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Engine Room systems.






4.1. What systems are required for engine operation? Cooling water system, Lubricating oil system, Fuel oil system, Starting air system, Control air system.

4.2. What do you know about Cooling Water system – CWS? Depend of construction two types of CWS are designed: two loop CWS (oldest generation vessels) & three loop CWS (latest generation vessels):

4.2.1. Two loop CWS (oldest generation vessels) contains:

- Sea Water Cooling system (1–st loop) is take the heat from heat exchangers, such as Fresh Water cooler (Jacket Cooling Water cooler), Lubricating Oil cooler, Scavenging Air cooler, Steam Condenser;

- Fresh Water Cooling system (2–nd loop) is take the heat from engines cooling jackets.

4.2.2. Three loop CWS (oldest generation vessels) contains:

- Sea Water Cooling system (1–st loop) is take the heat from heat exchangers, such as Central Fresh Water cooler and Steam Condenser;

- Low Temperature Fresh Water Cooling system (2–nd loop) is take the heat from heat exchangers, such as High Temperature Fresh Water cooler (Jacket Cooling Water cooler), Lubricating Oil cooler, Scavenging Air cooler;

- High Temperature Fresh water Cooling system (3–rd loop) is take the heat from engines cooling jackets.

4.3. What do you know about Lubricating Oil system – LOS? Lubricating Oil system is designed for lubricate the engines moving parts and contains:

4.3.1. For two stroke engines:

- System Oil system is designed for lubricate the engine main bearings, crankpin bearings, crosshead bearings, cooling the piston, piston rod through stuffing box, chain driven gear, for hydraulically activation of exhaust valve. System oil system consist of LO sump tank, main LO pumps, LO coolers, LO filters & LO piping and valves;

- Camshaft LO system is designed for lubricate the engine camshaft and its bearings. Camshaft LO system consist of camshaft LO tank, camshaft LO pumps, camshaft LO coolers, camshaft LO filters & camshaft LO piping and valves;

- Cylinder Oil system is designed for lubricate the engine cylinder liners & piston rings and consist of cylinder oil daily (gravity) tank, cylinder oil filters (each for one lubricator), cylinder oil lubricators, cylinder liner’s non–return valves;

4.3.2. For four stroke engines:

- Lubricating Oil system is designed for lubricate the engine main bearings, crankpin bearings, big–end bearings, cylinder liners and piston rings, cooling the piston, inlet & exhaust valves driven gear, camshaft & its bearings. Lubricating oil system consist of LO sump tank, primer (prelubricating pump) LO pump, main LO pump, LO cooler, LO filters & LO piping and valves;

4.4. What do you know about Fuel Oil system – FOS? Fuel Oil system is designed for booster and supply the fuel oil to the engines and consist of FO service tank, FO heaters, FO circulating pumps, FO supply pumps (booster pumps), FO filters, engine FO injection pumps, engine FO injection valves.

4.5. What do you know about Fuel Oil Bunker system? Fuel oil bunker system is designed for storage, transfer, settling and purification of HFO & DO and consist of HFO (DO) bunker tanks, HFO (DO) transfer pumps, HFO (DO) settling tanks, HFO (DO) purifier’s heaters and HFO (DO) purifiers.

4.6. What do you know about Starting Air system? Starting air system is designed for starting up the Main Engine & Generator Engines and include the starting air compressors, starting air bottles, main starting air valve, starting air valves for each cylinder. Some of the auxiliary engines are started up by air starter.

4.7. What do you know about Control Air system? Control air system is designed for automatic control system pneumatic elements & as service air for maintenance and repair in Engine Room & on deck. Control air system include the control air compressors, control air bottles, control & service air piping, valves and elements.

4.8. Where the steam is generated from and what is used for? The steam is generated in Steam Generator from the Auxiliary Boiler or Exhaust Gas Boiler and used for heating up:

- HFO in the bunker tanks, settling tanks, service tanks through the steam heating coils;

- HFO, DO and LO in the HFO, DO and LO purifier’s heaters;

- HFO in the HFO heaters before engines;

- Cargo oil in the cargo heaters;

- for steam turbines;

- to rotate the Turbo Generator is driven by steam turbine and produce electric power (if applicable);

- to rotate the cargo pumps are driven by steam turbines (if applicable).

4.9. What the Heavy Fuel oil heating up for (Why do we must heating the bunker)? The Heavy Fuel oil is heating up:

- in the bunker tank for possibility of pumping out – minimum required pumping temperature is 40¸ 50OC;

- in the settling tank for settling the water and sediments;

- in the purifier heater for the best quality of the purification;

- in the service tank, before the engines and boilers for reducing the viscosity – fuel oil required viscosity range inlet the engines and boilers is 12¸ 18 cSt (centistokes).

4.10. Where the electric power is generated from and what is used for? The electric power is generated in Diesel Generators Engines, Turbo generator, Shaft Generator and used for electric power supply to electrically driven auxiliary machineries, electronic automation and other technical & domestic (common) electric consumers of overall vessel.


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