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Engineering ToolBox > PFD - Process Flow Diagram - Example

A Process Flow Diagram - PFD - example

A Process Flow Diagram - PFD - (or System Flow Diagram - SFD) shows relationships between major components in a system. A PFD also tabulate process design values for the components in different operating modes, typical minimum, normal and maximum values. A PFD does not show minor components, the piping systems, piping ratings and designations.

A Process Flow Diagram - PFD - should include:

• process piping
• major equipment symbols, names and identification numbers
• control, valves and valves that affect operation of the system
• interconnection with other systems
• major bypass and recirculation lines
• system ratings and operational values as minimum, normal and maximum flow, temperature and pressure
• composition of fluids

A Process Flow Diagrams - PFD - should not include:

• pipe classes
• pipe line numbers
• minor bypass lines
• isolation and shutoff valves
• maintenance vents and drains
• relief and safety valves
• code class information

Related documents:

• Piping & Instrumentation Diagram - P&ID

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