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MAN B&W 2.04
Example 3: Normal running conditions.
Engine coupled to fixed pitch propeller (FPP) and with shaft generator
Layout diagram Load diagram
Power, % of L1 100% 7
L 3
L 4
M Specified MCR of engine
S Continuous service rating of engine
O Matching point of engine
A Reference point of load diagram
MP Specified MCR for propulsion
SP Continuous service rating of propulsion
SG Shaft generator power
In example 3 a shaft generator (SG) <strong>is</strong> installed, and therefore
the service power of the engine also has to incorporate the
extra shaft power required for the shaft generator’s electrical
power production.
In the figure, the engine service curve shown for heavy running
incorporates th<strong>is</strong> extra power.
MAN B&W ME/ME-C/ME-B/-GI-TII engines
5
4
1 2 6
Engine
service
curve
1 2 6
Engine speed, % of L 1
A=O=M
S
SG
SP
SG
MP
Propulsion curve for fouled
hull and heavy weather
7
100%
L 1
L 2
MAN Diesel
Power, % of L 1
100%
Engine service curve for
fouled hull and heavy
weather incl. shaft
generator
4
1 2 6
Engine speed, % of L 1
3.3%A 5%A
A=O=M
Propulsion curve for fouled
hull and heavy weather
Page 8 of 10
100%
Point A of load diagram <strong>is</strong> found:
Line 1 Propeller curve through matching point (O)
Line 7 Constant power line through specified MCR (M)
Point A Inter<strong>section</strong> between line 1 and 7
The matching point O = A = M will be chosen on th<strong>is</strong> curve, as
shown.
Point A <strong>is</strong> then found in the same way as in example 1 and the
load diagram can be drawn as shown in the figure.
Fig. 2.04.06: Normal running conditions. Engine coupled to a fixed pitch propeller (FPP) and with a shaft generator
L 3
L 4
5
S
SP
MP
7
3
L 1
5%L 1
L 2
3
178 05 48�8.8
198 69 93-5.1