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Wärtsilä RT-flex96C & RTA96C - 24 Pages

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Catalogue excerpts

WÄRTSILÄ RT‑FLEX96C AND WÄRTSILÄ RTA96C TECHNOLOGY REVIEW

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WÄRTSILÄ RT‑FLEX96C AND WÄRTSILÄ RTA96C TECHNOLOGY REVIEW This is a brief guide to the technical features and benefits of Wärtsilä RT‑flex96C and RTA96C low‑speed marine diesel engines.

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1‑cylinder Wärtsilä RT‑flex96C engine giving 68,640 kW (9,60 bhp). INTRODUCTION The.Wärtsilä.RT‑flex96C.and.RTA96C.low­ speed.marine.diesel.engines,.with.a.power. range.of.24,000.to.80,080.kW,.are.tailor­ made.for.the.economic,.reliable.propulsion.of. large,.fast.container.liners..They.offer.clear,. substantial.benefits: • High.power.outputs.at.optimum.shaft. speeds • Reliability.and.proven.design • Competitive.first.cost • Economical.fuel.consumption.over.the. whole.operating.range • Low.cylinder.oil.feed.rate • Three.years.between.overhauls • Low.maintenance.costs 4 • Full.compliance.with.the.NOX.emission....

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Engine speed Principal parameters of Wärtsilä RT‑flex96C and RTA96C engines integrated.electronic.control.and.the.well­ established.RTA96C.engine. The.14‑cylinder.RT‑flex96C.engines.extend. the.power.spectrum.of.the.RTA.series.up.to. 80,800.kW.(108,920.bhp)..Thus.with.waste. heat.recovery.systems.which.can.add.up.to.12. per.cent.of.engine.power,.RT‑flex96C.engines. can.meet.the.propulsion.requirements.of.large,. fast.containerships.from.up.to.around.12,000. TEU.capacity.at.service.speeds.of.around.25. knots. * 1‑ and 14‑cylinder engines only in RT‑flex version.

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DEVELOPMENT BACKGROUND power.up.to.today’s.80,080.kW.(108,920. bhp)..The.increased.power.output.was.made. possible.by.the.very.satisfactory.service. experience.with.the.engines.in.service. Further.improvements.were.subsequently. achieved.by.the.introduction.of.various.design. measures.to.improve.piston‑running.behaviour.. These.improvements.reduce.wear.rates.of. cylinder.liners.and.piston.rings,.extend.times. between.overhauls.and.allow.reduced.cylinder. oil.feed.rates. A.major.step.forward.was.achieved.when. the.RTA96C.was.combined.with.the.RT‑flex. electronically‑controlled.common‑rail.technology....

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RT‑FLEX: CONCEPT AND BENEFITS The.Wärtsilä.RT‑flex.system.is.the.result.of.a. long.project.since.the.1980s.to.develop.low­ speed.marine.engines.without.the.constraints. imposed.by.mechanical.drive.of.fuel.injection. pumps.and.valve.actuation.pumps.but.with. far.greater.flexibility.in.engine.setting.to.reach. future.requirements..The.objective.is.to.deliver. operational.benefits.to.the.shipowners. The.Wärtsilä.RT‑flex96C.is.basically.a. standard.Wärtsilä.low‑speed.two‑stroke.marine. diesel.engine,.except.that,.instead.of.the.usual. camshaft.and.its.gear.drive,.fuel.injection.pumps,. exhaust.valve.actuator.pumps.and.reversing....

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Inside the rail unit of an RT‑flex96C engine during assembly. The exhaust valve actuator (A) is mounted on the servo oil rail and the injection control unit (B) is on the fuel rail. Next to the fuel rail is the smaller control oil rail (C) and the return pipe for servo and control oil (D). Exhaust valve actuator WECS control system Fuel injectors Various RT‑flex equipment on the lower platform of a 1RT‑flex96C engine. From left to right, these include (A) the local engine control panel, (B) the automatic fine filter for servo and control oil, (C) the two electrically‑driven control oil pumps and...

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RT‑FLEX: REAL IN‑SERVICE FUEL ECONOMY Whereas.Wärtsilä.RTA‑series.engines. have.excellent.fuel.consumption.in. general,.the.RT‑flex.system.enables.further. improvements.to.be.achieved.in.the.part­ load.range..This.is.because.of.the.freedom. allowed.by.the.RT‑flex.system.in.selecting. optimum.injection.pressure,.fuel.injection. timing.and.exhaust.valve.timing.at.all.engine. loads.or.speeds,.while.ensuring.efficient. combustion.at.all.times,.even.during.dead. slow.running. Similar.freedom.in.exhaust.valve. timing.allows.the.RT‑flex.system.to.keep. combustion.air.excess.high.by.earlier.valve. closing.as.the.load/speed.is.reduced..This.is....

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1‑cylinder Wärtsilä RTA96C engine giving 68,640 kW. Fuel injection pump with double control valves. RTA96C: THE TRADITIONAL CAMSHAFT ARRANGEMENT The.Wärtsilä.RTA96C.retains.the.traditional,. mechanical.camshaft.arrangement.for.fuel. injection.pumps.and.valve.drives. The.camshaft‑driven.fuel.injection.pumps. are.of.the.well‑proven.double‑valve.controlled. type.that.has.been.traditional.in.Wärtsilä.low­ speed.engines..Injection.timing.is.controlled. by.separate.suction.and.spill.valves.regulated. through.eccentrics.on.hydraulically‑actuated. lay.shafts..Consequently,.great.flexibility.in. . timing.is.possible.through.the.variable.fuel....

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Three views of principal elements in the engine structure: bedplate (top left), column (top right) and cylinder jacket (above). Finite‑element model of the engine structure for computer analysis comprising the ‘gondola’ type bedplate, welded box‑type columns and individual cast‑iron cylinder blocks. ENGINE STRUCTURE Wärtsilä.RT‑flex96C.and.RTA96C.engines.have. . a.well‑proven.type.of.structure,.with.a.‘gondola’­ type.bedplate.surmounted.by.very.rigid,.A­ shaped.double‑walled.columns.and.cylinder. blocks,.all.secured.by.pre‑tensioned.vertical.tie. rods..The.whole.structure.is.very.sturdy.with.low....

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Lowering the crankshaft into the bedplate. RUNNING GEAR The.running.gear.comprises.the.crankshaft,. connecting.rods,.pistons.and.piston.rods,. together.with.their.associated.bearings.and. piston.rod.glands. The.crankshaft.is.semi‑built.comprising. combined.crank.pin/web.elements.forged.from. a.solid.ingot.and.the.journal.pins.then.shrunk. into.the.crank.web. The.main.bearings.have.white.metal.shells.. The.main.bearing.caps.are.held.down.by.two. pairs.of.elastic.holding.down.studs. A.better.understanding.of.the.main.bearing. loads.is.obtained.with.today’s.finite‑element. analysis.and.elasto‑hydrodynamic.calculation....

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Piston, piston rod and gland box. Crosshead pins with guide shoes. Load diagrams for main bearing with and without crankshaft distortion taken Finite-element analysis of the crank throw of the RT-flex96C into account. under full dynamic loading.

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