In chemical and process engineering, process flow diagrams (PFDs) are utilized. The flow of chemicals and the equipment used in the process are depicted in these diagrams. A Process Flow Diagram usually simply depicts the major equipment and leaves out the details. PFDs are used to provide visitor information and to teach new employees.
A Process and Instrument Drawing (P&ID) has more information than a Process and Instrument Diagram (PFD). Major and minor flows, control loops, and instrumentation are all included. A Piping and Instrumentation Drawing is another name for a P&ID. Flowsheets are another name for these diagrams. Process technicians, as well as instrument and electrical, mechanical, safety, and engineering personnel, use P&IDs.