1. The fuel system
Fuel pumps
Engine mu

2. Types of fuels Diesel engines consume Heavy Fuel Oil (HFO),
Marine Diesel oil (MDO) or Intermediate Fuel Oil (IFO).
Engine
Fuel pumps S

3. Types of fuels HFO MDO IFO
HFO is a residual oil that is made
suitable for driving Diesel engines by
adding certain flammable substances.
HFO
MDO is a high-grade fuel of
low viscosity that is used when the vessel
is manoeuvring.
MDO
Modern Diesel engines are run
on IFO, a fuel whose grade lies
between that of HFO and MDO.
IFO

4. HFO From the Heavy Fuel Oil bunkertank
the preheated fuel is led to the settling tank.
Engine
Fuel pumps
HFO
MDO
Settling tank

5. HFO
In the settling tank water and impurities are separated from the fuel and drained off.
Engine
Fuel pumps
HFO
MDO
Settling tank
Drain-valve s

6. HFO
From the settling tank the fuel is led through a heater to preheat the fuel.
Engine
Fuel pumps
HFO
MDO

7. HFO
From the heater the fuel is led through a separator (purifier / clarifier) to purify the fuel.
Engine
Fuel pumps
HFO
MDO

8. HFO From the separator the fuel enters the daily service tank for HFO.
Engine
Fuel pumps
HFO
MDO
sound

9. HFO
There are two daily service tanks, so that one tank may be used while the other is being filled.
Engine
Fuel pumps
HFO
MDO
Daily service tank
Daily service tank
sound

10. HFO
From the daily service tank the fuel is pumped to a heater by the low pressure fuel pump (or “booster pump”).
Engine
Fuel pumps
HFO
MDO s

11. HFO From the heater the HFO is passed through a viscosity regulator .
Engine
Fuel pumps
HFO
MDO

12. HFO
From the viscosity regulator the fuel is passed through a fuel strainer , which filters the fuel.
Engine
Fuel pumps
HFO
MDO

13. HFO
From the fuel strainer the oil is led to the fuel pumps in the engine.
Engine
Fuel pumps
HFO
MDO
sound

14. MDO
Diesel oil is used for manoeuvring and is stored in the MDO bunkertank.
Engine
Fuel pumps
HFO
MDO

15. MDO After the DO has been pumped up from
the bunkertank, the fuel passes through
a purifier .
Engine
Fuel pumps
HFO
MDO

16. From the purifier the DO enters the
MDO
From the purifier the DO enters the
DO storage tank.
Engine
Fuel pumps
HFO
MDO s

17. MDO
From the DO service tank the fuel is led to the high-pressure fuel pumps in the engine.
Engine
Fuel pumps
HFO
MDO s

18. A mixing tank is used for a gradual transition from HFO to DO.
Engine
Fuel pumps
HFO
MDO
sound
Mixing tank

19. The mixing tank, or “buffer tank”, can hold
a quantity of fuel which will be circulated
and led to the engine.
Engine
Fuel pumps
HFO
MDO
Buffer tank
(Circulating tank)
sound

20. The hot fuel fumes can escape through the air vent in the mixing tank.
Engine
Fuel pumps
HFO
MDO s
Air vent

21. Indicate whether the assertion is
The fuel system
Test 2:
Indicate whether the assertion is or
Indicate in the textbox
why you think the assertion
is wrong.
or in the IMLP-coursebook

22. Types of fuels HFO MDO IFO right or wrong
HFO is a residual oil that is made suitable for driving Diesel engines by removing certain flammable substances.
HFO
…..because:
MDO is a low-grade fuel of high viscosity that
is used when the vessel is manoeuvring.
MDO
…..because:
Modern Diesel engines are run on IFO, a fuel whose grade lies between that of HFO and MDO.
IFO 1
right or wrong

23. From the Heavy Fuel Oil bunkertank the fuel is led to the settling tank.
Engine
Fuel pumps
HFO
MDO
Settling
tank 2
right or wrong

24. …..because:
In the settling tank the fuel is drained off after it has been separated from water and impurities.
Engine
Fuel pumps
HFO
MDO
Settling
tank 3
right or wrong

25. …..because:
From the settling tank the fuel is first led through a purifier and then through a separator.
Engine
Fuel pumps
HFO
MDO
Settling
tank 4
right or wrong

26. right or wrong 5 From the separator the fuel enters the
daily service tank.
Engine
Fuel pumps
HFO
MDO
Settling
tank 5
right or wrong

27. right or wrong 6 There are two daily service tanks:
…..because:
There are two daily service tanks:
one to preheat the fuel, the other to purify the fuel.
Engine
Fuel pumps
HFO
MDO
Settling
tank 6
right or wrong

28. From the daily service tank the fuel is pumped to a heater by the booster pump.
Engine
Fuel pumps
HFO
MDO
Settling
tank 7
right or wrong

29. …..because:
From the heater the HFO is passed through a separator
Engine
Fuel pumps
HFO
MDO
Settling
tank 8
right or wrong

30. right or wrong 9 A fuel strainer preheats and filters the fuel.
…..because:
A fuel strainer preheats and filters the fuel.
Engine
Fuel pumps
HFO
MDO
Settling
tank 9
right or wrong

31. right or wrong 10 From the fuel strainer the oil is led to the
…..because:
From the fuel strainer the oil is led to the
low pressure fuel pumps in the engine.
Engine
Fuel pumps
HFO
MDO
Settling
tank 10
right or wrong

32. …..because:
Diesel oil is used for manoeuvring and is stored in three daily service tanks.
Engine
Fuel pumps
HFO
MDO
Settling
tank 11
right or wrong

33. After the DO has been pumped up from the bunkertank, it is passed through a purifier.
Engine
Fuel pumps
HFO
MDO
Settling
tank 12
right or wrong

34. right or wrong 13 From the purifier the DO enters the settling tank.
…..because:
From the purifier the DO enters the settling tank.
Engine
Fuel pumps
HFO
MDO
Settling
tank 13
right or wrong

35. …..because:
From the DO service tank the fuel is led through a separator, heater, viscosity controller and strainer to the fuel pumps in the engine.
Engine
Fuel pumps
HFO
MDO
Settling
tank 14
right or wrong

36. …..because:
A mixing tank is used to drain off water and impurities from the fuel.
Engine
Fuel pumps
HFO
MDO
Settling
tank
Mixing
tank
right or wrong 15

37. right or wrong 16 The hot fuel fumes can escape through the
…..because:
The hot fuel fumes can escape through the
air vent into the mixing tank.
Engine
Fuel pumps
HFO
MDO
Settling
tank
Mixing
tank 16
sound
right or wrong

38. C P.C. van Kluijven
SHIPPING AND TRANSPORT COLLEGE ROTTERDAM