Wartsila ?31DF Series Product Manual page 86

6. Fuel Oil System
● 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.
For maximum fuel temperature before the engine, see the Installation Manual.
Table 6-2
Characteristics
Kinematic viscosity at 40
i)
°C
Density at 15 °C
Cetane index
Sulphur
Flash point
Hydrogen sulfide
Acid number
Total sediment by hot fil-
tration
Oxidation stability
Fatty acid methyl ester
(FAME)
Carbon residue – Micro
method
On 10% distillation
residue
Carbon residue – Micro
method
Cloud point
Cold filter
plugging point
f)
6-2
Light fuel oils
Unit
2 a)
mm /s
kg/m³
b, j)
% m/m
°C
mg/kg
mg
KOH/g
% m/m
g/m³
% v/v
e)
% m/m
% m/m
winter
f)
°C
summer
winter
°C
summer
Category ISO-F
Lim-
it
DMX D M A DFA
Max 5,500 6,000
1,400 i)
Min 2,000
Max - 890,0
Min 45 40
Max 1,00 1,00
k)
43,0
Min 60,0
Max 2,00 2,00
Max 0,5 0,5
Max - -
Max 25 25
Max - - 7,0
Max 0,30 0,30
Max - -
-16 Report
Max
-16 -
- Report
Max
- -
Wärtsilä 31DF Product Guide
Test method(s)
and references
D M Z DFZ D M B DFB
6,000 11,00
3,000 2,000
ISO 3675 or ISO
890,0 900,0
40 35
ISO 8754 or ISO
1,00 1,50 14596, ASTM
60,0 60,0
2,00 2,00
0,5 0,5 ASTM D664
c)
0,10
- ISO 10307-1
25 d)
25 ISO 12205
ASTM D7963 or IP
- 7,0 - 7,0
0,30 - ISO 10370
- 0,30 ISO 10370
Report -
- -
Report -
IP 309 or IP 612
- -
DBAE248994
ISO 3104
12185
ISO 4264
D4294
ISO 2719
IP 570
579
ISO 3015