Resid viscosity determination 1

[tchitz]

Lab results of assay of particlar crude I am analyzing does not include viscosity at 122oF of the resid, i.e, 1025+ cut. What is the best way to determine the implied viscosity of the 1025+ resid @ 122oF?

Viscosity @ 122 oF of different cuts from 374 oF to 1025, whole crude, and 650+ are available.

 

[StoneCold]

The Resid is probably a solid at 122F. I have worked with several and they all need to be closer to 250F to get a viscosity.

 

[tchitz]

Thanks! The assay has the viscosity at higher temperatures such as 250. However, The model I am using needs an input of viscosity at 122 oF. What I did was back calculate the 1025 + viscosity from the 650+ and the whole crude viscosities. I've arrived at similar answers using both but I'm wondering if there is a more appropriate methodology.

 

[jmw]

Go here and download the ASTM D341 spreadsheet. (

http://www.viscoanalyser.com/downloads.html)

This is a spreadsheet for determining viscosity at different temperatures for hydrocarbons.
It works very well with bitumens and asphalts, so don't worry about it being pre-set with heavy fuel oil data.

If you have the lab results at two different temperatures for some samples, simply load this data in.
For your unknow fluid where you have only one viscosity/temperature pair you need to experiment with different values at a second temperature until you get good values for the A & B constants.

Whether or not the fluid is actually solid at 122degF or not is imaterial to the prediction using these curves.

If you have any problems (e.g. the answer overflows the column) come back to me and i will sort it ut for you).

JMW

http://www.viscoanalyser.com

Eng-Tips: Pro bono publico, by engineers, for engineers.

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[tchitz]

Hi, jmw

thanks a lot! How do I increase the width of the columns?
How do I change the scale of the Y axis?

 

[tchitz]

Hi, jmw

You don't have to answer my previous question. I calculated the viscosities outside of your model using your formula and got the answers I needed. They are pretty close to my earlier calculations. Thanks a lot!

tchitz

 

[jmw]

Hi tchitz,
my appologies, you need to download it again.

It now has column format enabled so you can adjust the column width accordingly.

The graph is not protected so you double click just below or to the left of the axis you want to change which should bring up the dialogue box.


JMW

http://www.viscoanalyser.com

Eng-Tips: Pro bono publico, by engineers, for engineers.

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[jmw]

OK, fine.

JMW

http://www.viscoanalyser.com

Eng-Tips: Pro bono publico, by engineers, for engineers.

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.