If the engines are to be operated on MDF only, heating of the fuel is normally not necessary.
In such case it is sufficient to install the equipment listed below. Some of the equipment listed
below is also to be installed in the MDF part of a HFO fuel oil system.
6.3.4.1
Circulation pump, MDF (1P03)
The circulation pump maintains the pressure at the injection pumps and circulates the fuel in
the system. It is recommended to use a screw pump as circulation pump. A suction strainer
with a fineness of 0.5 mm should be installed before each pump. There must be a positive
static pressure of about 30 kPa on the suction side of the pump.
Design data:
5 x the total consumption of the connected engines
Capacity
1.6 MPa (16 bar)
Design pressure
1.0 MPa (10 bar)
Max. total pressure (safety valve)
see chapter "Technical Data"
Nominal pressure
50°C
Design temperature
90 cSt
Viscosity for dimensioning of electric
motor
6.3.4.2
Stand-by pump, MDF (1P08)
The stand-by pump is required in case of a single main engine equipped with an engine driven
pump. It is recommended to use a screw pump as stand-by pump. The pump should be
placed so that a positive static pressure of about 30 kPa is obtained on the suction side of
the pump.
Design data:
5 x the total consumption of the connected engine
Capacity
1.6 MPa (16 bar)
Design pressure
1.2 MPa (12 bar)
Max. total pressure (safety valve)
50°C
Design temperature
90 cSt
Viscosity for dimensioning of electric
motor
6.3.4.3
Flow meter, MDF (1I03)
If the return fuel from the engine is conducted to a return fuel tank instead of the day tank,
one consumption meter is sufficient for monitoring of the fuel consumption, provided that the
meter is installed in the feed line from the day tank (before the return fuel tank). A fuel oil cooler
is usually required with a return fuel tank.
The total resistance of the flow meter and the suction strainer must be small enough to ensure
a positive static pressure of about 30 kPa on the suction side of the circulation pump.
There should be a by-pass line around the consumption meter, which opens automatically in
case of excessive pressure drop.
6.3.4.4
Fine filter, MDF (1F05)
The fuel oil fine filter is a full flow duplex type filter with steel net. This filter must be installed
as near the engine as possible.
6-18
Wärtsilä 32 Product Guide - a21 - 7 September 2016
Wärtsilä 32 Product Guide
6. Fuel Oil System
Summary of Contents for WARTSILA32
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