P&ID: Schematic illustration of instruments and their interconnection is called P&ID.

PFD:Process flow diagram.PFD gives an overview of the plant process.PFD is a simplified version of P&ID.
Symbols,circles and lines are used to represent instrument and their interconnection.For identifying instruments and pipe lines tag numbers are used.For reading P&ID(Piping & instrument diagarm) one must be familiar with standard instrument symbols and standard identification letter.


Instrument Location:The presence or absence of a line determines the location of the physical device.Some instruments are a part of a distributed control system where a specific controller or indicator can be selected from many others but shown in one location.


Piping and connection symbols:These symbols are used to identify how the instruments in the process connect to each other.And what type of singnal is being used.

Valve symbols.

Learn to read instrumentation drawings.

Tag: P&ID,Piping and instrument diagram,PFD,Process flow diagram,Valve symbol,Instrument symbols



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12 thoughts on “P&ID (Piping and instrument diagram) & PFD (Process flow diagram).

  1. Piping and Instrument Diagram is a very important for a person sitting in the control room. Each and every part of the power plant can be easily operated and the placement of the devices can be easily recognized in case of any problem. And it can be solved easily.

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