Hello Tony and thanks again.
This is the tag structure:
| Total plant | System code | Equipment code unit | Component code | ||||||||||
| Designation | G | F0 | F1 | F2 | F3 | Fn | A1 | A2 | An | A3 | B1 | B2 | Bn |
| Data character | A or N | N | A | A | A | NN | A | A | NNN | A | A | A | NN |
Its a general form that stands for all of the P&ID's components (the codes will be different according to the component they describe).
F1F2F3, A1A2 and B1B2 are codes from the KKS list.
It is according to the KKS format, I am not sure if this is it's standard tag format though.
Thank you very much
and Best regards
Ronit