How to Read Piping and Instrumentation Diagram

P&ID drawings, also known as Process and Instrumentation Diagrams, or Process and Control Diagrams, are essential to many industrial operations. This page is a basic guide on how to read and understand Piping and Instrumentation Drawings (P&IDs).

What is Piping and Instrumentation Diagram?

Piping and instrumentation diagram, also called P&ID, is a diagram used to show a graphical display of a complete system. It includes all piping, instruments, valves and equipment that the system consist of.
Here are a few aspects that you should pay attention to while reading a Piping and Instrumentation Diagram.

The first step to read a Piping and Instrumentation Diagram is to know how to read its symbols and shapes in the drawing. Edraw provides all kinds of symbols required in piping and instrumentation diagrams.


Discrete instruments:

Shared control/display
Computer function

Discrete instruments are indicated by circular elements. Shared control/display elements are circles surrounded by a square. Computer functions are indicted by a hexagon and programmable logic controller (PLC) functions are shown as a triangle inside a square.





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