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)
Distillate fuel grades are ISO-F-DMX, DMA, DMZ, DMB. These fuel grades are referred to as
MDF (Marine Diesel Fuel).
The distillate grades mentioned above can be described as follows:
● DMX: A fuel 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 the 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 as MGO (Marine Gas Oil).
● DMZ: A high quality distillate, generally designated as MGO (Marine Gas Oil). An alternative
fuel grade for engines requiring a higher fuel viscosity than specified for DMA grade fuel.
● 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 as MDO (Marine Diesel Oil).
Table 6-1 MDF specifications
Test method ref.ISO-F-DMBISO-F-DMZISO-F-DMAUnitProperty
2.02.02.0cStViscosity, before injection pumps, min.
1)
242424cStViscosity, before injection pumps, max.
1)
ISO 3104232cStViscosity at 40°C, min.
ISO 31041166cStViscosity at 40°C, max.
ISO 3675 or 12185900890890kg/m³Density at 15°C, max.
ISO 4264354040Cetane index, min.
ISO 8574 or 1459621.51.5% massSulphur, max.
ISO 2719606060°CFlash point, min.
IP 570222mg/kgHydrogen sulfide. max.
2)
ASTM D6640.50.50.5mg KOH/gAcid number, max.
ISO 10307-10.1
3)
——% massTotal sediment by hot filtration, max.
ISO 1220525
4)
2525g/m
3
Oxidation stability, max.
ISO 10370—0.300.30% massCarbon residue: micro method on the 10% volume
distillation residue max.
ISO 103700.30——% massCarbon residue: micro method, max.
ISO 30160-6-6°CPour point (upper) , winter quality, max.
5)
Wärtsilä 46F Product Guide - a19 - 1 December 2017 6-1
6. Fuel Oil SystemWärtsilä 46F Product Guide
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