1. The fuel system Engine HFO MDOmu

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
Heavy Fuel Oil is a residual oil that
can be made more suitable for driving
Diesel engines by adding certain
flammable substances.
HFO
Marine Diesel Oil (MDO) is a
high-grade fuel of low viscosity.
MDO
Modern Diesel engines are run
on Intermediate Fuel Oil (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
Settling tank

5. HFO
In the settling tank water and impurities are separated from the fuel and drained off.
Engine
Fuel pumps
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

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

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

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

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

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

14. Marine Diesel Oil
Engine
Fuel pumps

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

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

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

18. A mixing tank is used for a gradual transition from HFO to DO.
Engine
Fuel pumps
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
Buffer tank
(Circulating tank)
sound

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

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