4 replies to this topic

[alextor]

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?

[Bobby Strain]

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

[alextor]

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

[breizh]

hi,

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

good luck

Breizh

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

[gegio1960]

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!