PID and PFD Drawing Symbols and Legend list (PFS PEFS)
PFD is Process Flow Diagram. PID is Process or piping Instrument Diagram. PFS means Process Flow Scheme and PEFS means Process Engineering Flow Scheme. Here, I have tried to cover symbols that regularly used on the PID and PFD. There are other symbols also you can check the full list of the symbol by visiting this link. I advised you before ...