MAN B&W
2.04
Page 1 of 10
MAN Diesel
198 69 94-7.1
MAN B&W MC/MC-C-TII engines
Engine Layout and Load Diagram
Engine Layout Diagram
An engine’s layout diagram is limited by two con-
stant mean effective pressure (mep) lines L
1
– L
3
and L
2
– L
4
, and by two constant engine speed
lines L
1
– L
2
and L
3
– L
4
. The L
1
point refers to the
engine’s nominal maximum continuous rating, see
Fig. 2.04.01.
In the layout area, the engine’s specified SMCR
point M can be set freely to suit the ship’s de-
mand for propeller power and speed.
On the horizontal axis and on the vertical axis the
engine speed and the engine power are shown,
respectively, on percentage scales. The scales
are logarithmic, which means that, in this diagram,
power function curves like propeller curves (3rd
power), constant mean effective pressure curves
(1st power) and constant ship speed curves (0.15
to 0.30 power) are straight lines.
Specified maximum continuous rating (M)
Based on the propulsion and engine running
points, found previously, the layout diagram of a
relevant main engine can be drawnin. The SMCR
point (M) must be inside the limitation lines of the
layout diagram; if it is not, the propeller speed
must be changed or another main engine type
chosen.
Continuous service rating (S)
The continuous service rating is the power need-
ed in service - including the specified sea margin
and heavy/light running factor of the propeller
- at which the engine is to operate, and point S
is identical to the service propulsion point (SP)
unless a main engine driven shaft generator is
installed.
Optimising point (O)
The optimising point O is the rating at which the
turbocharger is matched, and at which the engine
timing and compression ratio are adjusted. Point
M normally coincides with point O.
The optimising point O is placed on line 1 of the
load diagram, see Fig. 2.04.02, and for technical
reasons the optimised power always has to be
equal to 100% of point M’s power.
L
1
L
2
L
3
L
4
Speed
Power
O=M
S
1
Fig. 2.04.01: Engine layout diagram
178 60 85-8.0
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