5 replies to this topic

I am having a difficult time finding information for the Jet fuel, Kerosene (API 40). (Perry's is not helpful). I need to know the following data, and where to find it, for kerosene API 40 at temperatures 50 F and 220 F:

-heat capacity
-thermal conductivity
-specific gravity
-specific heat
-viscosity
-density

Again, even if I find this data, it is usually a range and I do not know how to interpolate or calculate for the specific number needed. Help!!

Thanks

[Zauberberg]

There are many different grades of kerosene, that's why properties are given as ranged values.
If you need more specific data, it's the best to perform laboratory analyses of a given sample. If this is not possible for you, I do not see what could be another option.

If you are interested in specific commercial grade of kerosene (Jet-A1, for example) do a Google search for standard quality parameters and laboratory methods used for properties measurement and verification. This will give you a good sense for differences of certain values (density, flash point, freeze point, 95% distillation point etc.). You will see there's no much difference of the values you are looking for.

Regards,

[PrayingTigre]

Is API 40 not the specific grade?

[Zauberberg]

It applies for all grades. Quality parameters are given as ranged values, or some of them are specified as minimum or maximums. Freeze point, for example, or D86 distillation end point, or flash point etc. It depends on the purpose and application of specific grade. Anyway, it is not possible (and reasonable) to produce jet fuels with fixed density, or particular distillation point - there's no point for having such request.

There is more info at: http://www.globalsec...ngines-fuel.htm

And excellent engineering document from Chevron website: http://www.chevrongl.../...arks&page=1

[djack77494]

Zauberberg is offering a great deal of useful information, but there may be a "disconnect" in this thread. If I understand Praying Tigre's question correctly, then he/she is confused about the meaning of the term "API 40"; perhaps ckarni has the same misperception. The "40" is a value - its more complete name would be 40 degrees API. Degrees API is a common unit in the Oil & Gas business referring to the density of a (usually) hydrocarbon mixture or product, such as gasoline, kerosene, naphtha, diesel, etc. It is nothing more than the liquid's density-it is NOT a "grade" of kerosene or any other hydrocarbon.

As to ckarni's original posting, you may want to check for references such as Nelson's Petroleum Refining Engineering and even the GPSA Handbook for generalized correlations on properties of petroleum fractions. I'm sure there's much to be found on the internet as well. If you trying to produce a product for a specific customer or need, you might check with your customer to determine his needs and concerns as well.
Doug

[Zauberberg]

Thanks for clarification Doug,

What I think is misunderstanding here, is that there are no fixed property values for any grade of jet fuel (or gasoline, or diesel etc.)

Regardless of the type/grade of petroleum product, quality standards are set in such way to provide range of quality parameters within which the product will have required performance. It is not possible to produce kerosene (or any other petroleum mixture) with fixed quality parameter, in an industrial-scale operation. And there is no need for doing that way.

I am attaching one page from IFP "Crude oil petroleum products" for jet fuel, where it can be seen what properties are required and what are their ranges in commercial kerosenes:

[attachment=850:Jet_Fuel_Specs.pdf]

As far as physical properties are concerned, their values - except for viscosity, maybe - are within very narrow ranges and for equipment design purposes any of these values is good enough. What we don't know here, is the purpose of knowing exact numbers for heat capacity, specific gravity, thermal conductivity etc. I couldn't think of anything of practical (and vital) importance.

Best regards,