12.4.5
Data about distillate fuel specifications
The paragraphs that follow give more data about the specifications for distillate fuels.
12.4.5.1
Viscosity
For distillate fuel a minimum viscosity of 2.0 mm
2
/s (cSt) at the engine inlet is necessary. A lower
viscosity can cause too much leakage in the fuel system.
Operators must be careful during the change-over procedure from distillate to residual fuel and
back to make sure of problem free operation. Refer to the related fuel change-over procedures in
the Operation Manual.
In some conditions, it is possible that you cannot get the minimum viscosity of 2.0 mm
2
/s (cSt) at
the engine inlet. In such conditions, a fuel cooling system is necessary to make sure that the inlet
to the engine has the minimum viscosity.
12.4.5.2
Lubricity
ISO 8217:2017 specifies a maximum lubricity wear scar diameter (WSD) of 520
μ
m to make sure
that the fuel has sufficient lubricity. This prevents quick wear of the fuel system components.
12.4.5.3
Density
The distillate density is related to the composition of the fuel. A high density indicates a high
aromatic quantity.
12.4.5.4
Cetane index
The ignition and combustion properties of a distillate fuel in a diesel engine is related to the specific
engine design, load profile and fuel properties. The Cetane Index is a calculated value of the
ignition quality of the fuel related to the distillation and density. The density and the temperature
when 10%, 50% and 90% of the fuel is distilled, gives the Cetane Index. This has no effect on the
fuel combustion properties.
12.4.5.5
Sulphur
Sulphur limits are specified in ISO 8217:2017 for distillate fuels, but statutory specifications must
be obeyed. The alkalinity (BN) of the cylinder oil must be selected in relation to the sulphur content
of the fuel in use.
Indications for the selection of the BN of the cylinder oil in relation to the sulphur content of the
fuel are found in the related specifications.
12.4.5.6
Acid number
Fuels with high acid numbers can cause damage to fuel injection systems. Most fuels have a low
acid number, which is not dangerous, but an acid number above 2.5 mg KOH/g can cause damage.
X92-B
AA00-0000-00AAA-030A-A
Operation Manual
Diesel engine fuels
Winterthur Gas & Diesel Ltd.
- 451 -
Issue 002 2021-11
Содержание X92-B
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