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Volume reduction in mixing of liquid hydrocarbons
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Source：Internet Author：Unknow Pubdate：2008-04-15
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sav455 (Chemical)
20 Oct 07 23:08
Hi All,
I am required to calculate the reduction in volume of liquid hydrocarbons upon mixing.
The detail of the problem is as follows: I have three stream: naphtha, distillate and gas oil.These ssreams can be routed to different tanks.I did a quick simulation in HYSYS and found that there is actually some loss in volume upon mixing these streams. My problem is how do I know how much volume reduction will take place upon mixing of these streams, assuming all other conditions such as pressure and temperature remain same.Is there any database/procedure for the same??(In addition to doing some thermodynamic calculcation involving excess property which is volume in this case or using a simulator like HYSYS.)
Thanks,
Sav
BigInch (Petroleum)
22 Oct 07 9:07
Calculate the volumetric shrinkage percentage according to section 5.3 of the American Petroleum Institute Manual of Petroleum Measurement Standards. 字串7
http://choa.ab.ca/documents/May9TL-ppt.pdf http://virtualpipeline.spaces.msn.com
jmw (Industrial)
22 Oct 07 9:43
BigInch
Thanks for the link to the CHOA paper (star!).
I could wish for a similar paper from another company in Alberta which would show how inline viscosity has reduced their diluent usage (with heavy crude, but other users for asphalt/bitumen report the inline system more accurate than the lab methods they employed previously) saving CAN$millions per year per system.
Of course, there are inline viscometers and then there are other inline viscometers.
The most effective method is to use the dual viscometer method which eliminates slope errors, since the viscosity is measured online simultaneously at two different operating temperatures; this allows A and B in the ASTM D341 equation to be solved for each calculation update cycle. Accuracies of (+/-)1.0% reading at reference temperature are achievable. 字串9
For pipeline applications it is usual to also use an inline density meter rather than depend on the viscometer density measurement as density is more accurately determined and is one of the pipeline criteria.
By the way, do you know anything about the Syndilbit Viscosity Blend Calculator?
Sorry, Sav455, to go off topic.... didn't see the shrinkage calculation in the CHOA link.... but a nice find anyway.
JMW
www.ViscoAnalyser.com
BigInch (Petroleum)
22 Oct 07 11:48
I'm looking at this one now. Can't figure out if it'll do it or not.
http://www.capp.ca/raw.asp?x=1&;dt=NTV&e=XLS&dn=88025 http://virtualpipeline.spaces.msn.com
sav455 (Chemical)
22 Oct 07 14:41
Thanks Biginch and JMW.
JMW, you did not go off the topic. In fact you talked very much in relation to what I am supposed to do. 字串4
Thanks.
SAV
BigInch (Petroleum)
22 Oct 07 14:47
i just thought that if you wanted that info, you just might also want some viscosity data too. I always do. http://virtualpipeline.spaces.msn.com
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