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Process Simulation - Allowable Error?


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#1 alextor

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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

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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.

 

Bobby



#3 alextor

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Posted 04 December 2019 - 01:37 AM

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



#4 breizh

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Posted 04 December 2019 - 01:50 AM

hi,

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

good luck

Breizh


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


#5 gegio1960

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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!






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