Man B&W S80ME-C7 User Manual

MAN B&W 7.02
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MAN Diesel
MAN B&W MC/MC-C, ME/ME-C/ME-GI/ME-B engines
198 38 80-4.5
Fuel oils
Marine diesel oil:
Marine diesel oil ISO 827, Class DMB
British Standard 6843, Class DMB
Similar oils may also be used
Heavy fuel oil (HFO)
Most commercially available HFO with a viscosity
below 700 cSt at 50 °C (7,000 sec. Redwood I at
00 °F) can be used.
For guidance on purchase, reference is made
to ISO 827:996 and ISO 827:2005, British
Standard 6843 and to CIMAC recommendations
regarding requirements for heavy fuel for diesel
engines, fourth edition 2003, in which the maxi-
mum acceptable grades are RMH 700 and RMK
700. The abovementioned ISO and BS standards
supersede BSMA 00 in which the limit was M9.
The data in the above HFO standards and speci-
cations refer to fuel as delivered to the ship, i.e.
before on-board cleaning.
In order to ensure effective and sufcient cleaning
of the HFO, i.e. removal of water and solid con-
taminants, the fuel oil specic gravity at 5 °C (60
°F) should be below 0.99, unless modern types
of centrifuges with adequate cleaning abilities are
used.
Higher densities can be allowed if special treat-
ment systems are installed.
Current analysis information is not sufcient for
estimating the combustion properties of the oil.
This means that service results depend on oil
properties which cannot be known beforehand.
This especially applies to the tendency of the oil
to form deposits in combustion chambers, gas
passages and turbines. It may, therefore, be nec-
essary to rule out some oils that cause difculties.
Guiding heavy fuel oil specication
Based on our general service experience we have,
as a supplement to the above mentioned stand-
ards, drawn up the guiding HFO specication
shown below.
Heavy fuel oils limited by this specication have,
to the extent of the commercial availability, been
used with satisfactory results on MAN B&W
twostroke low speed diesel engines.
The data refers to the fuel as supplied i.e. before
any on-board cleaning.
Guiding specication (maximum values)
Density at 5 °C
kg/m
3
< .00*
Kinematic viscosity
at 00 °C
cSt < 55
at 50 °C cSt < 700
Flash point °C > 60
Pour point °C < 30
Carbon residue % (m/m) < 22
Ash % (m/m) < 0.5
Total sediment potential % (m/m) < 0.0
Water % (v/v) < 0.5
Sulphur % (m/m) < 4.5
Vanadium mg/kg < 600
Aluminum + Silicon mg/kg < 80
Equal to ISO 827:2005 - RMK 700
/ CIMAC recommendation No. 2 - K700
* Provided automatic clariers are installed
m/m = mass v/v = volume
If heavy fuel oils with analysis data exceeding the
above gures are to be used, especially with re-
gard to viscosity and specic gravity, the engine
builder should be contacted for advice regarding
possible fuel oil system changes.

Man B&W S80ME-C7 Specifications

General

Brand	Man
Model	B&W S80ME-C7
Category	Engine
Language	English