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and durability of the filtration system, fuel equipment and
cylinder-propeller group; formation during combustion of non-
toxic substances.
These requirements are fulfilled only if the fuel has
certain physical, chemical and operational properties, which
can be divided into two groups: those that influence the
operation of the engine power system (kinematic viscosity, low
temperature properties, content of mechanical impurities and
water ) and those that affect the evaporation and combustion of
fuel (fractional composition, temperature and the period of
delay of self-ignition, the ability to form the formation of
carbon, corrosion).
Depending on the conditions of use of fuel for high-
speed diesel engines two grades are issued: S - summer, W-
winter (according to National Standards of Ukraine 3868-99).
Summer fuel is used for environmental temperature minus 5 С
and above, winter - minus 15 С and above. By the content of
sulfur, diesel fuels are divided into two types: І- mass fraction
of sulfur not more than 0,05 %; ІІ- mass fraction of sulfur no
more 0,1 %.
According to National Standards of Ukraine 4840-2007
by the content of sulfur, diesel fuels are divided into two types:
І – the sulfur content is not more than 10 mg / kg; ІІ – sulfur
content not more than 50 mg / kg.
Depending on the conditions of use, the following
grades and grades of diesel fuel are established. For operation
in temperate climates: mark A is the marginal filtering
temperature (t f. m..) not higher 5 С; mark В – t f. m. ≤ 0 С; mark
С – t f. m. ≤ -5 С; mark D – t f. m . ≤ -10 С; mark Е – t f. m. ≤ -15
С; mark F – t f. m. ≤ -20 С. For usage in conditions of the
Arctic climate: class 0 – t f. m. ≤ -20 С; class 1 – t f. m. ≤ -26 С.

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