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MAN B&W 7.02
Fuel oils
Marine diesel oil:
Marine diesel oil ISO 82 7, Class DMB
Brit<strong>is</strong>h Standard 6843, Class DMB
Similar oils may also be used
Heavy fuel oil (HFO)
Most commercially <strong>available</strong> HFO with a v<strong>is</strong>cosity
below 700 cSt at 50 °C (7,000 sec. Redwood I at
00 °F) can be used.
For guidance on purchase, reference <strong>is</strong> made
to ISO 82 7: 996 and ISO 82 7:2005, Brit<strong>is</strong>h
Standard 6843 and to CIMAC recommendations
regarding requirements for heavy fuel for diesel
engines, fourth edition 2003, in which the maximum
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 specifications
refer to fuel 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 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 treatment
systems are installed.
Current analys<strong>is</strong> information <strong>is</strong> not sufficient for
estimating the combustion properties of the oil.
<strong>Th<strong>is</strong></strong> means that service results depend on oil
properties which cannot be known beforehand.
<strong>Th<strong>is</strong></strong> 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
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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 th<strong>is</strong> specification have,
to the extent of the commercial availability, been
used with sat<strong>is</strong>factory 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 specification (maximum values)
Density at 5 °C kg/m3 Kinematic v<strong>is</strong>cosity
< .0 0*
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 clarifiers are installed
m/m = mass v/v = volume
If heavy fuel oils with analys<strong>is</strong> data exceeding the
above figures are to be used, especially with regard
to v<strong>is</strong>cosity and specific gravity, the engine
builder should be contacted for advice regarding
possible fuel oil system changes.
MAN B&W MC/MC-C, ME/ME-C/ME-GI/ME-B engines 198 38 80-4.5
MAN Diesel