Appendix: Resources for Building PFDs and P&IDs
Resources for Building PFDs and P&IDs
- Visio: available through the CHBE Parallel’s Client portal, as well as the CHBE computer labs
- Visual Paradigm Online: includes specific process engineering equipment
- Draw.io
- AspenPLUS: you will use this in CHBE 376
Here is a thorough table of control symbology:
| First Letter (X) | Second or Third Letter (Y) | |
|---|---|---|
| A | Analysis | Alarm |
| B | Burner Flame | – |
| C | Conductivity | Control |
| D | Density or Specific Gravity | – |
| E | Voltage | Element |
| F | Flowrate | – |
| H | Hand (Manually Initiated) | High |
| I | Current | Indicate |
| J | Power | – |
| K | Time or Time Schedule | Control Station |
| L | Level | Light or Low |
| M | Moisture or Humidity | Middle or Intermediate |
| O | – | Orifice |
| P | Pressure or Vacuum | Point |
| Q | Quantity or Event | – |
| R | Radioactivity or Ratio | Record or Print |
| S | Speed or Frequency | Switch |
| T | Temperature | Transmit |
| V | Viscosity | Valve, Damper, or Louver |
| W | Weight | Well |
| Y | – | Relay or Compute |
| Z | Position | Drive |
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