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
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