Additional information
During reloading and transfer, MDO is treated like residual oil. It is possible
that oil is mixed with high-viscosity fuel or heavy fuel oil, for example with res-
idues of such fuels in the bunker vessel, which can markedly deteriorate the
properties. Admixtures of biodiesel (FAME) are not permissible!
Normally, the lubricating ability of diesel oil is sufficient to operate the fuel
injection pump. Desulphurisation of diesel fuels can reduce their lubricity. If
the sulphur content is extremely low (< 500 ppm or 0.05%), the lubricity may
no longer be sufficient. Before using diesel fuels with low sulphur content,
you should therefore ensure that their lubricity is sufficient. This is the case if
the lubricity as specified in ISO 12156-1 does not exceed 520 μm.
You can ensure that these conditions will be met by using motor vehicle die-
sel fuel in accordance with EN 590 as this characteristic value is an integral
part of the specification.
The fuel must be free of lubricating oil (ULO – used lubricating oil, old oil).
Fuel is considered as contaminated with lubricating oil when the following
concentrations occur:
Ca > 30 ppm and Zn > 15 ppm or Ca > 30 ppm and P > 15 ppm.
The pour point specifies the temperature at which the oil no longer flows. The
lowest temperature of the fuel in the system should be roughly 10 °C above
the pour point to ensure that the required pumping characteristics are main-
tained.
A minimum viscosity must be observed to ensure sufficient lubrication in the
fuel injection pumps. The temperature of the fuel must therefore not exceed
45 °C.
Seawater causes the fuel system to corrode and also leads to hot corrosion
of the exhaust valves and turbocharger. Seawater also causes insufficient
atomisation and therefore poor mixture formation accompanied by a high
proportion of combustion residues.
Solid foreign matters increase mechanical wear and formation of ash in the
cylinder space.
We recommend the installation of a separator upstream of the fuel filter. Sep-
aration temperature: 40 – 50°C. Most solid particles (sand, rust and catalyst
particles) and water can be removed, and the cleaning intervals of the filter
elements can be extended considerably.
Handling of operating fluids
Handling of operating fluids can cause serious injury and damage to
the environment.
• Observe safety data sheets of the operating fluid supplier.
Analyses
Analysis of fuel oil samples is very important for safe engine operation. We
can analyse fuel for customers at MAN Diesel & Turbo laboratory PrimeServ-
Lab.
Lubricity
Specification of diesel oil (MDO) D010.000.023-04-0001
General
2017-07-11 - de
010.000.023-04
MAN Diesel & Turbo
2 (2) D010.000.023-04-0001 EN
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