MAN B&W 2.08
Page of
MAN Diesel
MAN B&W ME/ME-C/ME-GI engines 198 38 37-5.5
Examples of graphic calculation of SFOC
The following diagrams b and c valid for xed
pitch propeller and constant speed, respectively,
show the reduction of SFOC in g/kWh, relative to
the SFOC for the nominal MCR L
1
rating.
The solid lines are valid at 100, 70 and 50% of the
matching point (O).
Point O is drawn into the abovementioned Dia-
gram 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 specic fuel oil
consumption at 100, 70 and 50% of the matching
point, related to the SFOC stated for the nominal
MCR L
1
rating.
An example of the calculated SFOC curves for
an engine with xed pitch propeller are shown in
Diagram a, and are valid for two alternative engine
ratings:
• Matching point O
1
, at 100% of M
• Matching point O
at 90% of M
See g. .10.01.
90% is a typical chosen matching point, randomly
chosen between 85100% in order to reduce
SFOC at part load running.
To Next Page
Loading...
Need help?
General