The reliable driving force

Output kW

80 000

60 000

50 000

40 000

30 000

20 000

10 000

8 000

6 000

4 000

rev/min

Output bhp

100 000

80 000

60 000

40 000

20 000

10 000

8 000

6 000

60 70 80 90 100 120 140

Engine speed

RTA72U-B

RTA52U-BRTA84T-D

RTA68T-B

RTA58T-B

RTA48T-B

RTA96C

RTA84C

RTA62U-B

RTA60C

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Workhorses across the oceans

Two-stroke diesel engines are the optimum prime movers for most ocean-going cargo shipstoday and in the future. With relatively few cylinders directly driving a single propeller, thetwo-stroke engine plant offers simple and reliable propulsion. Easy operation andmaintenance are thus strong features.

Today’s SULZER® RTA low-speed diesel engines have been developed over the past 20years to give a rational series of reliable engines which optimally fit modern ship designs.They cater for all types of cargo ships in the power range of 5100 to 80,080 kW(7000–109,000 bhp) and are the robust ‘workhorses’ to power your ocean-going ships fortheir entire working lives.

The well-proven benefits of Sulzer RTA-series engines are wide-ranging, including:� Superior reliability for trouble-free operation with minimum off-hire time;� Long times between overhauls, with three years between piston withdrawals on

low-quality heavy fuels;� Easy to operate and maintain;� Low fuel consumption on all usual grades of heavy fuel bunkers;� Low cylinder oil feed rate;� Low ancillary power requirements for engine

systems;� Full compliance with the IMO NOX emissions

regulation;� Optimum ‘fit’ to ships’ propulsion needs, with

overlapping layout fields giving freedom inchoice of power and revolutions;

� Simple installation;� Compact dimensions and competitive weight;� Comprehensive after-sales support through

global service network.

Yet research and development continues. The current focus is on emissions, reliability andquality. Sulzer RTA engines comply fully with the IMO NOX emissions limit in Annex VIto the MARPOL 73/78 convention. Technologies such as direct water injection are underdevelopment to reach still lower emissions levels. The Sulzer RT-flex system of common-railfuel injection which first entered production in the year 2000 also gives emissions benefits –smokeless operation – as well as a mechanically simpler engine. Advances are also being madein piston-running behaviour to reach longer times between overhauls and allow lowercylinder oil feed rates.

When specifying the engine for your next newbuilding, you need an engine you cantrust. You find this trust when it carries the Sulzer brand name – the famous brand forlow-speed marine diesel engines.

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‘Fit’ To The Ship

A holistic approach is taken to each new Sulzer RTA engine design. Primeconsideration is given to all aspects of the requirements of the engine’s usersand its application, with highlights being:� ‘Fit’ to power and revolutions: Broad, overlapping layout fields of engine

types give the ship design ample freedom to select the best combination ofpower, revolutions and number of cylinders to suit any newbuildingproject.

� ‘Fit’ in the engine room: Minimum dimensions to keep engine room shortand maximise payload.

� Simpler installation: Simple seating arrangements with relatively fewerholding down bolts, fewer side stoppers, and less chocking materialneeded. No end stoppers are needed as thrust transmission is integrated inthe bolting. Side stays and drains are also simpler.

� Less electrical power demand for all ancillary services, including auxiliaryblowers, cooling water, lubricating oil, fuel supply, etc.

� High exhaust gas temperature for greater steam production.� Comprehensive guidelines for the installation – cooling water, lubricating

oil, control air, drains, engine management systems, foundations,alignment, vibration analysis, etc.

This approach is also the opening to The Ship Power Supplier conceptfollowed by Wärtsilä Corporation. Under this concept, when RTA enginesare to be delivered by Wärtsilä, the scope of supply can be extended toinclude the propeller, shafting, shaft bearings, diesel generating sets,PTO/PTI system, selective catalyst reactor units (if full NOX reduction isneeded), and all related engineering and supervision according to customers’requirements.

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Sulzer 10RTA96C

Sulzer 6RTA68T-B

The reliability thatkeeps your ships earning

Reliability is a key quality of any ship propulsion machinery. Ships usually have to keep to setschedules or agreed arrival dates set by charterers. Failure to do so can be costly to shipowners. Furthermore, unplanned off-hire time leads to lost revenue as well as additionalcosts.

Thus, ships’ engines are expected to run continuously, or as the owner wishes, withoutany unplanned stoppages from one planned overhaul to the next.

This is the normal expectation for Sulzer RTA engines. Times between overhauls arenow usually two years. However, engines built to the latest design standard, including theTriboPack package for improved piston-running behaviour, are fully expected to extend theoverhaul intervals safely to three years.

The reliability of modern Sulzer low-speed marine engines has been reached bycontinuous investment in research, by using the latest computer-based design tools, and by

employing proven design concepts. Engine designis supported by full-scale engine tests, and byinvestigations undertaken on board ships undernormal service conditions.

At the same time, the engines need to bemanufactured to give the necessary quality fortrouble-free operation. This is fully recognised atWärtsilä and our licensees. Manufacturing is wellorganised at the licensees. Most of them haveimplemented, or are implementing Total QualityManagement (TQM) and also ISO 9002 qualitysystems. These also mean that the quality systemsof suppliers are audited by the licensees, just aslicensees’ quality systems are audited by Wärtsilä.

Training also has an influence on reliability.For this reason, courses are available for training ships’ engineers in the operation andmaintenance of Sulzer RTA engines.

Thus all aspects are taken into consideration to provide owners with engines having thereliability necessary for their business.

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The details which make the difference

Our design philosophy is for Sulzer RTA engines to be as simple and reliable, compact andlight as possible.

Since the Sulzer RTA series was introduced in 1982, it has continually been updatedand extended.

Yet Sulzer RTA engines also incorporate the latest marine diesel engine technology tomeet your needs. Some of the key features in RTA engines which make the difference overthe operating life of the engines are:� Nimonic exhaust valves for longest life times;� Valve-controlled injection pumps for precise injection timing over long life, and lowest

possible minimum revolutions;� All bore-cooled combustion chamber components for low temperatures, stresses and

strains, hence long life;

� Variable injection timing for excellent part-load fuel consumption;� Camshaft driven by gear wheels for long-term stability in timing;� Multilevel cylinder lubrication for best distribution of oil.

Piston-running behaviour largely determines the times between overhauls. For this reason,Wärtsilä has introduced the TriboPack package of design improvements. It will enable RTAengines to reach longer times between overhauls with greater certainty, and low cylinder oilfeed rates. The main elements of TriboPack are:� Ideal running surface on the cylinder liner, after deep honing;� Cleaning of carbon deposits from piston top land by anti-polishing ring at top of liner;� Appropriate temperature distribution on the liner surface;� Optimum feeding and distribution of cylinder lubricating oil;� Chromium-ceramic top piston rings, pre-profiled;� Effective removal of water carryover from scavenge air cooler.

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Research & development— one step ahead

Considerable progress has been achieved over the past years withSulzer low-speed engines. They have continually been improved –achieving lower fuel consumption, becoming more compact yet morepowerful, reaching far longer times between overhauls, and havingsignificantly lower first costs and lower emissions according to legalrequirements.

This progress is largely due to the efforts applied in research anddevelopment, which is charged with duties to:� Generate new ideas in diesel technology;� Keep up to date with latest technological developments;� Seek better ways to meet the needs of shipowners, shipbuilders and

licensed enginebuilders – in terms of reliability, longer timesbetween overhauls, fuel efficiency, emissions control and lowerengine first cost;

� Develop new tools for better analysis and calculation of the manyparameters in modern diesel engines;

� Investigate new developments both on the research engine, onproduction engine tests and at sea in long-term field trials.

The philosophy for Sulzer diesel engines is to test concepts andcomponents to parameter levels far beyond current market needs toexplore their technological potential and viability, then to implementthe most suitable design features in a suitable way to well-provenproduction engines while keeping within the test parameter limits.

The heart of our research and development activities is the DieselTechnology Center in Winterthur, Switzerland. It is furnished with afull-size low-speed research engine, operating with the Sulzer RT-flexcommon rail system. The test bed is supported by advanced test rigsand other research tools, and direct, computer-based data acquisitionand processing. The engine can also be run on any grade of heavy fueloil.

The Diesel Technology Center is equipped with the latestequipment for exhaust gas treatment. Not only does this meet thelocal environmental protection requirements, but it also providesexcellent facilities to find better methods for emissions control.

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Sulzer 6RT-flex58T-Bat official shop test

At the heart of theRT-flex system arequick-acting Sulzerrail valves

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Common Rail forsmokeless operation

The latest major step in marine diesel engines has been the introduction ofcommon-rail technology with the application of the Sulzer RT-flex systemto RTA-series engines. It gives a mechanically simpler engine with smokelessoperation at all loads, less emissions in general, lower part-load fuelconsumption, and greater flexibility in operation, such as for slower “slowsteaming”. The engines are fully electronically controlled, and there is noneed for the camshaft and its individual fuel injection pumps andvalve-actuating pumps.

The first RT-flex engine, a 6RT-flex58T-B, successfully completed itsofficial shop test in January 2001. Additional RT-flex engines, of the SulzerRT-flex60C type, are on order. The RT-flex system will later be applied toall engine types in the RTA programme.

The RT-flex concept brings common-rail fuel injection to the modern,large diesel engine. Current jerk-type fuel injection systems combinepressure generation, timing and metering in the injection pump with onlylimited flexibility to influence the variables. In contrast, the Sulzer CommonRail separates the functions and gives far more flexibility for optimising thecombustion process with injection and valve timing.

Fuel is delivered by high-efficiency pumps to the Common Rail at theusual high pressure ready for injection. From the Common Rail, the fuelpasses through the injection control unit to the standard fuel injectionvalves. The control unit for each engine cylinder regulates the timing of fuelinjection, provides precise control of the volume of fuel injected, and setsthe shape of the injection pattern. The three fuel injection valves in therespective cylinder cover are independently controlled so that they may beprogrammed to operate separately or in unison as necessary. The CommonRail system is purpose-designed for the same heavy fuel oils as with SulzerRTA engines.

Thus the RT-flex brings the common rail right up to date with fullelectronic control, high-efficiency pumps and quick-acting rail valves, allcombined together for top-class performance. An additional common-railsystem provides hydraulic actuation of the exhaust valves. Electronic controlis also applied to the starting air system.

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A complete service solution for your Marine Power System:Service agreementsField servicesTechnical supportTrainingTechnical information & software systemsWorkshop & ship repair servicesParts, tools & consumablesUpgrading packages, modernisation

Lifelong support

When you invest in a Sulzer RTA engine, it includes comprehensiveafter-sales service throughout the ship’s life to ensure that you get theoperating economy and reliability for which the engines are built.

Of course, genuine, high-quality parts are available from Wärtsiläround the clock, 365 days a year, through our global service network.With professional logistics, we will meet all your delivery requirements.

Yet service is more than parts delivery. It involves being availableanytime and from anywhere to answer your technical queries, and to havea team of experienced service engineers to come to your assistance.

They can provide any type of service from commissioning and seatrials to maintenance and management support, inspections andtroubleshooting. The expertise of the service engineers is also backed bytheir direct access to the engine designers’ knowledge base.

Wärtsilä can also be your Total Service Provider. Custom-tailoredservice agreements cover whatever extent of services you require, from partssupply to operation and maintenance. Such service agreements extend TheShip Power Supplier concept to the whole life of the plant and will – inclose partnership with you – help to optimise the profitability of yourinitial investment.

To enable efficient and easy processes, Wärtsilä is developing itsweb-based on-line services. These electronic services include on-line spareparts ordering, interactive technical documentation, technical support ande-learning.

You can also take advantage of the ongoing technical development ofSulzer RTA engines. Where appropriate, spare parts can be supplied to thelatest design standard for improved performance and longer life. Moreextensive improvements to your engine may be obtained throughupgrading packages, particularly for better piston-running behaviour,longer times between overhauls, emissions control on many levels,operational safety and efficiency, etc.

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Wärtsilä CorporationP.O.Box 196FIN-00531 Helsinki, Finland

Tel: +358 10 709 0000Fax: +358 10 709 5700

Wärtsilä is The Ship Power Supplier for builders, owners and operators

of vessels and offshore installations. We are the only company with a

global service network to take complete care of customers’ ship

machinery at every lifecycle stage.

Wärtsilä is a leading provider of power plants, operation and lifetime

care services in decentralized power generation.

The Wärtsilä Group includes Imatra Steel, which specializes in special

engineering steels.

For more information visit www.wartsila.com

WÄRTSILÄ® and SULZER® are registered trademarks. Copyright © 2004 Wärtsilä Corporation.