Specic fuel oil consumption (SFOC)
Specic fuel oil consumption values refer to brake
power, and the following reference conditions:
ISO 3046/2002:
Blower inlet temperature ................................. 25°C
Blower inlet pressure .............................000 mbar
Charge air coolant temperature ..................... 25 °C
Fuel oil lower caloric value ............... 42,700 kJ/kg
(~0,200 kcal/kg)
Although the engine will develop the power speci-
ed up to tropical ambient conditions, specic
fuel oil consumption varies with ambient condi-
tions and fuel oil lower caloric value. For calcula-
tion of these changes, see Chapter 2.
SFOC guarantee
The gures given in this project guide represent
the values obtained when the engine and turbo-
charger are matched with a view to obtaining the
lowest possible SFOC values and in compliance
with the IMO NO
x
emission limitations, i.e. the
socalled ‘fuel economy mode’.
The Specic Fuel Oil Consumption (SFOC) is
guaranteed for one engine load (powerspeed
combination), this being the specied MCR rating.
The guarantee is given with a margin of 5%.
If the ‘NO
x
emission mode’ is applied the SFOC is
somewhat higher than for ‘fuel economy mode’,
as mentioned in section 6.0. An estimation of
the SFOC is stated in the following table.
Please note that the SFOC gures for ‘NO
x
emis-
sion mode’ are not subject to any guarantee.
Lubricating oil data
The cylinder oil consumption gures stated in the
tables are valid under normal conditions.
During runningin periods and under special con-
ditions, feed rates of up to .5 times the stated
values should be used.
The following tables contain data regarding the
power, speed and specic fuel oil consumption of
the engine.
Engine power is specied in kW for each cylinder
number and layout points L
, L
2
, L
3
and L
4
:
Discrepancies between kW and metric horsepow-
er ( BHP = 75 kpm/s = 0.7355 kW) are a conse-
quence of the rounding off of the BHP values.
L
designates nominal maximum continuous rating
(nominal MCR), at 00% engine power and 00%
engine speed.
L
2
, L
3
and L
4
designate layout points at the other
three corners of the layout area, chosen for easy
reference.
Fig. 1.04.01: Layout diagram for engine power and speed
Overload corresponds to 0% of the power at
MCR, and may be permitted for a limited period of
one hour every 2 hours.
The engine power gures given in the tables re-
main valid up to tropical conditions at sea level as
stated in IACS M28 (978), i.e.:
Blower inlet temperature ................................ 45 °C
Blower inlet pressure .............................000 mbar
Seawater temperature .................................... 32 °C
Relative humidity ..............................................60%
178 51 489.0
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