V Viscosity in mm
2
/s (cSt) at
50° C
A Normal operating conditions
D Density [in kg/m
3
] at 15° C B The ignition characteristics
can be poor and require
adapting the engine or the
operating conditions.
CCAI Calculated Carbon Aroma-
ticity Index
C Problems identified may lead
to engine damage, even
after a short period of opera-
tion.
1 Engine type 2 The CCAI is obtained from
the straight line through the
density and viscosity of the
heavy fuel oils.
The CCAI can be calculated using the following formula:
CCAI = D - 141 log log (V+0.85) - 81
Figure 2: Nomogram for determining the CCAI and assigning the CCAI ranges to
engine types
The engine should be operated at the coolant temperatures prescribed in the
operating handbook for the relevant load. If the temperature of the compo-
nents that are exposed to acidic combustion products is below the acid dew
point, acid corrosion can no longer be effectively prevented, even if alkaline
lube oil is used.
The BN values specified in 010.005 Engine - Operating instructions
010.000.023-11 are sufficient, providing the quality of lubricating oil and the
engine's cooling system satisfy the requirements.
Sulphuric acid corrosion
2017-07-11 - de
Specification of heavy fuel oil (HFO) D010.000.023-05-0001
General
MAN Diesel & Turbo
010.000.023-05
D010.000.023-05-0001 EN 11 (13)
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