Process flow diagram (PFD) symbols are used to represent piping systems, equipment and flow paths in engineering drawings. These standardised symbols allow engineers to clearly communicate system layouts and operating principles.
This page provides a reference for common line types, pipe supports and piping symbols used in process flow diagrams and engineering line drawings in accordance with recognised standards.
Process flow diagram symbols are graphical representations used to describe process systems. They are widely used in mechanical, chemical and process engineering to illustrate the flow of fluids, equipment connections and control elements.
The following symbols are generally in accordance
with BS 1553-1...and BS 5070
v
| 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 |
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.
Further information on engineering drawing symbols and standards can be found on related pages covering surface finish, geometric tolerances and technical drawing conventions.
Links Providing information on Drawing
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