PFD - Process Flow Diagram

A Process Flow Diagram - PFD - (or System Flow Diagram - SFD) shows the [B]relationships[/B] 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:

[LIST][*]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[/LIST]
This figure depict a small and simplified PFD:
[img]http://www.egpet.net/vb/images/imported/2012/01/18.gif[/img]
System Flow Diagrams should not include:

[LIST][*]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[/LIST]