Piping labels in the drawing view model are incorrect. For instance, instead of the labeled pipe displaying as 2", the pipe displays as 2 FT.
The piping rule label is derived from the Working Units Sub Units label in the dgn model. If this is set incorrectly, then you will also get the same label on the drawing view piping labels.In the drawing view model, if you need to change more than one piping label, you should make sure that your working units in the 3D model are correct, ie. " or inch, whatever label you want to use. Then go back to the drawing model and select Reference Presentation, click on the Rule, Modify Rule and then select Edit Rule from the Apply Drawing Rules dialog, then OK. This will refresh all of the piping labels that are used in the file to reflect the changed working units label.You could also just select the pipe and right click on it to select "Reset Annotation". This will refresh one pipe at a time.