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P&ID Symbol Legend

> Edraw Symbol > P&ID Symbol Legend
Posted by Daniel Belisario | 01/13/2021

Piping & Instrumentation Diagram (P&ID) is a graphical and schematic representation of the functional relationship between piping, instrumentation, and system equipment components used in the field of automation and instrumentation. There are usually mostly made and used by engineers designing a manufacturing process for a particular physical plant.

Piping and Instrumentation Diagram Symbols Detailed Documentation provides a rich set of shapes & symbols for documenting P&ID and PFD, including shapes for the instrument, valves, pump, heating exchanges, mixers, crushers, vessels, compressors, filters, motors, and connecting shapes.

Symbols Used in P&IDs

P&ID components are represented by several standard symbols, which are not to scale, nor are their dimensions accurate. The symbols are always labeled using words, letters, and numbers to better identify and specify the components being represented. Furthermore, one should consider that these diagrams don't always represent the targeted physical locations nor the proximity of each component involved. These symbols' main function is to illustrate the system's process rather than serve as a map.

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Free Download P&ID Software and Get Editable Symbols

PID Legend


Where to find all P&ID symbols?

With EdrawMax, you would be exposed to a broad range of different P&ID symbols as well as a variety of their templates. This diagramming tool also offers an amazing interface with drag-and-drop intuition along with preset drawing symbols that make it much easier to create your own P&ID diagrams. You can locate the predesigned P&ID symbols under the Industrial Automation & PID category from the EdrawMax library.

EdrawMax: a swiss knife for all your diagramming need

  • Effortlessly create over 280 types of diagrams.
  • Provide various templates & symbols to match your needs.
  • Drag and drop interface and easy to use.
  • Customize every detail by using smart and dynamic toolkits.
  • Compatible with a variety of file formats, such as MS Office, Visio, PDF, etc.
  • Feel free to export, print, and share your diagrams.


When you get into the workspace of EdrawMax, the library will open the left side of the canvas. You can find all the predesigned P&ID symbols under the Industrial Automation and PID category, which will be used for representing the functional relationships between piping, instrumentation, and system equipment units.


How to create a P&ID diagram with P&ID symbols?

Look at the video below to know how to use P&ID symbols and make a P&ID with EdrawMax.


Tips on creating a P&ID diagram

There are some basic steps that you can follow when creating a P&ID through computer software, including:

1. Develop and confirm an equipment list using the library's symbols after being certain about the list.

2. Connect the necessary pipes and equipment and review the details. You can go over the process a couple of times with a colleague to search for any imperfections.

3. Share your creation with collaborators.

Get Started! You Will Love This Easy-To-Use Diagram Software

EdrawMax is an advanced all-in-one diagramming tool for creating professional flowcharts, org charts, mind maps, network diagrams, UML diagrams, floor plans, electrical diagrams, science illustrations, and more. Just try it, you will love it!