Wartsila ?31DF Series, Product Manual

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6.1.2.2 0,10% m/m sulphur fuels for SECA areas
Due to the tightened sulphur emission legislation being valid since 01.01.2015 in the specified
SECA areas many new max. 0,10 % m/m sulphur content fuels have entered the market.
Some of these fuels are not pure distillate fuels, but contain new refinery streams, like
hydrocracker bottoms or can also be blends of distillate and residual fuels. The new 0,10 %
m/m sulphur fuels are also called as Ultra Low Sulphur Fuel Oils (ULSFO) or “hybrid” fuels,
since those can contain properties of both distillate and residual fuels. In the existing ISO
8217:2017(E) standard the fuels are classed as RMA 10, RMB 30 or RMD 80, if not fulling the
DM grade category requirements, though from their properties point of view this is generally
not an optimum approach.
These fuels can be used in the Wärtsilä 31DF engine type in back-up and diesel mode, but
special attention shall be paid to optimum operating conditions. See also Services Instruction
WS02Q312.
RMA 10, RMB 30 and RMD 80 category fuels are accepted only when operating the engine
in back-up or diesel mode. Use of these fuel qualities as a pilot fuel in gas mode is not allowed,
but a fuel quality fulfilling the distillate fuel specification included in chapter
6.1.2.1 has to be
used.
Test method
reference
RMD
80
RMB
30
RMA
10
Unit Characteristics
-
6,0 -
24
6,0 -
24
6,0 -
24
mm
2
/s
a)
Kinematic viscosity bef. inj. pumps
c)
ISO 3104 80,00 30,00 10,00
mm 2 /s
a)
Kinematic viscosity at 50 °C, max.
ISO 3675 or ISO
12185
975,0 960,0 920,0
kg/m
3
Density at 15 °C, max.
ISO 8217, Annex F 860 860 850 - CCAI, max.
e)
ISO 8574 or ISO
14596
0,10 0,10 0,10
%
m/m
Sulphur, max.
b), f)
ISO 2719 60,0 60,0 60,0 °C Flash point, min.
IP 570 2,00 2,00 2,00 mg/kg Hydrogen sulfide, max.
ASTM D664 2,5 2,5 2,5
mg
KOH/g
Acid number, max.
ISO 10307-2 0,10 0,10 0,10
%
m/m
Total sediment existent, max.
ISO 10370 14,00 10,00 2,50
%
m/m
Carbon residue, micro method, max.
ASTM D3279 8,0 6,0 1,5
%
m/m
Asphaltenes, max.
c)
ISO 3016 30 0 0 °C
Pour point (upper), max., winter quality
d)
ISO 3016 30 6 6 °C
Pour point (upper), max., summer quality
d)
ISO 3733 or ASTM
D6304-C c)
0,50 0,50 0,30 % v/v Water max.
ISO 3733 or ASTM
D6304-C
c)
0,30 0,30 0,30 % v/v
Water bef. engine, max.
c)
ISO 6245 or
LP1001 c, h)
0,070 0,070 0,040
%
m/m
Ash, max.
6-4 DBAE248994
Wärtsilä 31DF Product Guide 6. Fuel Oil System