MAN B&W
1.01
Page 2 of 2
MAN Diesel
199 01 12-5.0
MAN B&W ME-C/ME-B-TII .5/.3 engines
Tier II fuel optimisation
NO
x
regulations place a limit on the SFOC on
two-stroke engines. In general, NO
x
emissions will
increase if SFOC is decreased and vice versa. In
the standard configuration, MAN B&W engines are
optimised close to the IMO NO
x
limit and, there-
fore, NO
x
emissions may not be further increased.
The IMO NO
x
limit is given as a weighted average
of the NO
x
emission at 25, 50, 75 and 100% load.
This relationship can be utilised to tilt the SFOC
profile over the load range. This means that SFOC
can be reduced at part load or low load at the
expense of a higher SFOC in the high-load range
without exceeding the IMO NO
x
limit.
Optimisation of SFOC in the part-load (50-85%)
or low-load (25-70%) range requires selection of a
tuning method:
• ECT: Engine Control Tuning
• VT:
Variable Turbine Area
• EGB: Exhaust Gas Bypass
• HPT: High Pressure Tuning (only for ME-C)
Each tuning method makes it possible to optimise
the fuel consumption when normally operating at
low loads, while maintaining the possibility of op-
erating at high load when needed.
The tuning methods are available for all SMCR in
the specific engine layout diagram but they can-
not be combined. The specific SFOC reduction
potential of each tuning method together with
full rated (L
1
/L
3
) and maximum derated (L
2
/L
4
) is
shown in Section 1.03.
For engine types 40 and smaller, as well as for
larger types with conventional turbochargers, only
high-load optimisation is applicable.
In general, data in this project guide is based on
high-load optimisation unless explicitly noted. For
part- and low-load optimisation, calculations can
be made in the CEAS application described in
Section 20.02.
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 ...
Page 172: ......
Page 188: ......
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 ...
Page 200: ......
Page 202: ......
Page 203: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
Page 204: ......
Page 209: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
Page 210: ......
Page 220: ......
Page 221: ...MAN B W MAN Diesel Starting and Control Air 13 ...
Page 222: ......
Page 227: ...MAN B W MAN Diesel Scavenge Air 14 ...
Page 228: ......
Page 239: ...MAN B W MAN Diesel Exhaust Gas 15 ...
Page 240: ......
Page 254: ......
Page 255: ...MAN B W MAN Diesel Engine Control System 16 ...
Page 256: ......
Page 265: ...MAN B W MAN Diesel Vibration Aspects 17 ...
Page 266: ......
Page 280: ......
Page 281: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
Page 282: ......
Page 302: ......
Page 306: ......
Page 307: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
Page 308: ......
Page 322: ......
Page 323: ...MAN B W MAN Diesel Project Support and Documentation 20 ...
Page 324: ......
Page 332: ......
Page 333: ...MAN B W MAN Diesel Appendix A ...
Page 334: ......