Page 51: of Maritime Reporter Magazine (July 1996)

activities include technology projects which aim at developing world-class technologies that can be implemented in Wartsila Diesel engines based on market demands. An example is the antipolishing ring, which has reduced the lubri- cating oil cost of the engine to one-third, and doubled the cylinder liner lifetime. Another example is the gas diesel technology which has proven very successful in floating production installations. On the emission control side, low

NOx combustion has made it possible to meet the coming IMO regulations with all Wartsila

Diesel engines, and for most them, a consider- able reduction of fuel consumption was achieved simultaneously. The direct water injec- tion technology released in 1995 brings NOx levels down to approximately half the level of the

IMO curve. For the stringent regulations, the compact SCR has been developed.

Cummins Marin*

Circle 141 on Reader Service Card

In a continuing effort to update its product line, Cummins Marine introduced the enhanced

KTA50-M2 as an ideal power choice for a vari- ety of commercial applications. The initial expectation for limited production has already been exceeded, and engines are now being installed around the world, including Germany,

Korea and Southeast Asia. The KTA50-M2 fea- tures Centry electronics, which offer adjustable all-speed governing, intermediate speed con- trols, dual power curves and improved transient response.

Valve Co. Offers Exhaust

And Valve Solutions

The Valve Company specializes in the field of diesel engine exhaust and valve operation, as well as maintenance, technical assistance and problem solving. A combina- tion of nimonic valves and the turnomat valve rotators are offered for HFO burning engines. This combination, together with improved cages reportedly leads to increased reliability, prolonged

TBO and reduced downtime.

For more information

Circle 90 on Reader Service Card

FULLY FUNCTIONING DAMPER

Vibration Damper Maintenance Affects

Engine Life Cycle

The complex dynamics and higher engine cylinder excitations of modern diesel engines require dampers for controlling resonant torsional vibration, and for ensuring a long service life. A fully functioning viscous damper works in preventing fatigue or failure of marine propulsion engines and drive trains. Reportedly, more than 50 percent of medium speed diesels and 15 percent of slow speed diesels are fitted with dampers. Most crankshaft vibration dampers use silicone fluid as the damping medium. The damper casing is rigidly attached to the fore end of the crankshaft, and encapsulates an inertia ring. The fluid restrains the internal iner- tia ring and dissipates vibratory energy as heat through the exter- nal surfaces of the damper casing. This provides a cost-effective solution for crankshaft protection, reduced gear wear and lower engine noise. The efficient operation of the viscous damper can be assessed by sampling the silicone fluid within the damper.

However, many engineers and maintenance technicians fail to take periodic samples of the viscous silicone fluid for analysis.

Holset Engineering is one manufacturer that provides both test kits and laboratory analysis of damper fluid. Holset Technical

Coordinator Terry Howard recommends a laboratory analysis of damper fluid every 15,000 hours of engine operation: "Fluid sampling is the only way to ensure the damper is still detuning or damping the harmful effects of vibratory energy. Neglect it and you could be facing an expensive damper rebuild, or risk serious damage to the engine and drive train."

Holset Engineering, located in Cincinnati, Ohio, reportedly developed the viscous damper technology "from its embryo stages in 1952, to being an enabling part of the engine transmission package development over the past 40 years," said Mr. Howard.

For more information on Holset Engineering

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