P&ID (Piping and instrument diagram) & PFD (Process flow diagram).

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.
How to read a P&ID(Piping and instrument digram) drawing and PFD?
Learn to read instrumentation drawings.

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

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  1. Would you sir elaborate on what is the difference between piping and pipe-ling?

  2. Blog author send me a test mail to [email protected]

    Its really urgent

  3. Thanks Dear. Your Blog is also very nice & informative. I liked it & this is one of very few technical blogs which I like. Keep it up.


  4. Its a gud post regarding PID diagrams. You can find more on PIDs in the following link:

  5. Its Really more Informative and helpful for Beginner as well as for Experience person also. !!!!appreciated work!!!NICE JOB

  6. I want symbols of local push button & PLC operated pump

  7. To read and understand P&ID one should have basic concept on standard symbol, notation, abbreviation etc. Many articles are available on internet focusing on P&ID. Here is a link:

    This link provide sufficient reference on reading P&ID.

  8. Best reference for P&ID standard: http://piping-and-instrumentation-diagram.com

  9. http://piping-and-instrumentation-diagram.com

  10. Flow diagram: http://piping-and-instrumentation-diagram.com

  11. Thank you very much Sir, Its Really more Informative and helpful for Beginner,
    appreciated work.

  12. 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.