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Fuel Supply Cleaning

Cleaning of fuel on board is carried out by cleaning the fuel separator filter and sedimentation. Defends fuel settling tanks. The process of sedimentation is deposited on the bottom of the container under the influence gravitational forces of mechanical impurities and water. At the same time, with mechanical impurities in the sludge is partially fall and asfaltosmolistye connection. Rapidity of the deposition of various impurities depends on their weight, size and shape, as well as the viscosity of the fuel.

The greater the difference in specific weights of fuel and impurities, and less fuel viscosity, the higher deposition rate. Therefore the process of settling of diesel fuel, which has in comparison with Heavy fuel less dense proceeds more rapidly. To reduce the viscosity of heavy fuel oil (fuel oil) in the slop tanks are usually heated to 60-70 C with a steam heating elements with thermostats, automatically maintains desired temperature. Filtered marine fuel, based on the separation of polluting its impurities due to the difference sizes of migratory cells and the slits filter and filter out particles. Fuel is filtered out in stages en route from the tanks to supply fuel injection pump engines. In toplivoperekachivayuschih and adoptive pumps ship cages placed coarse filters. Ship separator cleans the fuel from water and small particles.

After the fuel separator, it enters the supply tanks. From there goes to the engines. Before the fuel pump filters are usually applied with a finer mesh or slotted. Before The engine is installed fine filters. Coarse filters, the main purpose is to detain large mechanical particles are mesh with filter elements made of metal grids and slotted with the filter elements drawn from separate plates (disks). In one case equipped with two filter elements, one of which can be cleaned while the other will work. The pressure difference before and after the filter typically 0.2 kg / cm 2, increasing the pressure drop of more than 0.4 kg / cm 2 indicates contamination, and the lack of difference – the failure filter (breaking the grid). Filtering materials of fine filters are special paper, felt, felt, porous bronze, ceramics, etc. In contrast to the coarse filters to filter the ability to wash is not fully recovered, so these elements will be replaced periodically. In recent time the work is automated pre-filter, cleaning is carried out by washing the reverse flow of fuel, which then, together with pollution down to the mud tank. For uninterrupted reliable operation of the fuel system sizes remaining in the fuel after mechanical filtration, the particles must be smaller than the gap in high-precision pairs of pumps and nozzles, and therefore should not exceed 3-5 mu.