Process Flow Diagrams
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A Process flow diagram (PFD) is a diagram 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 or minor instrumentation.


PFD's are sometime called flowsheets

Typically, process flow diagrams will include (but may not) :

Primary Process piping

Major equipment items

Control valves and other major valves

Connections with other systems

Major bypass and recirculation streams

Operational data (temperature, pressure, flow, density, etc.), often by stream references to a mass balance.

They generally cover a single part of the process and several are required for a complete process.

For more on P&ID's and PFD's see the University of Michigan Chemical Engineering Controls Wiki.

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