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Density of blended residual fuel oil
3

Density of blended residual fuel oil

Density of blended residual fuel oil

(OP)
Hello everybody:

For residual fuel oil blended, one of the ways to calculate the Viscosity Blending Index is by solving the Refutas equation for each component. Then, it is calculated the Viscosity Blending Number of the blend. Finally, the viscosity of the blend is calculated by solving the invert of the Refutas equation.

I would like to know if exists a similar way to calculate the density of the resulting product of the blending.

Thanks

RE: Density of blended residual fuel oil

2
Yes.
The refutas will give you the blend ratio.
You know the density of each component and it is a simple calculation to determine the density of the blend because density is an additive property.
If you prefer, download a copy of the Shell program for fuel oil blend calculations, obtain a similar program from Esso, DNV or visit the steamesteem.com web siote for a free download there.
The Shell program is at:
http://www.shell.com/static/marine-en/downloads/products_and_services/marine_fuels/library_shell_bunkercalc_pc.pdf
(the lnk is in the *.pdf file).

JMW
www.ViscoAnalyser.com

RE: Density of blended residual fuel oil

(OP)
Hello everybody:

Thanks to jmw and 25362.

jmw, I already have that document from Shell but, anyway, thanks you.

The question is for this:

Residual fuel oil with density = 1014 kg/m3 at 15º C and a kinematic viscosity of 1000 cSt at 50º C.

Diluent with density = 850 kg/m3 at 15º C and a kinematic viscosity of 3.4 cSt at 50º C.

In order to obtain a viscosity of 600 cSt for the blended product, it is needed to mix 95,1 % mass of residual fuel oil and 4,9 % mass of diluent. So far, everything looks O.K.

But, for the density is it correct to do this?

(4,9%)(850)+(95,1%)(1014)= 1.005,96 kg/m3

Thanks

RE: Density of blended residual fuel oil


If there is no contraction nor expansion (meaning volumes are additive) as a result of mixing, and to be consistent with the units:

1 kg ÷ [(0.049 kg/850 kg/m3)+(0.951 kg/1014 kg/m3)] = 1004.5 kg/m3

RE: Density of blended residual fuel oil

(OP)
Hello everybody:

Thanks for all. Stars for you.

RE: Density of blended residual fuel oil

Just curious but is the cutter viscosity 3.4cst at 50degC or is it at 40degC? as it is more usual to quote the 40degC value for the cutter.
If 3.4cst at 40degC then a 600cst blend would require 4.6% by mass cutter and the resultant density is 1004.5kg/m3 but if it is 3.4cst at 50degC ( a thicker oil) then the blend requires 4.9% cutter and the blend density is 1005.2kg/m3.

(I prefer to use the DNV program Bunker Master 2 or the Esso program, because the Shell program requires you to calculate each property in turn once you know the ratio from the viscosity calculation.... I'm lazy. I used the DNV here.).

JMW
www.ViscoAnalyser.com

RE: Density of blended residual fuel oil

(OP)
Hello everybody:

jmw: the cutter is 4,1 cSt @ 40º C.

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