Process Flow Diagram


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Process Flow Diagram - short version

A depiction of the flow of materials through a process, including any rework or repair operations; also called a process flow chart.



Process Flow Diagram - long version

A process flow diagram (PFD) is a diagram commonly used in engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations. Another commonly-used term for a PFD is a flowsheet. Typically, process flow diagrams of a single unit process will include the following:

* Process piping

* Major bypass and recirculation lines

* Major equipment symbols, names and identification numbers

* Flow directions

* Control loops that affect operation of the system

* Interconnection with other systems

* System ratings and operational values as minimum, normal and maximum flow, temperature and pressure

* Composition of fluids

Process flow diagrams of multiple process units within a large industrial plant will usually contain less detail and may be called block flow diagrams or schematic flow diagrams.



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