Wartsila ?31DF Series, Product Manual, Page: 87 / 216

Test method(s)
and references
Category ISO-F
Lim-
it
Unit Characteristics
DFB DMB DFZ DMZ DFA DMA DMX
ISO 3016
0 -6 -6 -
Max °C
winter
Pour point
(upper)
f)
6 0 0 - summer
-
c) Clear and bright g)
Appearance
ISO 3733, ASTM
D6304-C m)
0,30
c)
- - - Max % v/v Water
ISO 6245 0,010 0,010 0,010 0,010 Max % m/m Ash
ISO 12156-1
520 d)
520 520 520 Max µm
Lubricity, corr. wear scar
diam.
h)
NOTE
a) 1 mm²/s = 1 cSt.
b) Notwithstanding the limits given, the purchaser shall define the maximum sulphur
content in accordance with relevant statutory limitations.
c) If the sample is not clear and bright, the total sediment by hot filtration and water
tests shall be required.
d)
If the sample is not clear and bright, the Oxidation stability and Lubricity tests
cannot be undertaken and therefore, compliance with this limit cannot be shown.
e ) See ISO 8217:2017(E) standard for details.
f)
Pour point cannot guarantee operability for all ships in all climates. The purchaser
should confirm that the cold flow characteristics (pour point, cloud point, cold filter
clogging point) are suitable for ship’s design and intended voyage.
g) If the sample is dyed and not transparent, see ISO 8217:2017(E) standard for
details related to water analysis limits and test methods.
h) The requirement is applicable to fuels with sulphur content below 500 mg/kg
(0,050 % m/m).
Additional notes not included in the ISO 8217:2017(E) standard:
i) Low min. viscosity of 1,400 mm²/s can prevent the use ISO-F-DMX category
fuels in Wärtsilä
®
engines unless the fuel can be cooled down enough to meet the
distillate fuel injection viscosity limit of Wärtsilä 31DF which is 2,0 - 24 mm
2
/s.
j) There doesn’t exist any minimum sulphur content limit for Wärtsilä 31DF engines
and also the use of Ultra Low Sulphur Diesel (ULSD) is allowed provided that the
fuel quality fulfils other specified requirements.
k) Low flash point (min. 43 °C) can prevent the use ISO-F-DMX category fuels in
Wärtsilä
®
engines in marine applications unless the ship’s fuel system is built
according to special requirements allowing the use or that the fuel supplier is able
to guarantee that flash point of the delivered fuel batch is above 60 °C being a
requirement of SOLAS and classification societies.
l) Alternative test method.
DBAE248994 6-3
6. Fuel Oil System Wärtsilä 31DF Product Guide