Examples of Graphic Calculation of SFOC
The examples shown in Fig. 2.09 and 2.10 are
valid for a standard high-load optimised engine.
The following Diagrams a, b and c, valid for fixed
pitch propeller (b) and constant speed (c), respec-
tively, show the reduction of SFOC in g/kWh, rela-
tive to the SFOC for the nominal MCR L
1
rating.
The solid lines are valid at 100%, 80% and 50% of
SMCR point M.
Point M is drawn into the abovementioned Dia-
grams b or c. A straight line along the constant
mep curves (parallel to L
1
L
3
) is drawn through
point M. The intersections of this line and the
curves indicate the reduction in specific fuel oil
consumption at 100, 80 and 50% of the SMCR
point M, related to the SFOC stated for the nomi-
nal MCR L
1
rating.
An example of the calculated SFOC curves are
shown in Diagram a, and is valid for an engine
with fixed pitch propeller, see Fig. 2.10.01.
For examples based on part-load and low-load
optimised engines, please refer to our publication:
SFOC Optimisation Methods
For MAN B&W Two-stroke IMO Tier II Engines
which is available at www.marine.man.eu → ’Two-
Stroke’ → ’Technical Papers’.
SFOC calculations can be made in the CEAS ap-
plication, see Section 20.02.
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