M00020427
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ISO DIS 6246 2016 Edition, March 17, 2016 PETROLEUM PRODUCTS - GUM CONTENT OF LIGHT AND MIDDLE DISTILLATE FUELS - JET EVAPORATION METHOD
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Availability date: 07/14/2021
Description / Abstract:
This International Standard specifies a method for the
determination of the existent gum content of aviation fuels, and
the gum content of motor gasolines or other volatile distillates.
It includes the determination of products containing alcohol (up to
85 % in volume) and ether type oxygenates and deposit control
additives.
For non-aviation fuels, a procedure for the determination of the
heptane-insoluble portion of the residue is also described.
CAUTION-This method is not intended for the testing of
gasoline components, particularly those with a high percentage of
low-boiling unsaturated compounds, as they may cause explosions
during evaporation.
NOTE The true significance of this test method for determining
gum in motor gasoline is not firmly established. It has been proven
that high gum content can cause induction-system deposits and
sticking of intake valves, and in most instances it can be assumed
that low gum content will ensure absence of induction-system
difficulties. The user should, however, realize that the test is
not of itself correlative to induction-system deposits. The primary
purpose of the test, as applied to motor gasoline, is the
measurement of the oxidation products formed in the sample prior to
or during the comparatively mild conditions of the test procedure.
Since many motor gasolines are purposely blended with non-volatile
oils or additives, the heptane extraction step is necessary to
remove these from the evaporation residue so that the deleterious
material, gum, may be determined. With respect to aviation turbine
fuels, large quantities of gum are indicative of contamination of
fuel by higher boiling oils or particulate matter and generally
reflect poor handling practices in distribution downstream of the
refinery.