MAN B&W L28/32H, Руководство пользователя

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08028-0D\H5250\94.08.12
General
Commercially available fuel oils with a viscosity up to
700 cSt at 50° C corresponding to 55 cSt at 100° C
can be used for MAN B&W Holeby 4-stroke medium
speed diesel engines.
For guidance on purchase, reference is made to ISO
8216/17, BS 6843 and to CIMAC recommendations
regarding requirements for heavy fuel for diesel
engines, third edition 1990. From these maximum
accepted grades are RMH 55 and K55. The mention-
ed ISO and BS standards supersedes BS MA 100 in
which the limit is M9.
It means that engines can be operated on the same
fuel oils as MAN B&W 2-stroke low-speed diesel
engines.
The data in the above HFO standards and specifica-
tions refer to the same fuel type as delivered to the
ship, i.e. before on-board cleaning.
In order to ensure effective and sufficient cleaning of
the HFO, i.e. removal of water and solid contaminants,
the fuel oil specific gravity at 15° C (60° F) should be
below 0.991. Higher densities can be allowed if
special treatment systems are installed.
Current analysis information is not sufficient for
estimating the combustion properties of the oil.
This means that service results depend on oil pro-
perties 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 necessary to rule
out some oils that cause difficulties.
Guiding Heavy Fuel Oil Specification
Based on our general service experience we have,
as a supplement to the above-mentioned standards,
drawn up the guiding HFO-specification shown below.
Heavy fuel oils limited by this specification have, to
the extent of the commercial availability, been used
with satisfactory results on MAN B&W GenSets.
99.33
Fuel Oil Specification B 11 00 0
1609529-6.3
Page 1 (3)
m/m = mass V/V = volume
*) May be increased to 1.010 provided adequate
cleaning equipment is installed, and modern
type of centrifuges.
If heavy fuel oils, with analysis data exceeding the
above figures, are to be used, especially with regard
to viscosity and specific gravity, the engine builder
should be contacted for advice regarding possible
changes in the fuel oil system.
The data refer to the fuel as supplied, i.e. before
any on-board cleaning.
Property
Density at 15°C
Kinematic
viscosity
at100°C
at 50 °C
Flash point
Pour point
Carbon redisue
Ash
Total sediment
after ageing
Water
Sulphur
Vanadium
Alu
Silicon
Value
£
991*
£
55
£
700
>
60
£
30
£
22
£
0.15
£
0.10
£
1.0
£
5.0
£
600
£
80
Units
kg/m
3
cSt
cSt
°C
°C
% (m/m)
% (m/m)
% (m/m)
% (v/v)
% (m/m)
mg/kg
mg/kg