UPDATE 25/04/2022: Here below you can download the version 1.0 of a calculation sheet to size orifice plates. The calculation sheet has been updated with an italian and english guide that explains how to use it.
The calculation method is the same used by the Crane Technical Paper 410, it is valid only for concentric orifices, and allows the sizing of liquid and vapours fluids.
Click Here to download the program. Below a screenshot of the program.