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QSK
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Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1

Viscosity of HFO

03/30/2010 5:29 AM

The viscosity of Heavy Fuel Oil being quoted by my supplier is listed as 180cst at 50 deg.C. The CAT engines for which this fuel will be used (model MAK 16CM32) requires HFO (CIMAC E25 RME180) with viscosity of 25cst at 100 deg.C. Is there a formula I could use to extrapolate the viscosity value of HFO from my supplier from 50 to 100 deg.C ? My HFO supplier operates in a protected market and not willing to make an effort.

Thanks,
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Pathfinder Tags: Heavy Fuel Oil viscosity
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Anonymous Poster
#1

Re: Viscosity of HFO

03/30/2010 11:20 PM

Do not know of any formula, but from one of my old books I see that long residue is around 180 to 200 cSt at 50 deg C and around 20 to 30 cSt at 100 degC so you could well be OK.
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Medo00
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Join Date: Mar 2010
Posts: 1
Good Answers: 1
#2

Re: Viscosity of HFO

03/31/2010 2:36 AM

Hi,

in the book "RTA General Technical Data for RTA52, RTA 62, RTA 72 and RTA 84 M marine diesel engines", Issue 1987/88, Sulzer Brothers Ltd there is a viscosity temperature diagram for fuel oils on the page C4-3. From this diagram, the fuel oil with the viscosity of 180 cSt at 50 deg C will have 22 cSt at 100 deg C. I do not know for any formula for viscosity change calculation.

With best regards,

Prof. Vladimir Medica PhD

Faculty of Engineering, University of Rijeka, Croatia
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QSK
Commentator

Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1
#3
In reply to #2

Re: Viscosity of HFO

03/31/2010 3:55 AM

Thanks for your help. This surely solve my problem.
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Hellbender
Participant

Join Date: Mar 2010
Posts: 1
#4

Re: Viscosity of HFO

03/31/2010 4:59 AM

Check out the following viscosity chart. http://www.bobistheoilguy.com/visc.html
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QSK
Commentator

Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1
#5
In reply to #4

Re: Viscosity of HFO

03/31/2010 5:37 AM

The chart given in the link you provided gives viscosity of various grades of lube oils. Not sure if it can be applied to heavy fuel oil ?
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fluidguy
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Join Date: Mar 2010
Posts: 4
#6

Re: Viscosity of HFO

03/31/2010 5:49 AM

Petroleum viscosity is temperature driven and given by a natural log function called the 'Andrade" correlation. Standard ASTM charts are the way to go but this calculator is accurate;

http://www.eskoindustries.com/viscadv.php
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QSK
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Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1
#7
In reply to #6

Re: Viscosity of HFO

03/31/2010 6:08 AM

Thanks. A very useful tool indeed but it requires two known viscosity values at two different temperatures in order to calculate viscosity at a required third temperature. I only have one viscosity value available. In any case, Prof. Vladimir Medica has already answered my question.

I thank all the respondents for their help.
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ELEMAN
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Join Date: Sep 2006
Posts: 64
#8
In reply to #7

Re: Viscosity of HFO

04/03/2010 12:56 PM

QSK, you can access to this document and find out there the answer to your enquiry. http://home.houston.rr.com/electricpete/eng-tips/ViscosityVsTemperatureCalculator:xls.

electricpete is a Honorable Member of the Eng-Tips Forum.
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ELEMAN
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Join Date: Sep 2006
Posts: 64
#9
In reply to #8

Re: Viscosity of HFO

04/03/2010 1:12 PM

Hello everybody:

O.K., there is something wrong in the link submitted, omit the "rr" and everything will be all right.
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QSK
Commentator

Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1
#10
In reply to #9

Re: Viscosity of HFO

04/03/2010 4:30 PM

Eleman, The link doesn't work with rr, without rr it goes to houston city guide, with no reference to the topic. Any clue ?
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ELEMAN
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Join Date: Sep 2006
Posts: 64
#11
In reply to #10

Re: Viscosity of HFO

04/04/2010 11:50 AM

Hello everybody:

QSK, I am really sorry, but I made a mistake. The correct link is http://home.houston.com/electricpete/eng-tips/ViscosityVsTemperatureCalculator.xls.

If you click it directly from this thread, it appears another place in the web; but, if you access that link through Google, you will be addressed to the thread in the Eng-Tips Forum.

An alternate way is the link www.eng-tips.com/viewthread.cfm?qid=181824.

Once again, I am sorry.
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QSK
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Join Date: Nov 2006
Location: Dubai
Posts: 67
Good Answers: 1
#12
In reply to #11

Re: Viscosity of HFO

04/04/2010 4:48 PM

Very useful info. Thanks a lot.
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Husnain
Participant

Join Date: Jan 2011
Posts: 1
#13
In reply to #6

Re: Viscosity of HFO

01/14/2011 3:15 PM

MR. Fluid guy, can u please give the formula against which this calculator works? I would really be grateful.
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Users who posted comments:

Anonymous Poster (1); ELEMAN (3); fluidguy (1); Hellbender (1); Husnain (1); Medo00 (1); QSK (5)

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