MAN B&W
2.04
Page 2 of 9
MAN Diesel
198 69 93-5.3
MAN B&W MC/MC-C/ME/ME-C/ME-B/-GI-TII engines
Engine shaft power, % of A
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
7
5
4
1 2 6
7
8 4
1
2
6
5
M
3
9
Engine speed, % of A
60
65
70
75
80
85
90
95 100 105 110
Definitions
The engine’s load diagram, see Fig. 2.04.02, de-
fines the power and speed limits for continuous as
well as overload operation of an installed engine
having a specified MCR point M that confirms the
ship’s specification.
The service points of the installed engine incorpo-
rate the engine power required for ship propulsion
and shaft generator, if installed.
Operating curves and limits for continuous
operation
The continuous service range is limited by four
lines: 4, 5, 7 and 3 (9), see Fig. 2.04.02. The pro-
peller curves, line 1, 2 and 6 in the load diagram
are also described below.
Line 1:
Propeller curve through specified MCR (M), en-
gine layout curve.
Line 2:
Propeller curve, fouled hull and heavy weather
– heavy running.
Line 3 and line 9:
Line 3 represents the maximum acceptable speed
for continuous operation, i.e. 105% of M.
During trial conditions the maximum speed may
be extended to 107% of M, see line 9.
The above limits may in general be extended to
105% and during trial conditions to 107% of the
nominal L
1
speed of the engine, provided the tor-
sional vibration conditions permit.
The overspeed setpoint is 109% of the speed
in M, however, it may be moved to 109% of the
nominal speed
in L
1
, provided that torsional vibra-
tion conditions permit.
Running at low load above 100% of the nominal L
1
speed of the engine is, however, to be avoided for
extended periods. Only plants with controllable
pitch propellers can reach this light running area.
Line 4:
Represents the limit at which an ample air supply
is available for combustion and imposes a limita-
tion on the maximum combination of torque and
speed.
Regarding ‘i’ in the power function P = c x n
i
, see page 2.01.
M
Specified MCR point
Line 1 Propeller curve through point M (i = 3)
(engine layout curve)
Line 2 Propeller curve, fouled hull and heavy weather
– heavy running (i = 3)
Line 3 Speed limit
Line 4 Torque/speed limit (i = 2)
Line 5 Mean effective pressure limit (i = 1)
Line 6 Propeller curve, clean hull and calm weather
– light running (i = 3), for propeller layout
Line 7 Power limit for continuous running (i = 0)
Line 8 Overload limit
Line 9 Speed limit at sea trial
178 05 427.6
Fig. 2.04.02: Standard engine load diagram
Engine Load Diagram
Summary of Contents for B&W S50ME-B9.3-TII
Page 4: ......
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Page 11: ...MAN B W MAN Diesel Engine Design 1 ...
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Page 27: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
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Page 53: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
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Page 59: ...MAN B W MAN Diesel Electricity Production 4 ...
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Page 93: ...MAN B W MAN Diesel Installation Aspects 5 ...
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Page 133: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
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Page 155: ...MAN B W MAN Diesel Fuel 7 ...
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Page 171: ...MAN B W MAN Diesel Lubricating Oil 8 ...
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Page 189: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
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Page 199: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
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Page 203: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
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Page 209: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
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Page 221: ...MAN B W MAN Diesel Starting and Control Air 13 ...
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Page 227: ...MAN B W MAN Diesel Scavenge Air 14 ...
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Page 239: ...MAN B W MAN Diesel Exhaust Gas 15 ...
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Page 255: ...MAN B W MAN Diesel Engine Control System 16 ...
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Page 265: ...MAN B W MAN Diesel Vibration Aspects 17 ...
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Page 281: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
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Page 307: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
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Page 323: ...MAN B W MAN Diesel Project Support and Documentation 20 ...
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Page 333: ...MAN B W MAN Diesel Appendix A ...
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