Page 82: of Maritime Reporter Magazine (October 1997)

RESEARCH & DEVELOPMENT — FUEL QUALITY e your business

UNITED

TECHNOLOGIES

CARRIER TMfJSSCOLD which are part of the WG, present- ed statistical data based on many thousand HFO samples, which had been analyzed for the presence of

ULO.

The conclusion was: —The presence of ULO in marine fuel is very low. —ULO in HFO is most frequently found in North American bunkers. —ULO in HFO contributes to a few cases of failing, if it is to meet the ISO 8217 ash limits.

A second question is, what risks are involved when waste lube oil is mixed into HFO?

From the WG discussions it was obvious that no one has proved what concentration of ULO are required to harm the engine and the exhaust gas system. However, if seen in terms of service experi- ence, it is agreed that metal com-

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TRANSICOLD 90CM Marine Centrifugal Chiller (l,700kW) pounds from a ULO will contribute to an increase in the ash level, and thereby the wear rates of the engine components, and lead to the possibility of further deposits form- ing and fouling that combustion zone and exhaust gas system.

However, the total ash level, as concluded by the major fuel testing services survey, is only in a few cases higher than the maximum ash content specified in ISO 8172 and CIMAC-H55.

With regard to separator efficien- cy, as a function of ULO amount, the results of an investigation car- ried out by one WG member showed the analytical data, obtained by testing fuel oil blends with three percent, six percent and 15 percent of ULO before and after a separator.

The differences observed in respect to the efficiency of the sep- arator removing water, catalytic fines and ash from high and low density residual fuels blended with the above-stained amounts of

ULO, were very small.

The opinion of the engine builders concerning the effect on the engine, when blending waste lube oil into HFO, is not consis- tent.

Fuel suppliers are also divided on this issue as some see no prob- lems with adding up to five per- cent waste lube oil, while others prefer to recommend the use of

HFO without any waste lube oil added.

The WG has not yet reached a final conclusion with regard to

ULO. However, the main body has so far emerged of the opinion as follows: —Waste, which is not lube oil, must not be mixed with the HFO due to safety considerations. —The fuel supplier should inform his customers about any sub- stances added to the HFO. —The concept of adding ULO to

HFO can influence the engine component wear rates and fouling of the gas ways. —The higher ash level, due to added ULO, will influence the con- tent of particulate in the exhaust gas emission.

Kjeld Aabo, Chairman CIMAC

Heavy Fuel Working Group

MAN B&W Diesel A/S

Wanda Fabriek, Secretary of