MAN B&W
2.04
Page 1 of 9
MAN Diesel
198 69 93-5.3
MAN B&W MC/MC-C/ME/ME-C/ME-B/-GI-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.
Within the layout area there is full freedom to se-
lect the engine’s specified SMCR point M which
suits the demand for propeller power and speed
for the ship.
On the horizontal axis the engine speed and on
the vertical axis the engine power are shown 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, as previously found, the layout diagram
of a relevant main engine may be drawnin. The
SMCR point (M) must be inside the limitation lines
of the layout diagram; if it is not, the propeller
speed will have to be changed or another main
engine type must be chosen. The selected SMCR
has an influence on the turbocharger and its
matching and the compression ratio.
For
ME and ME-C/-GI
engines, the timing of the
fuel injection and the exhaust valve activation are
electronically optimised over a wide operating
range of the engine.
For
ME-B
engines, only the fuel injection (and not
the exhaust valve activation) is electronically con-
trolled over a wide operating range of the engine.
178 60 85-8.1
Fig. 2.04.01: Engine layout diagram
L
1
L
2
L
3
L
4
Speed
Power
M
S
1
For a standard high-load optimised engine,
the lowest specific fuel oil consumption for
the ME and ME-C engines is optained at 70%
and for MC/MC-C/ME-B engines at 80% of the
SMCR point (M).
For
ME-C-GI
engines operating on LNG, a further
SFOC reduction can be obtained.
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 in-
stalled.
Summary of Contents for B&W S50ME-B9.3-TII
Page 4: ......
Page 10: ......
Page 11: ...MAN B W MAN Diesel Engine Design 1 ...
Page 12: ......
Page 27: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
Page 28: ......
Page 53: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
Page 54: ......
Page 58: ......
Page 59: ...MAN B W MAN Diesel Electricity Production 4 ...
Page 60: ......
Page 92: ......
Page 93: ...MAN B W MAN Diesel Installation Aspects 5 ...
Page 94: ......
Page 124: ......
Page 133: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
Page 134: ......
Page 154: ......
Page 155: ...MAN B W MAN Diesel Fuel 7 ...
Page 156: ......
Page 170: ......
Page 171: ...MAN B W MAN Diesel Lubricating Oil 8 ...
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Page 189: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
Page 190: ......
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 ...
Page 222: ......
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 ...
Page 256: ......
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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