Recently FOBAS tested several residual fuel samples from
Singapore that exceeded the 60 mg/kg limit for Aluminium + Silicon as
stipulated in the ISO 8217:2010/12 specification. The fuels tested had values
of these catfines ranging between 74 to 81 mg/kg. Please note that these
results are within the ISO 8217:2005 (table 2) requirement of 80 mg/kg, however
the ISO working group, based on operational feedback and data, reduced the
limit to 60 mg/kg in subsequent editions of ISO 8217.
If your ships are planning to bunker in Singapore then we
suggest that the supplier is asked to provide a certificate of quality of the
particular stem to ensure that the Aluminium + Silicon concentration is known
at the time of bunkering and within the limits of the stipulated grade.
Particular attention should be given to the collection of fully representative
drip samples, ensuring all supporting documentation and samples drawn are
witnessed and signed for by all parties present.
Reduction of this abrasive material to satisfactorily low levels
will largely depend on the capability, effectiveness and management of the
onboard fuel treatment plant. Careful monitoring and operation of the fuel
treatment plant is needed to reduce the risk of carryover of these abrasive
elements to the engine rail which can cause increase in wear of fuel
pumps/injectors and cylinder components. This may include operating two
separators inline under optimum conditions of flow and temperature.
Furthermore, it is
recommended that during onboard treatment, system samples should be drawn and
analyzed in order to verify system performance if/as required.
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