BFDs, PFDs & P&IDs

Block flow diagrams (BFDs), process flow diagrams (PFDs), and piping and instrumentation diagrams (P&IDs) are the graphical language refining and chemical engineers use to describe a process at progressively finer levels of detail. BFDs show major unit operations and mass balances, PFDs add streams and key equipment, and P&IDs specify every line, valve, instrument, and control loop needed to build and operate the plant. Fluency with these drawings is essential for design, troubleshooting, HAZOP, operator training, and management of change throughout the plant life cycle.

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