PFD - Process Flow Diagram - Example

A Process Flow Diagram - PFD - example

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

A Process Flow Diagram - PFD - should include:

  • process piping
  • major equipment symbols, names and identification numbers
  • control valves and valves that affect the operation of the system
  • inter-connection with other systems
  • major bypass and recirculation lines
  • system ratings and operational values as minimum, normal and maximum flow, temperatures 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:

http://www.osha.gov/OshStd_gif/Process.gif

Related Topics

  • Documentation - Documentation of process control systems - Block Flow Diagrams (BFD), Process Flow Diagrams (PFD), Piping and Instrumentation Diagrams (P&ID) and more

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