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Symbols For Process Flow Diagrams and Engineering Line Diagrams

The following symbols are generally in accordance with BS 1553-1...and BS 5070

Different Line Types.

Different Pipe Supports.

Symbols for Fitting and Representations.

Symbols for Valves


Symbols for Valve Actuators.

Symbols for Instruments.

Instrument Indentifiers

Measured Variable Type of Conditioner Type of Component
F = Flow R = Recorder T = Transmitter
L = Level I = Indicator M = Modifier
P = Pressure C = Controller E = Element
Q = Quantity A = Alarm  
T = Temperature    

Symbols for Process Equipment.

The level of detail for the equipment relates to the type of schematic being produced.   A Process Flow Sheet will only show the basic level of information sufficient to show the essential process flowpaths.   An Engineering Line Diagram of P & ID drawing will show a much more detailed representation.

Line Tags and Equipment Identification.

Links Providing information on Drawing
  1. Process Flow Diagrams... A short download document including some symbols and some diagrams
  2. Designing a Proces Flow Sheet... A download document including some symbols and some diagrams

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Last Updated 19/01/2013