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MAN B&W 2.08
Examples of graphic calculation of SFOC
The following diagrams b and c valid for fixed
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 <strong>is</strong> drawn into the above�mentioned Diagram
b or c. A straight line along the constant
mep curves (parallel to L 1 �L 3 ) <strong>is</strong> drawn through
point O. The inter<strong>section</strong>s of th<strong>is</strong> line and the
curves indicate the reduction in specific 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 fixed 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 fig. .10.01.
90% <strong>is</strong> a typical chosen matching point, randomly
chosen between 85�100% in order to reduce
SFOC at part load running.
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MAN B&W ME/ME-C/ME-GI engines 198 38 37-5.5
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