Process Diagram
September 4, 2017
Top 20 Food Processing Company
September 8, 2017

Process Diagram


Process & Instrumentation Diagram (P&ID)

A process and instrumentation diagram, also known as a P&ID, is a technical drawing of a process.  It uses graphical symbols for equipment and piping together with graphical symbols for process measurement and control functions.  A P&ID’s information typically spans multiple engineering disciplines and is a pictorial representation of piping and instrument details, safety and regulatory requirements, start-up and operational information, as well as control and shutdown schemes.

P&ID’s include the following information:

  • Permanent start-up and flush lines
  • Flow directions and interconnection references
  • Control inputs, outputs, interlocks and control system input
  • Interfaces for class changes
  • Identification of components and subsystems
  • Instrumentation and designations
  • Mechanical equipment with names and numbers
  • All valves and identifications
  • Process piping, sizes and identifications



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