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A P&ID Should Include and Should not Include

This figure depict a very small and simplified P&ID:
p&id training

P&ID shows all of piping including the physical sequence of branches, reducers, valves, equipment, instrumentation and control interlocks. The P&ID are used to operate the process system.
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

A P&ID should not include:

  • Instrument root valves
  • Control relays
  • Manual switches
  • Equipment rating or capacity
  • Primary instrument tubing and valves
  • Pressure temperature and flow data
  • Elbow, tees and similar standard fittings
  • Extensive explanatory notes

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2 Comments on "A P&ID Should Include and Should not Include"

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Sampathkumar
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Sampathkumar
3 years 1 month ago

If you can guide people “How to read P&ID “that would be of great help to aspiring professionals.

jessy
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jessy
3 years 3 months ago

Nice post.It’s very informative.can you please share standards of valves?

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