Wartsila ?31DF Series Product Manual page 88

6. Fuel Oil System
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
used.
Kinematic viscosity bef. inj. pumps
Kinematic viscosity at 50 °C, max.
Density at 15 °C, max.
CCAI, max.
Sulphur, max.
Flash point, min.
Hydrogen sulfide, max.
Acid number, max.
Total sediment existent, max.
Carbon residue, micro method, max.
Asphaltenes, max.
Pour point (upper), max., winter quality
d)
Pour point (upper), max., summer quality
d)
Water max.
Water bef. engine, max.
Ash, max.
6-4
Characteristics
c)
e)
b), f)
c)
c)
RMA RMB RMD
Unit
10 30
2
mm /s
6,0 - 6,0 -
a) 24 24
2
mm /s
10,00 30,00 80,00
a)
3
kg/m 920,0 960,0 975,0
- 850 860
%
0,10 0,10
m/m
°C 60,0 60,0
mg/kg 2,00 2,00
mg
2,5 2,5
KOH/g
%
0,10 0,10
m/m
%
2,50 10,00 14,00
m/m
%
1,5 6,0
m/m
°C 0 0
°C 6 6
% v/v 0,30 0,50
% v/v 0,30 0,30
%
0,040 0,070 0,070
m/m
Wärtsilä 31DF Product Guide
6.1.2.1 has to be
Test method
80 reference
6,0 -
-
24
ISO 3104
ISO 3675 or ISO
12185
860 ISO 8217, Annex F
ISO 8574 or ISO
0,10
14596
60,0 ISO 2719
2,00 IP 570
2,5 ASTM D664
0,10 ISO 10307-2
ISO 10370
8,0 ASTM D3279
30 ISO 3016
30 ISO 3016
ISO 3733 or ASTM
0,50
c)
D6304-C
ISO 3733 or ASTM
0,30
c)
D6304-C
ISO 6245 or
c, h)
LP1001
DBAE248994