I know and I have a registration on the Smart Community.I've already contacted there. Answer from supports:
"There are no European or any other country/continent standards for piping catalogs deputed in CW Plant. Instead CW provides different catalog types related to different piping system and you can find them at C:\CADWorx Version\Plant\Spec\Legacy Imported CAT and Specs\Metric
There are only different standards for structural catalogs as per region and will be available in the CW root folder in your machine(C:\CADWorx Version\Structure\Library)"