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# 6 Oil Viscosity Cutting vs Flash

# 6 Oil Viscosity Cutting vs Flash

# 6 Oil Viscosity Cutting vs Flash

(OP)
To control our # 6 oil viscosity, we can cut with the following cutterstocks,

crude unit diesel                flash ~ 180 °F
merox kerosene                   flash ~ 160 °F
distillate hydrotreater diesel   flash ~ 180 °F
visbreaker gas oil               flash ~ 190 °F

At times, usually when we're cutting with a lot of kerosene, the #6 oil flash will be < 150 °F.

How can this be, when the individual component flash points are > 150 °F? Are there any guidelines or mixing rules that apply? Or is there some other phenomenon going on here?

Thx Brian

RE: # 6 Oil Viscosity Cutting vs Flash

It is strange, normally the fuel blends' FP you mention are never lower than the lowest FP of any of the components. Assuming you're using the ASTM D93/IP34 tester, contaminations would explain such an abnormal behaviour. I don't know the repeatability or reproducibility levels of these tests, but it would be worthy to have a look at the ASTM books on this subject.

Representative sampling -of the components and the blends- seems to play a role. For example, if the components have a "range" of FP, due to layering of some sort or unsuccesful mixing, or to changes in processing. Low sulphur diesels can go as low as 125oF, and aviation kerosines "minimum" specs call for 100oF.


Keep us posted on any discovery, for us to learn from your experience.

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