PFD - Process Flow Diagram
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:
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
Related Topics
• Design Strategies
Piping systems design strategies - documentation, P&ID, flow diagrams - capacities and limits.
• Documentation
Documentation of process control systems - Block Flow Diagrams (BFD), Process Flow Diagrams (PFD), Piping and Instrumentation Diagrams (P&ID) and more
• Drawing Tools
2D and 3D engineering drawing tools.
• Process Control
Instrumentation and process control systems - design and documentation.
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PFD - Process Flow Diagram - Example
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