Instead of creating custom part orifice plate, set up a proper part in a catalogue and insert in a pipe spec. Than you have a tagged orifice plate.
Or you have to check the project settings:
Plant 3D class definitions \ piping and equipment \ pipe run component \ orifice plate
Check if is there a tag format. If there is not, than you have to create one.
I added the orifice plates to the pipespec, but that did not solve the problem.
The solution was actually add a TAG Format to the Plant 3D Class Definition, in my case I added on "root" pipe run component for all.
Thank you very much.