Page 94: of Maritime Reporter Magazine (April 1998)

SCANDINAVIAN REPORT

Controlling Market Thrusts

Molde, Norway based Brunvoll, a maker of advanced thruster technology, has dedicated much of its resources to ensuring noise and vibration signatures are kept to a bare minimum, particularly in cruise vessel applications. While exhibiting in Miami at a recent cruise industry event, Brunvoll's marketing director, Terje Dyrseth, noted that the cruise market is of particular interest and importance to the company. He said "on the cruise ship side, it's quite simple, because they need the thruster to maneuver...maneuverability is a key issue for cruise liners, and it's important because of the multiple installation configurations aboard a single ship."

An interesting development in the cruise market, however, which is significantly impacting the use and development of thrusters for the cruise market, is the issue of ship anchors' effects on coral reefs. Mr. Dyrseth said that most cruise lines have traditionally not been concerned with noisy bowthrusters, because the only time they were used was for maneuvering, at a time when most passengers are on deck. Now, however, with increased sensitivity to the plight of coral reefs in the

Caribbean, ships may increasingly have to use thrusters and propellers to "anchor" the ship, meaning that they will be used continu- ously for longer periods, making noise and vibra- tion a more significant issue.

While he terms

Brunvoll's products "noth- ing very new," Mr.

Dyrseth does point out that the lengths Brunvoll has taken to mitigate noise is new to the cruise market. In particular, Brunvoll helps to minimize noise and vibration by insulating the tunnel which houses the thruster. In essence, the configuration is two tun- nels, one resiliently mounted inside the other, so that there is no metal to metal contact directly with the actual thruster and the ship.

Circle 64 on Reader Service Card

Brunvoll bowthruster cross section

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Circle 286 on Reader Service Card

Circle 298 on Reader Service Card

Experience gained by the com- pany during the development of its proprietary Low NOx

Combustion process provided the basis for a target 50 percent effi- ciency for the Wartsila 64. The feasibility of the target figure was said to have been confirmed soon after the six-cylinder prototype had been fired-up at the Vaasa research center in September 1996, with turbocharger efficien- cy having been highlighted as a key contributor to overall perfor- mance. Due to specially designed injection arrangements, maxi- mum cylinder temperature is reportedly lower than in a normal

Seiliger process, and consequent- ly a factor contributing to a reduction in NOx output. In line with the Finnish company's con- cept of focused production, com- mercial manufacture of the

Wartsila 64 has been assigned to

Grandi Motori Trieste (GMT) in

Italy, in which Wartsila NSD has a 40 percent holding following the

April 1997 merger of the diesel engine operations of the Metra

Group and Fincantieri. The extremely powerful, clean-lined 640-mm bore design in its V con- figurations is advocated for diesel-electric installations, in particular, in regard to the cur- rent field of application and possi- ble new areas, such as large con- tainership propulsion.

The operating loss of $18.2 mil- lion recorded by Wartsila NSD in 1997 reflected non-recurring restructuring costs, year-end dif- ficulties arising from the finan- cial situation in eastern Asia, and higher-than-anticipated outgo- ings associated with bringing new engine types to market. Higher development and introduction costs in the high-speed diesel sec- tor topped the results for

Wartsila France and Cummins

Wartsila Engine Co. (CWEC). To enhance performance in this field, a new joint venture compa- ny was formed with the U.S. group.

Named Cummins-Wartsila

Corp., this will cover the 600 to 4,500 kW output range, and include the high-speed activities of Wartsila France, all CWEC operations in France and the

U.K., and part of Cummins PGI.

Wartsila NSD has also forged cooperation in the Japanese mar- ket by entering into an alliance with Hitachi Zosen. The Wartsila 20 design and Wartsila 32, the of CP propulsion where fuel economy, reduced emission and safe environment for passengers and crew are vital.

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N-5420 Rubbestadneset, Nora/ay

Telefone: +47 53 42 39 50

Telefax: +47 53 42 39 99 e-mail: [email protected] 86 Maritime Reporter/Engineering News