Regulations and care
Heavy fuels
A4.05.07.02
M20-M601C
en / 15.12.1997 BA000170 2/5
Ĺ
CIMAC-Specifications
On the basis of the ISO-Specification, the CIMAC Working Group “Future Fuels” has divided the
fuels according to their physical and chemical data, which are decisive for a reliable engine opera-
tion.
In accordance with ISO, identical character/figure combinations are used for the identification of
quality and viscosity,
e. g. CIMAC-A10 corresponds to ISO-F-RMA 10.
The CIMAC-Specification does not fully agree with the ISO-Specifications.
The most important differences are as follows:
– CIMAC provides fewer density limits for the A10 - D15 classes.
– Introduction of minimum viscosity with CIMAC.
The CIMAC-specification is the basis for the Caterpillar / MaK heavy fuel specification (A4.05.07.05).
BSI-Specification
The BS MA 100 which came into force in 1982 was with drawn in September 1989. Since then the
contents of BS MA 100 conforms with ISO 8217.
The Caterpillar / MaK Heavy Fuel Specification indicates the equivalents of the CIMA-Specification
and the ISOSpecifications.
The most important change is the limitation of:
Density (separability)
Carbon residue (Conradson)(combustibility)
Vanadium (hot corrosion)
Aluminium + Silicium (scuffing by catfines)
Pour Point (pumpability)
Sediments (stability)
A classification limit about the ignition quality could not be specified up to now in default of suitable
test methods.
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