PFD

A Process Flow Diagram - PFD - (or System Flow Diagram - SFD) shows the relationships between the major components in the system. PFD also tabulate process design values for the 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

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