Considerations in P&ID Verification


Hello good people of the world! Today’s post is about Piping and Instrumentation Drawing (P&ID) verification. Of course, the P&ID is one of the most important design documents for a given system, detailing piping configuration and class, major component location and details, instrumentation, and control points, and thus is an important part of any commissioning and qualification effort.

So what should you look for in P&ID verification? Well, it does depend on where you are in the project, but here’s some tips:

At FAT (Factory Acceptance Test) or construction walkdown (for stick-built systems):

FAT or construction walkdown will be likely the first opportunity to verify a P&ID, and resources should be spent to ensure drawings are as accurate as possible at this early stage. Things to check:

  1. Components are in the correct sequence and are correctly tagged
  2. Manual valves operate through the full range
  3. Piping and tubing is installed and the correct diameter
  4. Connection types are as specified on the drawing (e.g. tri-clamp)
  5. Flexible hoses are of the correct length
  6. Sample points are present and accessible
  7. Components are visually clean and undamaged
  8. Filter housings, check valves, and control valves are installed in the correct orientation
  9. Instruments and automated valves are installed in the correct orientation
  10. Component nameplates are visible and correct
  11. Slope of critical liquid lines. See ASME BPE-2014 for a detailed method (not free)
  12. No deadlegs

What do you look for in P&ID verification?

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