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 a fuel can be cooled down enough to meet the
injection viscosity limits stated in the table 6-5.
j) When operating engine in gas mode, the Cetane Index limits specified for pilot
fuel as per table 6-4 have to be fulfilled.
k) There doesn’t exist any minimum sulphur content limit for Wärtsilä
®
DF engines
and also the use of Ultra Low Sulphur Diesel (ULSD) is allowed provided that the
fuel quality fulfils other specified requirements.
l) 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.
m) Alternative test method.
Pilot fuel quality in GAS operation
In order to provide the engine efficiency in GAS operation stated in this document while also
complying to IMO Tier III NO
x
legislation when running in GAS operation, the pilot fuel shall
fulfil the characteristics specified in table 6-3, except that the following additional requirement
is valid for Cetane Index related to ISO 8217:2017(E) fuel categories DMX, DMA, DFA, DMZ,
DFZ, DMB and DFB.
The optimum engine performance is achieved with fuel fulfilling the requirements in table
below. However, normal operation of the engine is fully possible with a fuel according to the
ISO 8217:2017(E) with a possible impact on the engine efficiency. In case of questions regarding
the engine performance please contact Wärtsilä.
Table 6-4 Pilot fuel oils
Test method referenceLimitUnitCharacteristics
ISO 426450-Cetane index, min.
6-4 DBAD209883
Wärtsilä 46DF Product Guide6. Fuel System
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