WÄRTSILÄ 46F Series, Product Manual

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6. Fuel Oil System
6.1 Acceptable fuel characteristics
The fuel specifications are based on the ISO 8217:2017 (E) standard. Observe that a few
additional properties not included in the standard are listed in the tables. For maximum fuel
temperature before the engine, see chapter "Technical Data".
The fuel shall not contain any added substances or chemical waste, which jeopardizes the
safety of installations or adversely affects the performance of the engines or is harmful to
personnel or contributes overall to air pollution.
6.1.1 Marine Diesel Fuel (MDF)
The fuel specification is based on the ISO 8217:2017(E) standard and covers the fuel grades
ISO-F-DMX, DMA, DFA, DMZ, DFZ, DMB and DFB. These fuel grades are referred to as MDF
(Marine Diesel Fuel).
The distillate grades mentioned above can be described as follows:
●
DMX: A fuel quality which is suitable for use at ambient temperatures down to –15 °C
without heating the fuel. Especially in merchant marine applications its use is restricted to
lifeboat engines and certain emergency equipment due to reduced flash point. The low
flash point which is not meeting the SOLAS requirement can also prevent the use in other
marine applications, unless the fuel system is built according to special requirements. Also
the low viscosity (min. 1.4 cSt) can prevent the use in engines unless the fuel can be cooled
down enough to meet the min. injection viscosity limit of the engine.
● DMA: A high quality distillate, generally designated MGO (Marine Gas Oil) in the marine
field.
●
DFA: A similar quality distillate fuel compared to DMA category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
● DMZ: A high quality distillate, generally designated MGO (Marine Gas Oil) in the marine
field. An alternative fuel grade for engines requiring a higher fuel viscosity than specified
for DMA grade fuel.
●
DFZ: A similar quality distillate fuel compared to DMZ category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
● DMB: A general purpose fuel which may contain trace amounts of residual fuel and is
intended for engines not specifically designed to burn residual fuels. It is generally
designated MDO (Marine Diesel Oil) in the marine field.
●
DFB: A similar quality distillate fuel compared to DMB category fuels but a presence of
max. 7,0% v/v of Fatty acid methyl ester (FAME) is allowed.
6.1.1.1 Table Light fuel oils
Table 6-1 Distillate fuel specifications
Test meth-
od(s) and ref-
erences
Category ISO-F
Lim-
it
Unit Characteristics
DFB DMB DFZ DMZ DFA DMA DMX
ISO 3104
11,00 6,000 6,000 5,500 Max
mm
2
/s
a)
Kinematic viscosity at 40 °C
j)
2,000 3,000 2,000
1,400
i)
Min
ISO 3675 or
ISO 12185
900,0 890,0 890,0 - Max kg/m³ Density at 15 °C
DAAB605814 6-1
6. Fuel Oil System Wärtsilä 46F Product Guide