,
Specific Fuel Oil Consumption (SFOC)
The figures given in this folder represent the val-
ues obtained when the engine and turbocharger
are matched with a view to obtaining the lowest
possible SFOC values while also fulfilling the IMO
NOX Tier II emission limitations.
Stricter emission limits can be met on request, us-
ing proven technologies.
The SFOC figures are given in g/kWh with a toler-
ance of 5% and are based on the use of fuel with
a lower calorific value of 42,700 kJ/kg (~10,200
kcal/
kg) at ISO conditions:
Ambient air pressure ............................. 1,000 mbar
Ambient air temperature ................................ 25 °C
Cooling water temperature ............................ 25 °C
Specific fuel oil consumption varies with ambient
conditions and fuel oil lower calorific value. For
calculation of these changes, see Chapter 2.
Gas consumption
The energy consumption (heat rate) for the GI
engine is lower when running on gas in dual fuel
mode (heat rate in kJ/kWh) compared to fuel only
mode.
When a given amount of oil is known in g/kWh,
and after deducting the pilot fuel oil the additional
gas consumption can be found by converting the
energy supplied as gas into cubic metre per hour
according to the LCV of the gas.
In the following sections, the energy consumption
is calculated as related equivalent fuel consump-
tion, i.e. with all our usual figures.
Example:
Related equivalent SFOC og gas .......... 169 g/kWh
Ref. LCV .................................................. 42,700 kJ
Heat rate .................0.169 x 42,700 = 7,216 kJ/kWh
The heat rate is also referred to as the ‘Guiding
Equivalent Energy Consumption’.
Engine Power
The following tables contain data regarding the
power, speed and specific fuel oil consumption of
the engine.
Engine power is specified in kW for each cylinder
number and layout points L
1
, L
2
, L
3
and L
4
:
For conversions between kW and metric horsepow-
er, please note that 1 BHP = 75 kpm/s = 0.7355
kW.
L
1
designates nominal maximum continuous rating
(nominal MCR), at 100% engine power and 100%
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 110% of the power at
MCR, and may be permitted for a limited period of
one hour every 12 hours.
The engine power figures given in the tables re-
main valid up to tropical conditions at sea level as
stated in IACS M28 (1978), i.e.:
Blower inlet temperature ................................45 °C
Blower inlet pressure ............................1,000 mbar
Seawater temperature .................................... 32 °C
Relative humidity ..............................................60%
178 51 489.0
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