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PFD - Process Flow Diagram

The Process Flow Diagram - PFD, a schematic illustration of the system

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

A 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

This figure depict a small and simplified PFD:

Process Flow Diagram - PFD

System Flow Diagrams should not include:

  • pipe class
  • pipe line numbers
  • minor bypass lines
  • isolation and shutoff valves
  • maintenance vents and drains
  • relief and safety valve
  • code class information
  • seismic class information
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  • en: process flow diagram pdf
  • es: proceso de diagrama de flujo pdf
  • de: VerfahrensflieƟbild pdf
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