K Petro company
Diesel

Diesel

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Test items,Meaning of test items
Test items Meaning of test items
Pour point (℃)

The lowest temperature to maintain the flux status when being frozen

Viscosity increases when the temperature rapidly decreases in winter, and the wax content included in the fuel is emitted at the same time. Therefore, it blocks filter causing the fuel to be insufficiently supplied, lowering the spraying function, and badly influencing on the ignitionability and combustion.

Flashing point (℃)

Temperature for instantaneously lighting on and off when approaching the flame to the oil by heating oil products

Criteria for judging the degree of danger in fire when saving, delivering, and using oil products

Coefficient of viscosity (40 ℃, mm2/s)

Related to the spraying feature of fuel. The lower the viscosity, the better the spraying feature is. It is also precisely sprayed accelerating heating and evaporation, reducing the delay of ignition, and hence improving combustion.

For the fuel sprayed by the spraying nozzle to be completely burnt, the efficacy of spraying shall be high. In addition, there is a need to maintain the viscosity in a certain level for this.

Since fuel needs to serve as a role of lubricant in the engine, a certain level of viscosity is required

Distillation characteristics (90% spilled temperature, ℃)

Confirm the boiling point of the ingredients and identify rough components as well as volatility of oil products

Diesel has higher heat energy per volume if there is much of distillate with high critical point, in other words; hydrocarbon. Therefore, it is advantageous in terms of output. However, due to the slow combustion speed, carbon powder can be easily attached to the areas near spraying nozzle.

If there is much of distillate with low critical point, there is less heat energy per volume. However, it has better starting feature but less contamination in the cylinder.

Remaining hydrocarbon in 10% of remaining oil (weight, %)

Remaining carbon is the criterion for judging the combustibiilty. Especially, it is important as a criterion for the quality of heavy oil or diesel in terms of the relationship with carbon occurring in the combustion.

When measuring tiny amount of remaining carbon like diesel, the hard oil shall be evaporated in advance removing up to 90% of spilled oil and measuring the 10% of remaining carbon

Water and precipitate (volume %)

If water is frozen below 0℃, fuel becomes oblique and frozen causing to block the filter and corrode the nozzle and fuel line that deposit blocks spraying device causing the problems on the vehicles.

Sulfur content (mg/kg)

Cause the deposit and corrosion on the combustion system in the organization and air pollution issues by SO2 occurring in the combustion

Ash (weight, %)

Left-over that is not burnt when completely burning the oil product

Metal becomes the oxide when it is burnt causing the abrasion on cylinder by producing deposit on the organization

Cetane value (cetane index)

The higher the cetane value is, the better the starting and driving performance is. However, if it is excessively high, it causes exhaust due to inconsistent combustion while increasing the amount of consumption of fuel

Corrosion of copper plate (100 ℃, 3h)

Indirectly measure with sulfur content or oxidative substances as a cause of corrosion

Filter blocking point (℃)

When temperature rapidly decreases in winter, wax substances produced in the diesel are solidified blocking the filtering paper on the fuel filter and reducing the amount of fuel sent to the engine. Therefore, the initial starting feature of the engine is not good. In extreme case, engine turns off.

Fuel company either adjusts the component or adds the additives to improve frozen starting feature in winter controlling the blocking point of low temperature filter and seamlessly supplying the fuel

Lubrication @60 ℃ (HFRR, abrasion, ㎛)

Indicate the degree of preventing abrasion. If the lubrication is lowered in the fuel, it causes abrasion on the parts of vehicles.

Density @15℃ (kg/㎥)

Density of oil product is used to measure the structure of hydrocarbon and also to calculate the weight and content.

Lubrication @60 ℃ (HFRR, abrasion, ㎛)

Indicate the degree of preventing abrasion. If lubrication is lowered in the fuel, it causes abrasion on parts of the vehicles.

Density @15 ℃ (kg/㎥)

Density of oil product is used to measure the structure of hydrocarbon and also to calculate weight and content.

Polycyclic aromatic content (weight, %)

Related to combustion of engine. The lower the content is, the lower the emission of nitrogen oxide.

Aromatic compound content (weight, %)

Aromatic compound causes benzopyrene that is harmful on human body during combustion

Fatty acid methyl-ester content (volume, %)

Shall combine bio-diesel on the diesel for vehicle for more than 2.5% according to the obligatory proportion of combination from New Generating Energy Act.함

Cetane value (Cetane index)

The higher the cetane is, the better starting feature and performance is. However, if it is excessively high, combustion becomes inconsistent causing the exhaust while increasing the consumption of fuel

Corrosion of copper plate (100 ℃, 3h)

Indirectly measure the sulfur content or oxidized substances as a cause of corrosion

Filter blocking point (℃)

When the temperature rapidly decreases in winter, wax component contained in the diesel is solidified blocking the filtering paper in the fuel filter and reducing the amount of fuel sent to the engine. Therefore, initial starting feature is not good. In extreme case, engine turns off.

Oil refining company either adjusts the components to improve frozen starting feature in winter or adds the additive to control the blocking point of low temperature filter and seamlessly supply fuel.