Page 33: of Maritime Reporter Magazine (October 15, 1981)
affected by the rpm of the main engine.
Notable features of the system include:
Adoption of the Omega clutch stabilizes the speed of shaft rev- olutions at the output even if the revolution speed at the input should change drastically. As a result, main engine-driven electric power generation becomes possi- ble even for vessels with fixed- pitch propellers, which normally makes such power generation dif- ficult.
As it enables the main engine to drive the generator, grade C heavy oil can be used in place of the normally used grade A heavy oil. The price difference between the two grades of heavy oil re- sults in a saving of 25 to 30 per- cent in power generation cost.
Smooth switch-over — without blackout as originally feared — from the main shaft-driven gen- erator to the independent auxil- iary generator in a crash astern while at sea or when navigating at slow speed in entering or leav- ing port, has been verified.
For additional information on
Niigata diesels and the power generating system,
Write 65 on Reader Service Card
During the late seventies, Oost- erhuis Industries researched the
U.S. domestic and foreign engine market for lower horsepower, high-rpm diesels capable of op- erating successfully on lower- quality fuel oils. This search re- sulted in the appointment of
Oosterhuis as distributors of SN and Daiya diesels for Mitsubishi
Heavy Industries America, Inc.
The high-speed Mitsubishi SN
Series diesel engines are manu- factured by Mitsubishi at its modern plant in Sagamihara near
Tokyo, and shipped to Ooster- huis in standard execution. At
Oosterhuis' facilities, engines are further packaged for U.S. do- mestic use, which includes the installation of U.S.-made SN full- flow lube oil filters, and the in- corporation of Synchro-Start overspeed devices and Murphy in- strument panels.
The Mitsubishi SN Series are available in a power range of 350 to 1,600-bhp as propulsion units for offshore supply vessels, tug- boats, pushboats, and for gener- ator drives and other applica- tions. The rpm ranges from 1,200 to 1,800 at maximum continuous rating.
Recent orders include quadruple engine installations for tug/sup- ply vessels utilizing two S16N and two S8N engines driving through hydraulic compound gears, with master and slave con- trols and fixed propeller. The 8- cylinder S8N starboard engine drives, while disconnected from the propeller shaft, a mud com- pressor by means of a front- mounted power take-off. The port- side S8N engine has a similar hook-up with a fire pump con- nected to a high-pressure, large- capacity fire monitor on deck.
Other quadruple installations call for use of four S16N engines with controllable-pitch propellers.
In addition to the packaging and marketing of Mitsubishi SN diesels, Oosterhuis Industries, through its affiliated company,
American Brons Corporation, maintains a license for manufac- turing of Turbodiesels designed by Brons Industrie of the Neth- erlands. The first American Brons diesels became operational during 1979. They have logged approxi- mately 10,000 hours, and have proven to be reliable and econom- ical to operate.
For additional information on the Mitsubishi SN Series and the
American Brons Turbodiesels,
Write 66 on Reader Service Card
U.K. engine builder Paxman
Diesels has developed a new su- percharged engine in a bid for submarine orders. Derived from
Paxman's Valenta engine line, the now model relies on a mechanical supercharger rather than a tur- bocharger. The company hopes that this engine will operate sat- isfactorily when a submarine is (continued on page 40)
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October 15, 1981 Write 3432 on Reader Service Card 37