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
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