Jump to content

Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog


Process Simulation - Allowable Error?

4 replies to this topic
Share this topic:
| More

#1 alextor


    Junior Member

  • Members
  • 12 posts

Posted 29 November 2019 - 12:10 AM

Plant data and relevant process simulation results always have a difference in values (temperature, pressure, concentration).

The smaller this difference (error - %), the more accurate the model.

But what error values (average and maximum) are allowable in practice? 1%, 5%, 10%? 

In what documentation is a allowable error indicated?

#2 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,892 posts

Posted 29 November 2019 - 05:41 PM

There is no general answer to your question. If you are more specific, you may get some advice. Often errors are due to the wrong model.



#3 alextor


    Junior Member

  • Members
  • 12 posts

Posted 04 December 2019 - 01:37 AM

Simulation petroleum refining unit. Full material balance includes columns, heat exchangers, pumps, vessel, reactors....

#4 breizh


    Gold Member

  • ChE Plus Subscriber
  • 4,696 posts

Posted 04 December 2019 - 01:50 AM


Make you sure fields data are properly monitored with calibrated sensors .

good luck


Edited by breizh, 04 December 2019 - 06:15 AM.

#5 gegio1960


    Gold Member

  • Members
  • 497 posts

Posted 04 December 2019 - 12:22 PM

in other words...you will have errors both in simulations and in field data...often in different directions :-)

the error is highly dependant by the kind of characterization (eg distillation curves vs chemical compositions) of the feedstocks and the kind of process (eg a CDU/VDU vs a mature licensed process).

moreover, the magnitude of possible errors depends by the observed parameters (eg an operating temperature vs a cetane number).

nowadays the design margins, that should allow to compensate the uncertainties, are generally limited to 10% and only foreseen for the single items, without the previously adopted capacity margins on units.

good luck!

Similar Topics