that the text fits on a single line.

Reload the tag family into the project and run the Pipe Size Tag tool again.