Wartsila ?31DF Series Product Manual page 90

6. Fuel Oil System
6.1.2.3 Heavy fuel oil operation (residual)
The fuel specification "HFO 2" is based on the ISO 8217:2017(E) standard and covers the fuel
categories ISO-F-RMA 10 – RMK 700. Additionally, the engine manufacturer has specified
the fuel specification "HFO 1". This tighter specification is an alternative and by using a fuel
fulfilling this specification, longer overhaul intervals of specific engine components are
guaranteed (See the Engine Manual of a specific engine type).
HFO is accepted only for back-up fuel system. Use of HFO as pilot fuel is not allowed, but a
fuel quality fulfilling the MDF specification included in section
has to be used.
Table 6-3
Kinematic viscosity before main injection
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 aged, max.
Carbon residue, micro method, max.
Asphaltenes, max.
Pour point (upper), max.
Water, max.
Water before engine, max.
Ash, max.
Vanadium, max.
Sodium, max.
Sodium before engine, max.
Aluminium + Silicon, max.
Aluminium + Silicon before engine, max.
d)
6-6
Heavy fuel oils
Characteristics
d)
f)
c, g)
d)
e)
d)
g)
g)
d, g)
Light fuel oil operation (distillate)
Limit
Unit
HFO 1 HFO 2
2 b)
mm /s 20 ± 4 20 ± 4
mm 2 /s b)
700,0
991,0 / 991,0 /
kg/m 3
a)
1010,0 1010,0
- 850
Statutory require-
% m/m ments, but max.
4,50 % m/m
°C 60,0
mg/kg 2,00
mg KOH/g 2,5
% m/m 0,10
% m/m 15,00
% m/m 8,0
°C 30
% V/V 0,50
% V/V 0,30
% m/m 0,050
mg/kg 100
mg/kg 50
mg/kg 30
mg/kg 30
mg/kg 15
Wärtsilä 31DF Product Guide
Limit
Test method reference
-
700,0 ISO 3104
ISO 3675 or ISO 12185
a)
ISO 8217
870
, Annex F
ISO 8754 or ISO 14596
60,0 ISO 2719
2,00 IP 570
2,5 ASTM D664
0,10 ISO 10307-2
20,00 ISO 10370
14,0 ASTM D3279
30 ISO 3016
ISO 3733 or ASTM
0,50
D6304-C d)
ISO 3733 or ASTM
0,30
D6304-C d)
0,150 ISO 6245 or LP1001
IP 501, IP 470 or ISO
450
14597
100 IP 501 or IP 470
30 IP 501 or IP 470
IP 501, IP 470 or ISO
60
10478
IP 501, IP 470 or ISO
15
10478
DBAE248994
d, i)