Using P&ID to Establish Location and Asset Hierarchies, Paper360º July/August 2025

Piping and Instrumentation Diagrams (P&ID) are foundational documents that give engineering, operations, and maintenance staff insight into the elements, interconnections, and relationships a system may have. As with any architectural type of diagram, they have a language of their own.

Often, the contractor who built the system will provide P&ID as part of their “as-built,” package. How consistent they are with reality is always a question worth asking.

It is a good idea to verify P&ID against what is out on the production floor or in the walls. They will be close, but you will always find opportunities for a redline to adjust the drawing. Most likely your company has an official process to get these changes made.

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