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What is P&ID?

As engineers/engineering students, we always heard about P&ID. But what is actually P&ID? Well, for the benefit those of you who are not sure on this, P&ID is piping and instrumentation diagram/drawing (P&ID). It is defined by the Institute of Instrumentation and Control as follows:

-A diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on Instrumentation, Systems, and Automation Society (ISA) Standard S5. 1.

-The primary schematic drawing used for laying out a process control installation.

For processing facilities, it is a pictorial representation of

P&ID is an initialism that could mean:

A P & ID is a full diagrammatic representation of a process plant. Each piece of equipment is shown along with its connectivity to other equipment. It may be regarded as an enhanced process flow diagram which shows, in addition to the process itself, details such as control and instrumentation equipment, pump and pipe sizes etc. Each instrument / piece of equipment is shown by a symbol denoting its type (pump, sensor, valve etc.) and a unique identification number or tag for differentiation from others.

Information outsourced from wikipedia.org

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posted by Kipas Repair JB @ 12:53 AM,


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I’m Zaki. I used to be a project, process and chemical engineer. Few years ago I successfully became a Chartered Engineer (IChemE) and Professional Engineer (BEM). I'm now employed as a chemical engineering educator/researcher/consultant. Hope you like reading my blog. I welcome any feedback from you. My email: zaki.yz[alias]gmail.com. TQ!

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