Modern Diesel engines are run on
IFO, a fuel whose grade lies
between that of HFO and MDO.

HFO is a residual oil that is made
suitable for driving Diesel engines
by removing certain flammable
substances.

MDO is a low-grade fuel of high viscosity that
is used when the vessel is manoeuvring.

…..because:

…..because:

1

From the Heavy Fuel Oil bunkertank
the fuel is led to the settling tank.

2

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

In the settling tank the fuel is
drained off after it has been
separated from water and impurities.

3

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the settling tank the fuel is first
led through a purifier and then
through a separator.

4

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the separator the fuel
enters the
daily service tank.

5

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

There are two daily service tanks:
one to preheat the fuel, the other to
purify the fuel.

6

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the daily service tank the fuel is
pumped to a heater by the booster
pump.

7

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the heater the HFO is passed
through a separator .

8

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

A fuel strainer preheats and
filters the fuel.

9

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the fuel strainer the oil is led
to the
low pressure fuel pumps in the
engine.

10

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

Diesel oil is used for manoeuvring
and is stored in three daily service
tanks.

11

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

After the DO has been pumped up
from the bunkertank, it is passed
through a purifier.

12

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

From the purifier the DO enters the
settling tank.

13

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

14

From the DO service tank the fuel is
led through a separator, heater,
viscosity controller and strainer to
the fuel pumps in the engine.

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

A mixing tank is used to drain off
water and impurities from the fuel.

15

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

Mixin
g
tank

The hot fuel fumes can escape
through the
air vent into the mixing tank.

sound

16

…..because:

Engine

Fuel pumps

HFO

HFO

MDO

Settling
tank

Mixin
g
tank

C P.C. van Kluijven

SHIPPING AND TRANSPORT COLLEGE ROTTERDAM