PFD - Process Flow Diagram
The Process Flow Diagram (PFD) is a schematic illustration of a system showing the relations between major components, their operational values across different modes (minimum, normal, maximum), and key system information including flow, temperature, pressure, and fluid composition.
Process Flow Diagram (PFD) Overview
A Process Flow Diagram (PFD) or System Flow Diagram (SFD) is a schematic illustration showing:
Key Components to Include:
- Process Piping
- Major equipment symbols, names and identification numbers
- Control valves and operational valves
- Interconnection with other systems
- Major bypass and recirculation lines
- System ratings and operational values (minimum, normal, maximum flow, temperature, pressure)
- Fluid composition
Components to Exclude:
- Pipe class
- Pipe line numbers
- Minor bypass lines
- Isolation and shutoff valves
- Maintenance vents and drains
- Relief and safety valves
- Code class information
- Seismic class information