cording 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 6.2 MDF specifications
Test method ref.
ISO-F-DMB
ISO-F-DMZ
ISO-F-DMA
Unit
Property
2.0
2.0
2.0
cSt
Viscosity before pilot fuel pump, min.
1)
11.0
11.0
11.0
cSt
Viscosity, before pilot fuel pump, max.
1)
2.0
2.0
2.0
cSt
Viscosity, before main injection pumps, min.
1)
24.0
24.0
24.0
cSt
Viscosity, before main fuel injection pumps,
max.
1)
2
3
2
cSt
Viscosity at 40°C, min.
ISO 3104
11
6
6
cSt
Viscosity at 40°C, max.
ISO 3675 or
12185
900
890
890
kg/m³
Density at 15°C, max.
ISO 4264
35
40
40
Cetane index, min.
ISO 8574 or
14596
2
1.5
1.5
% mass
Sulphur, max.
ISO 2719
60
60
60
°C
Flash point, min.
IP 570
2
2
2
mg/kg
Hydrogen sulfide. max.
2)
ASTM D664
0.5
0.5
0.5
mg KOH/g
Acid number, max.
ISO 10307-1
0.1
3)
—
—
% mass
Total sediment by hot filtration, max.
ISO 12205
25
4)
25
25
g/m
3
Oxidation stability, max.
ISO 10370
—
0.30
0.30
% mass
Carbon residue: micro method on the 10%
volume distillation residue max.
ISO 10370
0.30
—
—
% mass
Carbon residue: micro method, max.
ISO 3016
0
-6
-6
°C
Pour point (upper) , winter quality, max.
5)
ISO 3016
6
0
0
°C
Pour point (upper) , summer quality, max.
5)
3) 4) 7)
Clear and bright
6)
—
Appearance
ISO 3733
0.3
3)
—
—
% volume
Water, max.
ISO 6245
0.01
0.01
0.01
% mass
Ash, max.
ISO 12156-1
520
7)
520
520
µm
Lubricity, corrected wear scar diameter (wsd
1.4) at 60°C , max.
8)
Remarks:
Additional properties specified by Wärtsilä, which are not included in the ISO specification.
1)
The implementation date for compliance with the limit shall be 1 July 2012. Until that the specified value is given
for guidance.
2)
If the sample is not clear and bright, the total sediment by hot filtration and water tests shall be required.
3)
If the sample is not clear and bright, the test cannot be undertaken and hence the oxidation stability limit shall
not apply.
4)
It shall be ensured that the pour point is suitable for the equipment on board, especially if the ship operates in
cold climates.
5)
If the sample is dyed and not transparent, then the water limit and test method ISO 12937 shall apply.
6)
If the sample is not clear and bright, the test cannot be undertaken and hence the lubricity limit shall not apply.
7)
Product Guide Wärtsilä 34DF - 3/2012
37
Product Guide
6. Fuel System
