MAN B&W
9.02
Page 2 of 5
MAN Diesel
MAN B&W S50MC6, S50MCC7/8, S46MC-C7/8, S42MC7,
S35MC7, L35MC6, S26MC6
198 76 15-6.0
Basic and minimum setting with Alpha ACC
The recommendations are valid for all plants,
whether controllable pitch or fixed pitch propellers
are used.
Safe and very lubricatingeconomical control after
running-in is obtained with a basic setting accord-
ing to the formula:
Basic lubricating oil setting = 0,26 g/kWh x S%
with a minimum setting of 0,60 g/kWh, i.e. the
setting should be kept constant from about 2.3%
sulphur and downwards.
Alpha Adaptive Cylinder Oil Control (Alpha ACC)
It is a wellknown fact that the actual need for
cylinder oil quantity varies with the operational
conditions such as load and fuel oil quality. Con-
sequently, in order to perform the optimal lubrica-
tion – costeffectively as well as technically – the
cylinder lubricating oil dosage should follow such
operational variations accordingly.
The Alpha lubricating system offers the possibility
of saving a considerable amount of cylinder lubri-
cating oil per year and, at the same time, to obtain
a safer and more predictable cylinder condition.
The name of the algorithm which controls the
cylinder oil dosage proportional to the sulphur
content in the fuel is Alpha Adaptive Cylinder oil
Control, Alpha ACC.
Working principle
The basic feed rate control should be adjusted in
relation to the actual fuel quality and amount be-
ing burnt at any given time. The sulphur percent-
age is a good indicator in relation to wear, and an
oil dosage proportional to the sulphur level will
give the best overall cylinder condition.
The following two criteria determine the control:
•
The cylinder oil dosage shall be proportional to
the sulphur percentage in the fuel
•
The cylinder oil dosage shall be proportional to
the engine load (i.e. the amount of fuel entering
the cylinders).
The implementation of the above two criteria will
lead to an optimal cylinder oil dosage, proportion-
al to the amount of sulphur entering the cylinders.
178 61 184.0
Due to the sulphur dependency, the average cyl-
inder oil dosages rely on the sulphur distribution
in worldwide fuel bunkers. Based on deliveries all
over the world, the resulting yearly specific cylin-
der oil dosage is close to 0.7 g/kWh.
Further information on cylinder oil as a function of
fuel oil sulphur content and alkalinity of lubricating
oil is available from MAN Diesel.
Fig 9.02.01: Cylinder lubricating oil dosage with Alpha
ACC at all loads (BN 70 cylinder oil) after running-in
Sulphur %
Absolute dosage (g/kWh)
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
0
0.5
1
1.5
2
2.5
3
3.5
4
Summary of Contents for B&W L35MC6-TII
Page 4: ......
Page 10: ......
Page 18: ......
Page 19: ...MAN B W MAN Diesel Engine Design 1 ...
Page 20: ......
Page 35: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
Page 36: ......
Page 52: ......
Page 64: ......
Page 65: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
Page 66: ......
Page 72: ......
Page 73: ...MAN B W MAN Diesel Electricity Production 4 ...
Page 74: ......
Page 95: ...MAN B W MAN Diesel Installation Aspects 5 ...
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Page 132: ......
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Page 147: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
Page 148: ......
Page 171: ...MAN B W MAN Diesel Fuel 7 ...
Page 172: ......
Page 186: ......
Page 187: ...MAN B W MAN Diesel Lubricating Oil 8 ...
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Page 203: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
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Page 213: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
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Page 217: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
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Page 223: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
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Page 235: ...MAN B W MAN Diesel Starting and Control Air 13 ...
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Page 243: ...MAN B W MAN Diesel Scavenge Air 14 ...
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Page 257: ...MAN B W MAN Diesel Exhaust Gas 15 ...
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Page 273: ...MAN B W MAN Diesel Engine Control System 16 ...
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Page 289: ...MAN B W MAN Diesel Vibration Aspects 17 ...
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Page 305: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
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Page 329: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
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Page 361: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
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Page 371: ...MAN B W MAN Diesel Appendix A ...
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