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Diesel Fuel

Up-to-date diesel fuels 

In recent years, as the fleet of diesel vehicles is being renewed and diesel engines are being improved, the diesel fuel quality requirements are changing as well. 

The new diesel engines are more powerful, they use less fuel and the exhaust gas they emit is less toxic – thus the environment is less polluted. That is why diesel engines are now widely used not only in trucks and other vehicles, but also in cars and small commercial automobiles.  
Since January 1, 2000 the European Union has introduced many European standard requirements, where special attention is paid to the ecological indicators of diesel fuel. The allowed sulphur quantity in diesel fuel has especially decreased. At present UAB Mazekiu Nafta Trading House supplies the Lithuanian market only with the diesel fuel which meets and surpasses the quality standards set by the EU – the quantity of sulphur in the traded diesel fuel often does not exceed 10-50 ppm (At present in Lithuania it is allowed to trade in diesel fuel with the quantity of sulphur not exceeding 50 ppm ). 
 
 Diesel fuel types according to climatic periods 
 

Diesel fuel type  Climatic periods 
Grade C summer From May 1 till September 30 
Grade E transitional From March 1 till April 30 and from October 1 till November 30 
Arctic specification second class winter From December 1 till February 28 (29)
 


Arctic specification diesel fuel  

Since there has been no “real” winter for several years in Lithuania, diesel vehicle owners have forgotten about winter problems.  As a matter of fact, “unreal” winters determined the choice of the indicators (classes) laid down in the standards. The reference to one or another climatic class is chosen according to the lowest average temperature. That is why the standards valid in 2003 allowed the marginal filtration temperature up to minus 26 degrees. Statistically this average temperature cannot be reached in Lithuania, although at times it can be even lower. Then some drivers may face problems.    
   
In 2003, due to the unusually cold winter, it was decided to change the requirements by setting as a basis for the climatic requirements the lowest possible temperatures instead of statistical average temperatures. Thus, according to the climatic requirements to diesel fuel, Lithuania was placed in the Arctic climatic zone.
In February 2003 AB Mazeikiu Nafta produced the batch of 2nd class Arctic specification diesel fuel and starting from November 2003 this product was supplied to all the consumers in Lithuania as well as in the other Baltic states.   
According to the valid Lithuanian requirements, the stirring temperature should not be higher than minus 22 °C. The factual indicator of the diesel fuel produced by AB Mazeiku Nafta is minus 22/ minus 25 °C. According to the requirements, the marginal filtering temperature must not exceed minus 32 °C, the factual extent sometimes amounting to minus 40 °C.  
One of the main quality indicators, cetane number, is also much higher than is required (though the norm is not less than 48, the factual amount is 48,5 / 51) . It is due to this indicator that the diesel fuel supplied by UAB Mazeikiu Nafta Trading House surpasses the products made by other producers.  
One of the more important quality indicators, indirectly stating the operational characteristics of the product - viscidity - is also minimal. This determines the smaller deterioration of the jets.
The low average density of the product also causes fewer problems while starting the cold engine. This was achieved by using a fraction which has a boiling temperature limit from 200 to 300 degrees C (°C) as the main component of the arctic specification diesel fuel.  
The quantity of sulphur due to the smaller number of heavy fractions is 7, usually 35 times less than the norm and factually comprises 10 to 50 milligrams of each kilogram of the fuel. For the same reason the quantity of polycyclical aromatic compounds is almost two times smaller – it will considerably decrease the quantity of not burnt hydrocarbons (soot) or smokiness.   
 
Diesel fuel containing Ventus  multifunctional additives 

Scale forms in diesel as well as in gasoline engines. Besides, very important is the even distribution of the fuel, on which the effectiveness of the work of the engine as well as the quantity of the formed scale depend.

Apart from this problem, the ecological requirements becoming stricter and the quantity of sulphur in diesel fuel becoming smaller, it is necessary to ensure the lubrication of the internal engine valves. This function was performed by the organic sulphur compounds. When they are reduced to a certain limit, it is necessary to use additives which improve lubrication. 
While filling the tank with diesel fuel, the foam problem emerges. This extends the filling time and when the tank is filled at the gas stations, the foam can simply “overflow”. The additive is used to reduce foaming. 
      
The diesel fuel additives Ventus were specially produced for the products of AB Mazeikiu Nafta and tested at the BASF AG Fuel Testing and Engine Laboratory in Germany. With regard to the results of the test, the optimal composition and quantity of the additives improving the operational characteristics of the diesel fuel were stated.   

Ventus is a multifunctional additive , which, when used for diesel fuel, improves the following operational characteristics:   
  1. Removes sediments and scale from the jets thus ensuring the even distribution of the fuel. 
  2. The existing anticorrosive additives protect the fuel feeding system from corrosion.  
  3. Improves lubricating properties, which disappear from the fuel after it has been purified from sulphur compounds.  
  4. Reduces the consumption of fuel and harmful exhaust gases.  
  5. Reduces diesel fuel foaming while filling the tank.   
This additive does not in any way interact with other additives which are added in winter in order to improve the properties of the low temperature diesel fuel or with paints which have been used since the subsidies for the diesel fuel were introduced (diesel fuel for agriculture).
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