Fluid Codes System Codes Mechanical Abbreviation

Hi there,em
I'm putting a std. documentation for our company and wondering if any one can lead me to a code or reference regarding system codes, fluid codes and abbreviation. I've encountered the KKS System for system codes but to complicated for us. We want the basic reference if there are. Thanks for your help in advance.

Thanks JOP.
For the Fluid Codes (e.g. IA = Instrument Air...) Is there any code or std that list all the fluid codes?..

my experience fluid codes are generated by owner companys or engineering firms that generate their own codes for the client company, but nothing<strong> "standard"</strong>.

Thanks JOP for your reply.