Talk on PFD and P&ID Development for UM 4th Year Chem Eng Students


Common Mistakes

TYPE Description
Presentation
  • Inconsistencies & errors
  • Too much detail (See Note 1)
  • Batch processes not clearly presented
  • Stream labels not oriented upright
Process Engineering-related
  • Use of fired heater for column reboiler (See Note 2)
  • Unrealistic design parameters (See Note 3)
  • In reactors, heating and cooling not considered
Controls
  • No control loops shown
  • Impractical control schemes
Sample 1 Sample 2

Notes

  1. Use block diagrams within PFDs if overall process is too complicated
  2. High skin temperature in fired tubes can cause coking of HC components - use ony if there are no other practical means to achieve required temperatures
  3. e.g. differential pressure for pump is only 1 bar

Hints

  1. Review and understand intent of production process
  2. Make flow scheme simple and elegant
  3. Conduct Team Review to solicit comments and identify errors/omissions
 Back to main menu