PFD - Process Flow Diagram

The Process Flow Diagram - PFD, a schematic illustration of the system

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

This figure depict a small and simplified PFD:

Process Flow Diagram - 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

  • Documentation - Documentation of process control systems - Block Flow Diagrams (BFD), Process Flow Diagrams (PFD), Piping and Instrumentation Diagrams (P&ID) and more
  • Design Strategies - Piping systems and design strategies - documentation, P&ID, flow diagrams - capacities and limits
  • Process Control - Instrumentation and process control systems - engineering and documentation

Related Documents

Tag Search

  • en: process flow diagram pdf
  • es: proceso de diagrama de flujo pdf
  • de: VerfahrensflieƟbild pdf

Search the Engineering ToolBox

- "Search is the most efficient way to navigate the Engineering ToolBox!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro. Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close