Hysys Petroleum Assay

hello,

I want to know how to add overlapping cuts in Petroleum Assays in ASPEN HYSYS V11. 

Thanks in advance.

Edited by nasim303, 18 January 2023 - 03:58 AM.

If I understand your question accurately, you just add in the measured products as separate streams to the model and then flow them together in the flowsheet to combine them.

If I understand your question accurately, you just add in the measured products as separate streams to the model and then flow them together in the flowsheet to combine them.

Thanks for your kind concern. But actually I meant to say that when inputting the assay data (like, ASTM D86 or other bulk properties), a whole crude and multiple cut options there are to input in HYSYS>>Properties>>Petroleum Assays (screenshot attached in my main post) . But the problem is for each consecutive cut the IBP is equal to the FBP of the immediate previous cut! But practically there are overlapping in the cuts of the crude. So How we can input those data? (I shared a sample of overlapping crude in my main post.)

Edited by nasim303, 18 January 2023 - 04:00 AM.

My another question is when I characterize the assay after inputting the data why some manually inputted data is manipulated by HYSYS?

is it possible to keep all manually inputted data unchanged?

You should have many more than 5 petroleum cuts in your assay for pseudocomponents. A good range to start would be boiling points no greater than every 15 C apart. Assay component distribution is not the same as crude product ranges. There will be overlapping boiling points in the crude column products. Without enough petroleum cuts in your assay range, you will not get useful results in your model. The material that boils higher than your heaviest defined assay cut gets combined into the last cut and this will change your input. Your distillation curve input shows 'loss' and 'residue' which acknowledges that the IBP and FBP do not reflect the boiling points of the lightest and heaviest components. The simulation software is fitting your stream input to a curve in order to characterize it according to the assay pseudocomponents you requested.

Enter the data as a single stream property.  The hypo-compents need to be allready in your componenet list, an easy to do that is add an assay and it will ask you which list of hyps to use.  Don't use the list that goes to 1150C because it's total nonsense, use the 850C one.

IBP and FBP are also nonsense usually, they should be entered as 1% or 99% or estimated using a probabity plot, or just leave them out and Hysys will estimate using a probability plot.

Edited by SilverShaded, 18 January 2023 - 09:34 AM.

You should have many more than 5 petroleum cuts in your assay for pseudocomponents. A good range to start would be boiling points no greater than every 15 C apart. Assay component distribution is not the same as crude product ranges. There will be overlapping boiling points in the crude column products. Without enough petroleum cuts in your assay range, you will not get useful results in your model. The material that boils higher than your heaviest defined assay cut gets combined into the last cut and this will change your input. Your distillation curve input shows 'loss' and 'residue' which acknowledges that the IBP and FBP do not reflect the boiling points of the lightest and heaviest components. The simulation software is fitting your stream input to a curve in order to characterize it according to the assay pseudocomponents you requested.

I got your answer for the last part. The red color part answer is not clear to me unfortunately. Can you please make me this understand again?

My another question is when I characterize the assay after inputting the data why some manually inputted data is manipulated by HYSYS?

is it possible to keep all manually inputted data unchanged?

Hysys smooths out the curve using a probability plot.  So some distillation numbers may get changed.  Decades ago this was often done manually using probability graph paper.

Just to add to some previous replies.  Occasionally Naphtha regions are modelled with real components using GC analysis data.  Simulators like Hysys do have all the components in the database to do this and the number of components in the Naphtha region varies by crude but can be upto around 200.  Unfortunatley GC data does identify mercaptans or thiophenes so it takes a bit of creatviity to include the sulphur curve in the Naptha region.