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Saturday, October 20, 2018


We have received the following bunker alert from Det Norske Veritas Petroleum Services (DNVPS).


Within the last two weeks Det Norske Veritas Petroleum Services have received four heavy fuel oil samples from bunkerings in the Great Belt area Denmark, with density levels exceeding the limit set in ISO 8217:1996 of 991.0 kg/m3. The highest density content was 999.3 kg/m3, with an average level of 996.9 kg/m3.

All these fuels contain elevated levels of combined Aluminium and Silicon, although within the combined Al+Si levels in ISO 8217:1996 spec of 80 mg/kg. The density is too high for conventional centrifuges, hence cleaning capacity will be reduced and fuel entering engine might not be sufficiently cleaned. If your vessel recently bunkered in this area, please ensure that the fuel quality is known before use.

As these fuels with high density also contained cat fines, we recommend, for best cleaning action, that the conventional centrifuge(s) should be operated temporarily as clarifier(s). Preferably split the flow between two clarifiers in parallel.  The combined flow should be the minimum to meet engine consumption. Shorten intervals between bowl discharges since this is the only way to remove water.  However, we cannot guarantee such operation will remove the abrasive materials sufficiently. To determine the efficiency of the centrifuges we recommend analysis of samples taken before and after the centrifuges.  This may be important to help you avoid serious damage to shipboard machinery.


Source: Det Norske Veritas Petroleum Services (DNVPS).