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P&ID - Piping and Instrumentation Diagram

P&ID is a schematic illustration of a functional relationship between piping, instrumentation and system components

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P&ID's shows all piping including physical sequences of branches, reducers, valves, equipment, instrumentation and control interlocks.

The P&ID's are used to operate process systems.

A P&ID should include:

  • Instrumentation and designations
  • Mechanical equipment with names and numbers
  • All valves and their identifications
  • Process piping, sizes and identification
  • Miscellaneous - vents, drains, special fittings, sampling lines, reducers, increasers and swagers
  • Permanent start-up and flush lines
  • Flow directions
  • Interconnections references
  • Control inputs and outputs, interlocks
  • Interfaces for class changes
  • Seismic category
  • Quality level
  • Annunciation inputs
  • Computer control system input
  • Vendor and contractor interfaces
  • Identification of components and subsystems delivered by others
  • Intended physical sequence of the equipment

The figure below illustrates a very small and simplified P&ID:

Piping and Instrumentation Diagram - P&ID

A P&ID should not include:

  • Equipment rating or capacities
  • Instrument root valves
  • Control relays
  • Manual switches and indicating lights
  • Primary instrument tubing and valves
  • Pressure temperature and flow data
  • Elbows and similar standard fittings
  • Extensive explanatory notes

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Engineering ToolBox Sketchup Extension - piping components

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This page can be cited as

  • Engineering ToolBox, (2003). P&ID - Piping and Instrumentation Diagram. [online] Available at: https://www.engineeringtoolbox.com/p-id-piping-instrumentation-diagram-d_466.html [Accessed Day Mo. Year].

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