• Heavy Grades

  Filed under News
  Oct 4

  The composition of heavy fuels are mechanical impurities, salt, water, etc. In the operation of the engine on heavy fuel oil it contains heavy particles can cause increased wear of fuel system components, and CPG. Considerable amount of water in the fuel can lead to some breaks in the combustion process and even to stop a diesel engine. Therefore, the use of heavy fuel oil in diesel plants is allowed under special devices for heating and cleaning, as well as special (alkaline) lubricating oils. Before using heavy fuel properly prepared, that is of paramount importance to ensure reliable, uninterrupted and cost of diesel. For normal operation the fuel in reserve, settling and service tanks, before filters, separators and nozzles heated to a temperature that provides the desired viscosity.

  Temperature limit for fuel in the tanks, reported to the atmosphere, should be not less than 15 below the flash point in closed crucible. Viscosity, which provides ease of pumping of fuel, should be 57-120 VU; heating temperature of heavy fuel for a given viscosity is given in Table. 1. In the settling tank and supplies the fuel temperature rises to 50-65 C. Before entering the fuel separator additionally heated to reduce its viscosity (up to 2-6 VU). Ship electrical separator should have special protection from the fuel vapor. The viscosity of separated fuel coming to the nozzles of diesel should be not more than 3,5-4 VU (maximum, permissible). At higher viscosity excessively increases pressure in the atomization that can result in damage to parts of diesel.

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