Page 70: of Maritime Reporter Magazine (October 2001)

section eventually is deposited in the centrifuge sludge where it is easily removed. The only maintenance required is replacement of the sludge collection paper in the separator.

Service Intervals Increased From 250 to 1,000 hours

The majority of the savings are the result of reduced maintenance hours as a result of extended intervals between ser- vice. On average, each boat with four engines requires 12 oil changes per year, totaling 144 man hours. In contrast, ser- vice on the Eliminator and the Centinel engine is required at 1,000-hour inter- vals and takes only two to three hours per engine for separator maintenance and oil top-off.

Oil drainage intervals have been extended from 250 to 4,000 hours and, in some cases, indefinitely with good oil analysis results. "So far the oil is still golden brown instead of black; we've seen no soot at all in the oil and iron deposits were less than 13 ppm.

Cummin's Centinel system blends used oil with the fuel to be combusted in the power cylinders, which allows the oil to be converted to useful energy in the diesel engines.

Anything less than 100 ppm is not bad.

We have not noticed any oil consump- tion either," says Tarrant. "As a bonus, we expect to see 18,000 to 20,000 hours of service before the engines need a major overhaul. The normal interval between overhauls for engines not equipped with the Eliminator has been 9,000 to 12,000 hours of service." "There are other intangible benefits with the Eliminator filter system," says

Tarrant. "Changing oil is not a fun job; you can put a price on downtime but not on aggravation and headaches. With the

Eliminator, we avoid the environmental issues involved with disposing of oil and filters and safety issues with employees handling and carrying wastes up the gal- ley stairs. Each engine needs 35 gallons of oil and that means 35 gallons of dirty oil that has to go up the stairs and 35 gal- lons of new oil that has to be carried down the stairs. The only waste product • FULL FLOW DIRTY LUBE OIL INTO FILTER • 95% FULL FLOW FILTERED OIL INTO ENGINE

Q 5% BACKFLUSHED FLOW INTO CENTRIFUGE [""I CENTRIFUGED OIL BACK TO SUMP with the Eliminator is one piece of paper and that is the filter. This frees up our maintenance crew to perform other duties on the boat."

Alfa Laval developed the Eliminator in the mid 1990s in cooperation with Cum- mins Inc. in response to the need for reduced maintenance and fewer spare parts in marine applications.

The Eliminator is installed on the engines on three of the Boston Harbor

Cruises' boats, Nora Vittoria, Millenni- um and Aurora. The three identical pas- senger ferries, which measure 121 ft. (36.8 m), have a capacity of 400 passen- gers, and can operate as high-speed commuter ferries and excursion boats for whale watches in the Boston Harbor.

They are owned and operated by Boston

Harbor Cruises, which is one of the largest passenger boat companies in the country. Founded in 1926, the company has 175 year-round employees and 300 seasonal employees and owns and oper- ates 25 vessels on the Boston Harbor and Narraganset Bay, carrying more than 1.9 million passengers annually.

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The preceding was authored by by Greg

Schmelz, key account manager, Diesel

OEM, Alfa Laval Inc., Greenwood, bid.

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