If you are interested to know more about subjects like Standards and Guidelines. read our free introduction to these concepts in our article P&ID Diagram Basics – Part 2 – International Standards

If you are interested to know more about subjects like Functional Identification and Instrument Numbering. read our free introduction to these concepts in our article P&ID Diagram Basics – Part 3 – Functional Identification and Naming Conventions

Piping and instrumentation diagram (P&ID) are of fundamental importance in process automation and process industry. It gives an overall view of the entire process loop of the facility. The Automation, Systems and Instrumentation Dictionary, 4th edition’s definition for a Piping and Instrumentation Drawing (P&ID) tells what they do, P&IDs “show the interconnection of process equipment and the instrumentation used to control the process”.

They are used as an element of communication between engineering, plant operation, maintenance and construction, since they show detail information of the plant relating to equipment, pipeline, instrumentation and common services.
P&ID must be maintained accurately and updated.

The creation of the instrumentation diagram or p&id constitutes an important phase in the design of a process plant.

It is a diagram of the systems / equipment present in a section of the plant.