Man B&W S50MC-C8-TII - Examples of Graphic Calculation of SFOC

MAN B&W 2.08
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MAN Diesel
MAN B&W MC/MC-C-TII engines 198 70 18-9.0
Examples of Graphic Calculation of SFOC
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
the optimising point (O).
Point O is drawn into the abovementioned Dia-
grams b or c. A straight line along the constant
mep curves (parallel to L
1
L
3
) is drawn through
point O. The intersections of this line and the
curves indicate the reduction in specific fuel oil
consumption at 100, 80 and 50% of the optimis-
ing point, 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.