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A Process Flow Diagram (PFD) is a schematic illustration used in chemical and process engineering to indicate the general flow of plant processes and equipment. It displays the relationship between major components in a system.

Typically, a PFD includes major process piping, major equipment items, control valves, key bypass systems, and operational data such as temperature, pressure, and mass flow rates.

While a PFD shows the conceptual flow and major equipment of a process, a Piping and Instrumentation Diagram (P&ID) is much more detailed, showing all piping, instrument details, safety standards, and control schemes.

PFDs use standardized symbols defined by organizations like ISO or ANSI to represent equipment such as pumps, heat exchangers, columns, vessels, and compressors.

They serve as the foundational blueprint for designing a plant, helping engineers understand the system mechanics, optimize processes, train operators, and conduct safety reviews.