Page 10: of Maritime Reporter Magazine (March 1999)

INVESTMENT IN DESIGN

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Ph: 906-863-5553 Fax: 906-863-5634 Email: [email protected] powered by low-speed diesels.

Definition and basic design of the propulsion plant for the 125,000 dwt

Millennium-class tankers was entrusted to MAN B&W licensee Manises Diesel, a Spanish enterprise owned by Astilleros

Espanoles (AESA) and MAN B&W

Diesel. The selected prime mover, the

S50MC-C in its seven-cylinder version, is lighter and shorter than the preceding engine type, producing some 10 percent more power than the equivalent MC model. For each of the newbuilds at

Avondale, two such engines producing 15,015-bhp (11,060-kW) apiece will be delivered from Europe.

Circle 243 on Reader Service Card

The Renk friction clutch connecting the engine to the propeller and incorpo- rating an integrated thrust bearing is per- haps the most innovative element of the propulsion system. The clutch allows the screw to be engaged and disengaged with the engine running at low speed, and its admissible torque is twice the nominal torque of the engine.

Thus, with the propeller disconnected, the PTO can be employed up to the full 8,600 kW rating of the ABB shaft gen- erator for cargo handling purposes. The arrangements mean that the plant may be operated in a total of three modes, namely sea mode, maneuvering mode and cargo mode.

Look to Norway

With the impending delivery of the first of its new, state-of-the-art seismic survey ships, Houston-based Western

Atlas International has again tested the mettle of the maritime industrial infra- structure in western Norway. Ship and equipment quality and capability, and technological and operational input to design development conferring a com- petitive edge, are critical to the special- ists in the niche business of subsea seis- mic data gathering.

The remit for the sophisticated new breed from Ulstein Verft called for extremely high levels of productivity and efficiency, and unerring accuracy, in undertaking advanced, three-dimension- al seismic surveys in often hostile sea and weather conditions. The competi- tive market environment in which the vessels will operate is no less rigorous than the elements they will have to endure while deploying, trailing and recovering the multi-streamer arrays that now characterize the modern seis- mic ship. The pair of 298.5 ft. (91 m) newbuilds for Western Atlas, represent- ing a combined contract value of $91.6 million, is the product of close co-oper- ation between customer and shipbuild- ing contractor, with the latter having had first-line recourse to the design and equipment companies in the Ulstein group.

The latest ship is a new showcase for the west Norwegian maritime produc- tion sector, with her engineering and propulsion systems, steering, deck and specialized cable handling equipment, automation and design, developed and manufactured in the region. She thereby provides fresh testimony to the depth and width of the Norwegian maritime cluster, and to the integrated manner in which it can operate within a region or country given sufficient critical mass.

Good experience with six ships built by Ulstein Verft between 1991 and 1993 brought Western Atlas back to the coun- ty of More og Romsdal for its latest stage of fleet development. "Western requires that ships in their fleet operate efficiently, have low noise levels and can rapidly deploy and haul in the hydrophone cables. These demands are fulfilled by Ulstein vessels," said

Ulstein Verft's managing director Bryn- 12 Maritime Reporter/Engineering News

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