If you are interested to know more about subjects like Purpose, Owner and Contents & Conventions. read our free introduction to these concepts in our article P&ID Diagram Basics – Part 1 – Purpose, Owner and Contents.

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

This third article on P&ID diagrams deals with the functional identification and the conventions when naming the elements present in a P&ID diagram.

The reason is quite simple, users of instrumentation and control systems need some method to identify the equipment so that they can administer the engineering, the purchases, the installation and the maintenance of those systems.

But the identification must follow some basic rules to have a good documentation.Good documentation is the basis for good engineering and good maintenance of the facilities.