Tab 12-1 Specifications for HFO
Parameter Bunker limit At engine inlet Unit Test method
Kinematic viscosity
at 50°C
Maximum 700
13 to 17
1
(not related
to temperature)
mm
2
/s [cSt]
2
ISO 3104
Density at 15°C Maximum 1010
3
Maximum 1010 kg/m
3
ISO 3675/12185
CCAI Maximum 870 Maximum 870 - Calculated
Sulphur
4
Statutory specifica-
tions
Maximum 3.5 mass % ISO 8754/14596
Flash point Minimum 60 Minimum 60 °C ISO 2719
Hydrogen sulphide
5
Maximum 2.0 Maximum 2.0 mg/kg [ppm] IP 570
Acid number Maximum 2.5 Maximum 2.5 mg KOH/g ASTM D 664
Total sediment,
aged
Maximum 0.1 Maximum 0.1 mass % ISO 10307-2
Carbon residue: mi-
cro method
Maximum 20 Maximum 20 mass % ISO 10370
Pour point (upper)
6
Maximum 30 Maximum 30 °C ISO 3016
Water Maximum 0.5 Maximum 0.2 volume % ISO 3733
Ash Maximum 0.15 Maximum 0.15 mass % ISO 6245
Vanadium Maximum 450 Maximum 450 mg/kg [ppm] ISO 14597/IP501/
IP470
Sodium Maximum 100 Maximum 30 mg/kg [ppm] IP501/IP470
Aluminum plus Sili-
con
Maximum 60 Maximum 15 mg/kg [ppm] ISO 10478/IP501/
IP470
Used lubricating oils
(ULO) must not be
present: Calcium
(Ca) and zinc (Zn)
ULO shows if: Ca>30
and Zn>15 or Ca>30
and P>15
Do no use if: Ca>30
and Zn>15 or Ca>30
and P>15
mg/kg [ppm] IP501 or IP470 or
IP500
1 For Generation X, X-DF and RT-flex engines, the fuel viscosity at the engine inlet must be
in the range between 10 mm
2
/s and 20 mm
2
/s, but WinGD recommends a fuel viscosity at
the engine inlet in the range between 13 mm
2
/s and 17 mm
2
/s. The maximum permitted
temperature is 150°C.
2 1 mm
2
/s = 1 cSt (Centistoke)
3 The maximum density limit is 991 kg/m
3
if the fuel treatment plant cannot remove water from
high-density fuel.
4 In ISO 8217:2017 sulphur limits are not given for HFO. Sulphur limits are related to statutory
specifications.
5 The hydrogen sulphide limit is applicable from 1st July 2012.
6 Purchasers must make sure that the equipment on board can always keep the fuel at a
temperature above the pour point, specially in cold climates.
It is very important that the fuel is fit for purpose in the related engine application.
X92-B
AA00-0000-00AAA-030A-A
Operation Manual Diesel engine fuels
Winterthur Gas & Diesel Ltd.
- 444 - Issue 002 2021-11
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