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MAN B&W 2.04
110
100
90
80
70
60
50
40
Engine shaft power, % A
A 100% reference point
M Specified engine MCR
O Matching point
Heavy
running
operation
55 60 65 70 75 80 85 90 95 100 105 110 115 120
Engine speed, % A
Normal load
diagram area
MAN B&W ME/ME-C/ME-B/-GI-TII engines
4
2
L 3
L 4
1
Extended light
running area
A=O=M
5 7
Normal
operation
L 1
5%
L 2
6 3 3
Line 1: Propeller curve through matching point (O)
� layout curve for engine
Line 2: Heavy propeller curve
� fouled hull and heavy seas
Line 3: Speed limit
Line 3’: Extended speed limit, provided torsional vibration
conditions permit
Line 4: Torque/speed limit
Line 5: Mean effective pressure limit
Line 6: Increased light running propeller curve
� clean hull and calm weather
� layout curve for propeller
Line 7: Power limit for continuous running
178 60 79-9.0
Fig. 2.04.03: Extended load diagram for speed derated
engine with increased light running
MAN Diesel
Page 5 of 10
Examples of the use of the Load Diagram
In the following are some examples illustrating the
flexibility of the layout and load diagrams.
• Example 1 shows how to place the load diagram
for an engine without shaft generator coupled to
a fixed pitch propeller.
• Example 2 are diagrams for the same configuration,
but choosing a matching point on the left
of the heavy running propeller curve (2) providing
an extra engine margin for heavy running
similar to the case in Fig. 2.04.03.
• Example 3 shows the same layout for an engine
with fixed pitch propeller (example 1), but with a
shaft generator.
• Example 4 <strong>is</strong> a special case of example 3, where
the specified MCR <strong>is</strong> placed near the top of the
layout diagram.
In th<strong>is</strong> case the shaft generator <strong>is</strong> cut off,
and the GenSets used when the engine runs
at specified MCR. <strong>Th<strong>is</strong></strong> makes it possible to
choose a smaller engine with a lower power output.
• Example 5 shows diagrams for an engine
coupled to a controllable pitch propeller, with
or without a shaft generator, constant speed or
combinator curve operation.
For a specific project, the layout diagram for actual
project shown later in th<strong>is</strong> chapter may be used
for construction of the actual load diagram.
198 69 93-5.1