Page 41: of Maritime Reporter Magazine (January 1989)

from one engine to the other, except in the cruising mode.

Either the "father" engine or the "son" engine has all the capacity or the capacity is distributed between the engines in proportion to their nominal capacity.

The speed step of the "son" is necessary to enable it to drive the heavy propeller alone, in spite of its low capacity and this also benefits the speed requirements mentioned earlier.

Resilient Mounting

Of Engines

Passenger vessels, such as the

Crown Odyssey, require a high level of comfort. Therefore, the struc- ture-borne noise of propulsion en- gines has to be isolated from the ship's hull. Elastic mounting of the engines offers an excellent solution to the problem of structure-borne noise.

Resilient mounting of ship diesel engines is not a new technique.

However, there is a difference be- tween the direct elastic installation of main propulsion engines and the mounting of aggregates where en- gine and generator are placed on a common frame and the spring ele- ments are arranged beneath the base frame. Aggregates have an ad- vantage in that they do not reflect the torque, relative to the elastic mounting, to the outside. The en- gine transmits its torque through the shaft connection to the genera- tor. Engine and generator support themselves on the same frame and generate an opposed reaction mom- entum which arrives at the frame as torsion and closes the circle of tor- sional momentum. The base frame therefore receives a certain torsion in the area between engine and gen- erator. With rigid design and pre- vention of resonances, this can be well controlled and negligible reac- tions will be generated at the ship's foundation beneath the spring ele- ments. Furthermore, aggregates generally run at a constant speed, which makes the design consider- ably easier. Finally, the higher spring-supported weight around the base frame, in contrast to direct mounting, is of considerable advan- tage.

The elastic mountings used aboard the Crown Odyssey were specially developed by Krupp MaK for the 140-ton 8 M601 engine. The mountings provide excellent vibra- tion and structure-borne noise insu- lation for the ship, while maintain- ing safe vibration levels for the en- gines and propulsion system. In ad- dition, the elastic mountings reduce strain on the engine frame and bed plate; limit engine motion due to heavy seas; and provide relatively easy cost-effective installation and maintenance.

It can be concluded that reliable engines can be adapted to meet the special requirements of passenger ships. The installation of several medium-speed engines, together with reduction gears and controlla- ble pitch propellers, as in the case of the Crown Odyssey, provide for high efficiency, high reliability and quiet operation.

For a free copy of the complete technical paper, "Reliable Econom- ic Propulsion Systems With High

Passenger Comfort," along with brochures and literature detailing the full line of diesel engines offered by Krupp MaK,

Circle 47 on Reader Service Card

MHI Wins Order

For LPG Carrier

Worth $50-Million

Japanese shipbuilder Mitsubishi

Heavy Industries (MHI) has won its third order this year for a large liquefied petroleum gas carrier. The order for a 78,000-cubic-meter-ca- pacity carrier, which will be man- aged by Sanko Steamship, was placed by Mitsubishi Corporation under a contract said to be worth about $50 million.

BE WHERE THE BUYERS ARE

IMEX-89

INTERNATIONAL MARINE EQUIMENT EXPOSITION

THE RIVERGATE / NEW ORLEANS APRIL 20-22, 1989

Here's 5 good reasons why you should be at IMEX 89 — The new show for workboat, passenger vessel and shallow-draft military buyers! 1BUYERS. Only IMEX gives exhibitors ex-clusive access to key buyers from the following major markets: oilfield service and supply; inland river transportation; passenger and specialty vessel operations; shallow-draft military buyers and specifiers; pollution control and clean-up.

Off,-cial Publi

KEPOr TER 2TIMING. Set for April, 1989, IMEX re-sponds perfectly to an industry on the upswing. No conflicts with other major shows - no "squeezing" IMEX into a busy holiday schedule. The industry will be "fitting out" and the weather will be fine. 3LOCATION. New Orleans and The Rivergate - A winning combination. At the hub of the oilfield and river industries, New Orleans has the appeal to draw buyers from all IMEX markets. Plus, it's a great town for exhibitors - vacation, entertain, do some business. Only at IMEX. 4PRICE. Exhibit space at IMEX is moder-ately prices at $775 per standard 10x10 booth (well below comparable shows). Plus, IMEX exhibitors can save even more when they take advantage of generous early bird discounts. IMEX - The affordable show.

CALL OR FAX SHOW OFFICES TODAY

FOR MORE IMEX 89 INFORMATION:

PHONE: 207/348-9990 FAX: 207/367-2490 5RESULTS. Sales and qualified sales leads. That's all that really matters, the rest is just window dressing. No where else in the next 12 months will you find a more effective and affordable obbortunity to produce sales results. Let IMEX be your top producing salesman in '89.

MAIL TO:

IMEX 89, P.O. Box 274, Deer Isle, ME 04627 r • YES, Send me more information about IMEX 89 • EXHIBITOR INFO • ATTENDEE PACKAGE

NAME

COMPANY

ADDRESS

CITY ST ZIP

PHONE FAX

Circle 212 on Reader Service Card

January, 1989 45