1. FILTERS Faculty of Maritime Studies Rijeka Marin Kustić

3. Basic partion Tough Fine The finest

4. Filter elements Filter grid Filter mesh

5. Filter materials -paper media -synthetic fiber -quartz sand-carboon sponge

6. Types of filters: 1.Air filters 2.Fuel filters (DO & HFO) 3.Lube oil filters 4.Water filters 5.Hydraulic filters 6.Fine filters (magnetic) -always minimaly two filters per plant because of the redundancy and maintanance

7. Water filter -Fresh water filters need cartridges made of steel grid and with holes bored in it -it requests finer net (0.1-0.5mm) over the holes -Sea water filters are also made of steel tin but with rough net placed over the holes -diameter of the holes is from 1 to 3mm

8. Fuel filter -HFO may contain more sediment, dirt, ash and catalyst particles so it is essential to filtrate the fuel through the 5 micron filter element before it is being conducted to the fuel injection equipment -HFO duplex filter is used to finally filtrate the fuel oil leaving the HFO purifier. After filtration it is stored in service tank. Usually „candle” type filters are used

9. Lube oil filter -simple single filter (simplex) with fine net is used -or duplex (redundancy) -same principle as a water filter -allowed pressure drop for clean filter is 0.2 bar -allowed pressure drop for dirty filter is 0.5 bar top Duplex oil filter

10. Fine filter (magnetic) -3 permanent magnet „sticks” -eliminates all metal particles -cleaned by means of a metal brush -used when metal particles can cause abrasive wear of bearings or fuel injection equipment elements or if the particles reach the inside of the cylindar they can cause wear of the cylinder elements.

11. Air filter -multiple layers for better cleaning -device composed of fibrous materials which removes solid particulates such as dust, mold (plijesan), and bacteria from the air. -air filters are used in applications where air quality is important, notably in building ventilation systems and in the engines.

12. Hydraulic filter -must sustain high pressures 200+ bar

13. Maintenance -localy inspecting the inlet and outlet manometers -following instruction book -buying original spare parts -regular cleaning intervals -be aware of fuel/oil quality NEW OIL + DIRTY FILTER = DIRTY OIL

14. Dirty filters

15. Filter problems -pressure drop -reduced flow through filter - dirty oil is passing through it -to big flow (punctured filter)- dirty oil is passing through it -bad maintenance -poor quality -bad oil or fuel quality

16. Resources http://www.ddservis.hr/filteri.html http://www.machineryspaces.com/fuel-oil- treatment.html http://www.machineryspaces.com/fuel-oil- treatment.html Ozretić, Velimir, Brodski pomoćni strojevi i ure đ aji, Split, ožujak 2004., str. 314-326 Google pics http://www.alfalaval.com/solution- finder/products/pages/default.aspx?type=Pro ductCategory&firstItemID=5cb3e047-c7ab- 4176-a7e9-076f02fd469f