So, if you are moving from one company to another, dont rely on your memory and refer the lead sheets for symbols.
Process Flow Diagram Symbols How To Read PIDIf you want to learn how to read PID and PFD, you must know the legend used in these drawings.PFS means Process Flow Scheme and PEFS means Process Engineering Flow Scheme. Here, I have tried to cover symbols that regularly used on the PID and PFD. Process Flow Diagram Symbols Full List OfThere are other symbols also you can check the full list of the symbol by visiting this link. I advised you before you start working on an actual plant or construction project you should check the project-specific symbol library which is also known as PID lead sheets or PID legend drawing. The level of information available on PID symbols and on PID may change from company to company, but more or less they provide similar information. PID and PFD Symbols PID symbols are a graphical representation of physical equipment that installed on the field. There are few ISO and British standards available that provide symbols and best practices to draw PFD and PID such as, ISA S5.1, BS 5070, and ISO 10628. Pumps and Turbine PID Symbols The symbols for various types of rotary equipment such as a centrifugal pump, vacuum pump, and also positive displacement pumps such as gear and screw types. PID Symbols for Compressor The symbols for the compressor such as reciprocating, centrifugal, rotary, liquid ring, and turbine driven. Heat Exchanger PID symbol These are the symbols for the heat exchanger. On the drawing you can see both types of symbols are used the one on the right-hand side are more frequent than the one on the left-hand side. ![]() Here you can see the symbols for dome roof tank, fixed roof tank, and internal floating roof tank. In case the tank is only a floating roof than there will be no roof on this symbol. There are two types of the tower are shown here, one with column internal, and the other is without internals. There are different types of the internals are used in the column and for that different symbols are used. Here in the distillation tower, you can see the different types of internal, such as mist mat, pipe distributor, liquid spray distributor, vortex breaker, baffle plate, packing bed, and some other types of trays. Line Symbols for PFD and PID The below image shows various lines and connections used on PFD and PID. Main process lines are shown as dark black lines whereas minor lines are shown as thin black lines. You can see the symbols for pneumatic, hydraulic, and capillary lines also. Electric signals are shown as a dotted line, and Electromagnetic signals are shown as a wave on the solid line. PID Symbols for Piping Valves This is the trickiest part of reading PID and PFD. If you remember that I have mentioned that PID symbols change from company to company, valves symbols are the one that changes most of the time.
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