Dengeleyici finler


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Dengeleyici finler

  1. 1. Set a course for optimum reliability and performance steering and stabilisationRolls-Royce plcCommercial MarinePO Box 160, NO-6065 Ulsteinvik, NorwayTel. +47 70 01 40 00Fax +47 70 01 40 05Naval MarinePO Box 31 Fishponds, Bristol BS16 1XY, EnglandTel. +44 117 974 8500Fax +44 117 979
  2. 2. Moving your business The best in technology and system solutionstowards higher profitability Steering and stabilisationRolls-Royce is one of the largest internationalsuppliers of marine technology, products andsystems. Our design principles are always focusedon the future operation and service needs ofmodern, high-tech vessels which demand the bestproducts available on the market.Our vast expertise in marine technology and longtraditions of working closely with customersenables us to supply a full range of motion controlproducts and systems. Internationally acclaimedproducts such as Tenfjord and Frydenbö steeringgear, Ulstein Hinze rudders, Brown Brothers fin The state-of-the-art hydrodynamic test needs of individual vessels. Being a single source supplierstabilisers and Intering stabilisation systems. centre in Sweden allows Rolls-Royce However, credit for these products simplifies product and system to set standards for steering and must be given to our customers. They integration on board. Well-integratedMany of these products have operational lives of The hydrodynamic test centre in Sweden is equipped with two stabilisation products. The centres have shared their hard-earned system solutions minimise running25 years or more.We are therefore committed to cavitation tunnels, enabling us to optimise manoeuvring equipment premium hydrodynamic environment experience and helped refine products costs and technical risk, as well as on any type of vessel. boosts expertise, especially with its to excellence by working closely with maximising a vessels performance.provide services that ensure cost efficient and two cavitation tunnels. These allow us our marine engineers. Close Furthermore, customers have a singlereliable operation beyond tomorrow. to study the complex interaction collaboration with customers on a point of contact and receive full between rudders, propellers and hulls project is therefore a key element service from Rolls-Royce all the wayWith a truly international presence with fully in depth, leading to solutions that within the Rolls-Royce range of from the initial conceptual design of aqualified local service engineers and technicians, meet customer demand for reliability, products. vessel and selection of equipment toRolls-Royce provides an unequalled global marine cost-efficiency and optimal in-service support and flexiblecapability. A capability to move your business Contents: performance – tailored to meet the financing.towards higher profitability. Steering gear pages 4 - 9World famous motion control product names Rudders pages 10-13supplied by Rolls-Royce: Fin stabilisers pages 14-17 Stabilisation systems pages 18-21Brown Brothers™ Customer support pages 22-23Frydenbö™Ulstein Hinze™Intering™Tenfjord™ The flap on the Ulstein Hinze flap rudders gives excellent Scaled down models are tested to ensure optimum integration manoeuvrability. between the rudder, propeller and hull (HSVA).2 3
  3. 3. Tenfjord™rotary vanesteering gear Tenfjord SR series steering gears The pump utilises a reversible gear, and enables a precise analogue Steering gear The Tenfjord SR series is suitable for hydraulic pump motor together with control system. The pump engines are small to medium-sized vessels. The a frequency converter for changing mounted directly on the rudder steering gear is designed with the speed and the direction of the actuator, which lessens the need for integrated frequency controlled pump. The design gives smooth piping work on board a vessel. pumps. starting and stopping of the steering Typical applications: Suitable for vessels such as: • Work boats • Fishing vessels • Offshore supply vessels • Smaller cargo vessels • Smaller passenger vessels • Yachts The Tenfjord SR series is designed with integrated frequency General description rotary vane controlled pumps. steering gear Unique technical solutions minimize The pump engines are mounted Rolls-Royce supplies a complete The rotary vane principle also ensures noise and vibration levels. directly on the rudder actuator. range of steering gear, suitable for all a constant torque throughout the sizes of ships. The products are steering sequence, providing the gear designed with the totality of actuator, with maximum power output. The Benefits of the SR series power pack, steering control and unique technical solutions ensure very • Low noise level alarm system in mind. Due to a wide low noise and vibration levels. • Low power consumption range of demands, great care has been • Low heat generation taken from material selection through The compact and simple design • Excellent positioning construction in order to meet the reduces weight and secures fast and precision strictest quality demands. easy installation of the steering gear. Rolls-Royce Tenfjord and Frydenbö The actuators are mounted directly on Key Product Benefits series of rotary vane steering gears the rudder stock, without necessary • Compact have been manufactured for more use of keys or keyways, facilitating • Low weight Red indicates pressurised oil. The compact and simple design lessens the than 50 years, with more than 25 000 easier assembly and dismantling of Green indicates excess oil. weight and is quick and easy to install. • Easy installation SR range machines delivered. The principle of a the rudder stock. The rudder torque is • Easy maintenance Max. Max. Weight Max. Max. rotary vane gives more flexibility transmitted by hydraulic coupling or Max.stock working rudder approx. radial axial • High positioning accuracy TYPE dia. (mm) torque (kNm) angle kg load (kN) load (kN) when choosing the design and types by expansion rings (for the smallest • No external moving parts o SR 562L-FCP 140 16 2 x 61.0 400 175 104 of rudder, thanks to the rudder angles machines). The Brown Brothers rotary • Up to 70 rudder angle SR 562-FCP 160 40 2 x 61.0 400 175 104 of up to 2 x 70º. Rotary vane steering vane steering gear range is designed • Available with steering control SR 622-FCP 200 70 2 x 72.0 620 400 200 gear does make navigation through for naval applications and meets the and rudder angle indicators as SR 642-FCP 240 110 2 x 72.0 920 600 250 narrow straits safer, because of the highest standards for noise, shock one complete system SR 662-FCP 280 170 2 x 72.0 1800 700 354 vessels increased manoeuvrability and vibration. • Built-in rudder carrier SR 722-FCP 340 275 2 x 74.0 2750 855 370 and improved control when docking. • Polymer sealings internally for SR 723-FCP 340 412 2 x 44.0 2800 855 370 optimal tightness SR 742-FCP 395 433 2 x 74.0 3700 1240 480 • Simple and robust components SR 743-FCP 395 650 2 x 44.0 3800 1240 480 All rights reserved. Data subject to change without prior notice.4 5
  4. 4. Frydenbö™ rotary vanesteering gear Frydenbö RV series steering gear Steering gearThe Frydenbö steering gear has aproven service record on all types of Typicalvessels. Today’s range is suitable for applications: • Oil tankersmedium-sized to large ships, • Ro-Pax vesselsincluding large container vessels and • Container vesselsVLCCs. The weight is typically 50- • Bulkers • Cruise vessels60% of a RAM-type steering gear, • LNG-tankerswith much smaller space requirement. The Frydenbö RV and IRV series areFurthermore, the Frydenbö design’s suitable for medium-sized to large vessels.dual, submerged pump power packs The Frydenbö 4-vane steering gear is a The Frydenbö IRV series is renowned for itsmakes installation even easier, as no further development of the well proven simplicity, robustness and reliability, andexpansion tank is needed. Installation Frydenbö range of steering gears with two satisfies all requirements for tankers overis also simpler because of the and three vanes. 100,000dwt. Frydenbö IRV series steering gear statutory requirements for tankersintegrated storage tank and rudder IMO regulations require compliance over 100,000dwt. This range also Max. Max. Weight Max. Max.carrier. Max. stock working rudder approx. radial axial with the principle of single failure incorporates Frydenbö’s proven and TYPE dia. (mm) torque (kNm) angle kg load (kN) load (kN)The Frydenbö Modulated Flow criteria for large tankers over 100,000 unique modulated flow control valve. RV rangeControl modulates the oil flow to the dwt. This requirement is met by the RV 550-2 370 568 2 x 71.5 3500 1400 500actuator in order to give a soft start IRV series, which incorporates Frydenbö Unitized steering gear RV 700-2 410 677 2 x 71.5 5000 1800 700and low rudder speed for small automatic isolation of the actuators The Frydenbö Unitized steering gear RV 850-3 420 853 2 x 46.5 3700 1400 500rudder movements. The oil flow dual hydraulic system. The actuator is is an application of the RV and IRV RV 900-2 450 874 2 x 71.5 6000 1800 700 equipped with a double sealing ranges that combines actuators, RV 1050-3 450 1015 2 x 46.5 5000 1800 700gradually increases to full flow, RV 1100-2 510 1094 2 x 71.5 8000 3000 1250allowing full turning speed on the system, completely separating the power packs, storage tanks and RV 1350-3 495 1312 2 x 46.5 6000 1800 700rudder. The system ensures a very actuator in two individual pressure foundations on a single, compact skid. RV 1400-2 500 1412 2 x 71.5 8100 1800 700precise rudder positioning at small chambers. In addition, the specially- This design can handle most RV 1650-3 550 1641 2 x 46.5 8000 3000 1250rudder angles during course keeping, designed sensor system maintains preparatory and work tasks related to RV 1700-2 560 1708 2 x 71.5 11000 3000 1250while the full flow ensures full constant control of the integrity of the steering gear installations on board. RV 2050-2 580 2028 2 x 71,5 12000 3000 1250manoeuvring capability when seals. This cuts labour costs, minimises risk RV 2600-3 620 2563 2 x 46.5 11500 3000 1250needed. and helps ensure punctual RV 2700-2 650 2666 2 x 71.5 15000 3000 1250 Frydenbö 4-vane steering gear installation. RV 3050-3 660 3043 2 x 46.5 12000 3000 1250Product benefits: This is a range of extremely compact RV 4000-3 700 4000 2 x 46.5 15000 3000 1250• Modulated flow control rotary vane steering gear, which is RV 3050-2 700 3050 2 x 71.5 20000 3000 1800• Integrated oil storage tank suitable for large vessels including RV 4200-2 730 4200 2 x 71.5 24000 3000 1800• No expansion tank required tankers over 100,000 dwt. The 4-vane 4-vane• High levels of positioning precision steering gear is a further development RV 4500-4 850 4500 2 x 36.5 22000 3000 4500 of the well proven Frydenbö range of RV 6000-4 850 6000 2 x 36.5 26000 3000 4500 IRV range steering gear with two and three IRV 2050-2 580 2028 2 x 71.5 12000 3000 1250 vanes. The key advantages of this IRV 2700-2 650 2666 2 x 71.5 15000 3000 1250 design is its compact size because of IRV 3050-2 700 3050 2 x 71.5 20000 3000 1800 the four vanes and its light weight as IRV 4200-2 730 4200 2 x 71.5 24000 3000 1800 well. The 4-vane steering gear is IRV 4500-4 850 4500 2 x 36.5 22000 3000 4500 available as the standard model as well IRV 6000-4 850 6000 2 x 36.5 26000 3000 45006 as the IRV model, which satisfies all Modulated flow control. All rights reserved. All data subject to change without prior notice. 7
  5. 5. Brown Brothers™ Brown Brothers™naval rotary vane actuator type ofsteering gear steering gear Steering gear Actuator steering gear has been selected for the Royal Navy Type 45 destroyers currently under construction. Brown Brothers rotary vane steering gear.Brown Brothers steering gear systems number of applications deployed in angle of a rotary vane unit is 37 o The Brown Brothers actuator gears is If problems occur with the hydraulicwith digital controls and autopilot naval fleets. to one side, although gears can be a cost-effective and reliable solution. driving mechanism, replacing anhave been selected by a large number supplied to give maximum working The gear is made redundant on a actuator is easier than a rotary vane orof the worlds navies including the Rotary vane steering gear o o angles of 70 and 90 to one side. single rudder by means of two Typical a ram type of steering gear.USA, Malaysia, India, Australia, The compact size of the rotary vane actuator systems. For example, one applications: • CorvettesSpain, Taiwan and the British Royal steering gear facilitates ease of fitting 17 model range available for torques actuator can be bypassed away from • Frigates Hydraulic power unitsNavy. The range has been developed to single or multiple-rudder from 2-256Tm. the system, and still provide around • Destroyers • Can be configured to meet specificto integrate seamlessly with the vast installations. The standard working 50% torque. • Helicopter carriers customer requirements • Variable or fixed displacement Furthermore, use of the actuator type pumps means fewer interface surfaces on • Pressure compensated or board because the actuators anchor proportional systems brackets can be welded directly on to • Dual or single power units the hull cartridge.This means that • Inherent safety and reliability Typical actuator steering gear is less applications: tolerance-critical for installation. • Corvettes • Frigates • Destroyers • Aircraft carriers The range has been developed to suit The rotary vane steering gear is specifically The steering gear is available with many different types of naval vessels. designed to conform with international pressure-compensated or proportional naval standards for noise, shock and systems.8 9 vibration.
  6. 6. Ulstein Hinze™ conventionalrudders, type classic General description rudders Rolls-Royce is a supplier of rudders as well as propellers. We can therefore draw on our Typical long experience and know-how applications: in the field of cavitation • Passenger vessels prediction, as this can occur and • Cargo vessels damage rudders and propellers. • High-speed crafts Advanced calculation programs ensure optimal propulsive Rudders efficiency and manoeuvring performance. The directional stability of ships in transit must be considered when designing the rudder. We The CB rudder for lower speed. A bulbous The CM rudder for medium speed. Medium The CS rudder for higher speed. Slim profile develop and use advanced profile and large vane end-plates improves profile optimises the proportion between increases overall propulsive efficiency and computer programs to simulate manoeuvrability at low speed. Heel module manoeuvrability and propulsive efficiency. reduces cavitation risk. Tapered blade, different manoeuvres such as optional. Ulstein Hinze CB has the same Tapered or rectangular blade. rounded corners and smooth surface. profile as FB, but without the flap. Ulstein Hinze CM has the same profile as Ulstein Hinze CS has the same profile as FS, the IMO criteria (e.g. zig-zag FM, but without a flap. but without a flap. test). The software uses the "Rudder Periodic Table" in principle actual hull shape to calculate the hydrodynamic hull forces. With this software we can evaluate different rudder sizes and types to optimise the rudder design FB rudder for each vessel. Flap rudder with The illustration visualises the bulbous profile hydrodynamics for classic rudders. Increased manoeuvrability Requirements for good FM rudder manoeuvrability at low speed Flap rudder with often governs a rudders design. medium profile The Ulstein Hinze conventional Available options: FS rudder Extensive testing of model Flap rudder with rudders, type classic are the result of • Trunk module with steering gear slim profile vessels has been carried out in years of experience in ship design and foundation collaboration with leading CB rudder hydrodynamics. You can rest assured • Automatic lubrication system Classic rudder with European test centres, in order bulbous profile of our guaranteed optimal reliability, • Special bearings/liners to optimise and document the excellent manoeuvrability and low • Heel connection module CM rudder manoeuvring properties of our Classic rudder with lifecycle costs. medium profile rudders at low speed. CS rudder Product benefits: Classic rudder with slim profile The different rudders are built as full • Easy installation Rolls-Royce offers a range of Estimated equal rudder area Increased propulsive efficiency spade rudders with 3 different • Easy maintenance rudders to meet customer standard profiles to ensure optimal • Custom-built to fit hull requirements – both with and The rudder design is also important for overall propulsive efficiency. It is a compromise: if a rudder is optimized for propulsive efficiency, you will loose manoeuvrability (especially at manoeuvrability for the various types • Optimal performance without flap. low speed) and vice versa. This is why a good understanding of shipowners requirements of vessel. • Suits all steering gear is vital when designing rudders. Lift curve for type classic.10 11
  7. 7. Ulstein Hinze™flap ruddersRolls-Royce has developed and builtflap rudders since 1985. Theperformance of a flap rudder isdetermined both by the flap, the linkmechanism and the profile, as well asthe hull and propeller. Rolls-Roycehas therefore designed a range of flaprudders to cover different types ofvessels and functions, in order tomake sure that customers receive a Ruddersrudder best suited to their vessels andoperations.Ulstein Hinze FB has a bulbousprofile for maximum manoeuvring Typical applications:performance, suitable at low to Ulstein Hinze FB rudders:medium speed. This rudder also has • Offshore supply vessels • Fishing vesselslarge upper and lower vane plates. It • Seismic vesselsis ideal for use on workboats, fishing • Cargo vesselsvessels and offshore vessels, as well Ulstein Hinze Ulstein Hinze FS. Ulstein Hinze FM/FS FB/ on small tankers, cargo vessels, rudders:ferries and other coastal vessels. • Passenger vessels • Cargo vessels • High-speed craftUlstein Hinze FM has a moderateprofile for enhanced manoeuvrability,suitable at medium speed. Therudder is suited to vessels up to20,000 dwt with high demand formanoeuvrability. Available options: • Trunk module with steering gearUlstein Hinze FS has a slim profile, foundationsuitable at medium to high speed. • Automatic lubrication systemThe rudder is built around a cast cone • Special bearings/linersmodule, and has a strong link • Heel connection modulemechanism and hinge system to Product benefits:withstand high forces. Used for • Superior steering abilitiesRo-Ro, Ro-Pax, passenger and cruise • Minimum installation timevessels and tankers, but it is also an • High reliabilityall-round flap rudder suitable for all • Custom-built to fit hull Conical hydraulic connection and Conical hydraulic connection with a The illustration visualises the Lift curve for flap rudders.types of vessels up to approx. • Suits all types of steering gear double sealing system. cast module for reinforcement. hydrodynamics for flap rudders.50,000 dwt. Double sealing system.12 13
  8. 8. Brown Brothers™folding-finstabilisers Aquarius can boast terrific The Neptune II folding-fin stabiliser performance, thanks Typical applications: stabiliser provides optimal to its one-piece, high-lift fin. • Large motor yachts vessel performance at low • Small cruise ships ownership costs. •Passenger ferries • Small naval and coast- guard vessels Aquarius folding-fin stabilisers Product benefits: Neptune II folding-fin stabilisers cylinder and seal maintenance Product benefits: General description fin stabilisers The Brown Brothers Aquarius • Enhanced stabiliser performance The one-piece fin is built of fabricated without dry docking, simplified crux • Enhanced stabiliser performance Rolls-Royce fin stabiliser systems use one or more pairs of hydrofoil folding-fin stabiliser range gives thanks to the one-piece high-lift fin materials, with a modified NACA assembly, improved hydraulic and due to one-piece, high-lift fin shaped fins projecting from a high-performance roll damping, with • Low installation costs for hydraulic, (North American Committee on lubrication systems, lower weight and • Ease of integration with ship’s vessel’s bilge area. Vessel speeds, a compact, lightweight design and mechanical and control equipment Aeronautics) section to maximise lift a new fin extension-locking alarm and monitoring system and the angle of the fins in the • Ease of integration with ship’s mechanism for improved safety. • Small hull aperture state-of-the-art controls. The fin properties and minimise drag, with a water, determine the extent of operating mechanism is especially alarm and monitoring systems similar effect as flapped fins. Neptune II offers optimal vessel • Modular construction Stabilisers generated lift, either up or down. The stabiliser control system senses configured to meet the requirements • Small hull aperture performance with low ownership • Simplified main seal replacement the degree of ship movement, and of smaller vessels, with minimum • Linear actuators for fin tilt and Features include an innovative tilt costs. • Load sensing hydraulics signals the stabiliser hydraulics to extension • Latest generation controls size, weight and number of parts. The ram attribute, which facilitates alter the angle of the fins to return stabiliser comes supplied complete • Integral lubrication system the vessel to an even keel. The result is usually an 80 - 90% reduction in with a fin-box and any necessary local • Fin-box can be shipyard supplied roll when compared with an stiffening, ready for the shipyard to • Load sensing hydraulics un-stabilised vessel. weld into place. • Latest generation controls The Brown Brothers Neptune and Aquarius folding-fin stabilisers, both incorporate a one-piece fin construction, with a “fishtail“ high-lift profile. When not in use, Technical data, Aquarius folding-fin stabilisers Technical data, Neptune folding-fin stabilisers Typical the fins are folded into recesses in Aquarius Fin area Total weight applications: Neptune Fin area Total weight model (m2) (tonnes) model (m2) (tonnes) the hull, flush with the vessel’s side. • Cruise ships 50 1.82 19.3 • Ferries 100 4.2 – 5.8 36.5 – 42 For applications where retraction of • Container vessels 2.42 19.8 200 5.45 – 7. 48 44 – 52 the fin is not required, the Modular 3.03 20.3 Medium to large naval 300 7.0 – 9.62 67.5 – 78.1 range is available for naval 3.51 20.8 vessels: 400 9.42 – 12.95 90 – 102.5 applications and the Gemini range 100 4.21 35.5 • Landing ships 500 12.5 – 17.19 127 – 142 for smaller commercial vessels • Helicopter carriers where high performance and low 4.73 37 600 16.24 – 22. 33 173 – 190 • Auxiliary platforms costs are important factors. 5.26 39 All data subject to change without prior notice. Brown Brothers Aquarius folding-fin stabiliser range is specially configured 5.78 40.2 for smaller vessels. All data subject to change without prior notice. Neptune II gives small hull aperture.14 15
  9. 9. Brown Brothers™non-retractablestabilisersThe Gemini range of Brown Brothers modularnon-retractable stabilisers stabilisers meet militaryare suited to small, standards for noise, shockcommercial vessels. and vibration levels. Gemini non-retractable stabilisers profile fins depending on the away in the power unit for easy Brown Brothers Modular stabilisers cavitation. If required, air emission replacement of the main sea glandFor applications where retraction of application. Gemini stabilisers installation. The Brown Brothers Modular from the leading edge of the fin can packing at sea.the fin is not required, the Gemini provide high performance roll non-retractable stabilisers incorporate also be utilised to minimise noise damping, as well as a compact, Product benefits: induced by cavitation. Product benefits:range is available for smaller superior hydrodynamic features, and lightweight design and modern • Enhanced stabiliser performance • Self-aligning bearingscommercial vessels where high fully satisfy military standards for due to high-lift fin The hull-closing plate is an integral • Special finshaft coatingperformance and low cost are controls, as well as proving highly noise, shock and vibration levels. Stabilisers • Compact power unit containing all part of the fin unit. Installation is easy, • Simple installation procedureimportant factors. dependable with low maintenance the hydraulic, mechanical and The latest finshaft coatings and as the unit is shaped to fit the hull • Fully satisfies military standards for costs. The power unit is compact, control equipment reduced-friction, long-life bearings are lines exactly, so expensive seating noise, shock and vibration levelsThe Brown Brothers Gemini range of incorporating pump, motor, • Ease of integration with ship used throughout the design to ensure structures and finishing work can be • Fin-size tailored in consistence withnon-retractable stabilisers can be proportional control valves and systems avoided. Maintenance costs are also the design and performance ofsupplied with a plain or high-lift cooler. All items required are packed long service. A keyless taper socket fin attachment allows the hydrodynamic significantly lower because of the individual ships. profile of the fin blade to remain simplified design with the option of Technical data, Modular range unbroken, reducing the potential for using an inflatable seal to enable Model Fin area Design speed Weight (m2) (knots) (tonnes) NR17 0.8 30 3 1.5 19 3.5 Technical data, Gemini folding-fin stabilisers NR22 1.9 30 6.8 Typical Gemini Fin area Total weight Typical 2.9 19 8.4 applications: model (m2) (tonnes) applications: 3.5 27 9.04 • Large motor yachts • Corvettes 4.8 19 12.2 10 1.4 1.92 • Fast ferries • Frigates NR26 5.0 27 14.4 20 2 3.75 • Destroyers • Small naval and 6.5 19 18.6 coastguard vessels 30 3.2 6.75 • Aircraft carriers NR30 7.0 26 21.1 All data subject to change without prior notice. 9.0 19 26.6 NR35 9.5 25 29.9 12.0 18 36.72 NR41 13.0 25 42.4 Gemini offers a compact low weight The hull-closing plate is included as 16.5 18 52.1 design. an integral part of the fin unit. All data subject to change without prior notice.16 17
  10. 10. Intering™ Intering™ tankstabilisation systems stabilisation systems Intering controlled tank systems are General description designed to give 40-50% lower roll on stabilisation systems average. Unlike passive tanks, Intering Rolls-Royce is a turnkey supplier tank stabilisers react immediately and of marine stabilisation systems, individually to any changes in roll including the Intering tank motion, providing top performance stabilisation systems and Intering and flexibility. They are also effective Anti-heeling systems. This range at low speed or when stationary. of products can be supplied as stand-alone systems or as part of Rolls-Royce Intering U-shaped tank Intering tank stabilisers are a collective system. More than stabiliser systems use water or heavy effective even at low speed. 650 vessels to date have been fluid, and can be supplied as stand- Typical The illustration visualises a combined applications: fitted with Intering motion alone systems. They can also be tank stabiliser and anti-heeling system. • Ro-Ro vessels control equipment. combined with an anti-heeling system • Container vessels for increased safety/payload or Brown • Yachts • Offshore supply vessels Brothers fin stabilisers for forBrown Brothers™/Intering™ enhanced roll reduction at any speed. • Diving support vessels • Paper carrierscombined stabiliser systems The U-shaped tank stabiliser comprises • Ice breakers • Cable layers two tanks which are linked by a channel across the ship; one port and one starboard. The system is tuned so Intering tank stabilisers are optimised • More comfort and smoother that when a ship rolls, more water will to be effective in different loading running of vessels rise on the "high" side, thus creating a conditions. More than one set of tanks • Efficiency independent of ships righting moment to reduce the roll. can be fitted when necessary. speed Valves block the water flow in cycles Where tank space is limited, Intering • Immediate and individual reaction The Valves are maintenance-free, and provide smooth and precise operation. by controlling the air pressure above systems can use a corrosion-inhibiting to any change in roll motion the waterline to create optimal effect. heavy fluid, reducing the space • Dual use of tanks in harbour forThe required fin size The inevitable free surface effect of required by more than 30%. anti-heeling operationfor the combined system stabiliser tanks can be compensated if • No need to alter tank wateris smaller with enhanced Intering tank stabilisation systems provideroll reduction at all speeds. these are included in a ships design Product benefits: levels. roll reduction of up to 40 – 50% in normal Intering from the outset. • Up to 40 – 50% roll reduction at sea • Low maintenance – no moving rough seas, which is enough to prevent • Damage to cargo and ship avoided parts in water damage from rolling.Rolls-Royce can supply a required fin size and improve rollcombination of fin stabilisation and reduction at all speeds.passive tank stabilisation systems,giving advantages which cannot be Product benefitsachieved from a single system alone. • Roll reduction achieved at allTank stabilisers are an attractive speedscomplement to fin stabilisers, which • Reduced drag from using smallerneed a minimum speed of six or finsseven knots in order to be effective. • Fins do not need to be off-set,A combined system can reduce the thereby increasing efficiency18 19
  11. 11. Intering™ Intering™ Parametric rollanti-heeling prevention system (IPRP)systems ON The anti-heeling system keeps ships upright during loading and unloading. OFF Parametric roll prevention systemsThe Anti-heeling were developed to with the anti-heeling systems. Unlike are designed to prevent the build up Typicalkeep ships upright during loading anti-heeling systems, these make use applications: of parametric roll in head or followingand unloading. The Intering of ballast tanks fore and aft in the • Ro-Ro vessels seas. Sea-keeping model testsanti-heeling system uses a constant vessel to compensate for any trim • Container ships demonstrate that the Intering • Ferries These images show the benefit of thepneumatic air purge and regulating moments automatically or on the Parametric Roll Prevention system parametric roll prevention system. • Paper carriersvalve system to force air into the top command of a controller. be operated • Ice breakers can reduce the risk of parametricof one tank while venting the one on by dedicated trim pumps or designed • Offshore supply vessels disturbance by shifting the critical • Heavy lift ships wave threshold to such high valuesthe other side. This rapidly transfers as an integral element within thewater from one side of the vessel to ballast system. that the the chances of everthe other, creating a righting moment, encountering such a roll during awhich compensates for heeling forces. Product benefits vessels service life are extremely low. The system is effective in preventingThis system is available as a stand- • Rapid loading and unloading parametric roll and also in minimisingalone system and/or in combination • Damage avoided to ramps, rolling A typical example of a complete ship regularly disturbed roll motion by upwith the functionality of continuous cargo, cell guides and containers system will include several pairs of to 20%. Interingcyclical heeling in level ice • Unlimited change of water flow U-shaped tanks and pneumatically(Ice-Heeling System). direction (air blower system) controlled air valves, plus a control Product benefits: • No current peaks for motor starts unit with pitch and roll sensors. The • Prevents the build-up of parametricIntering systems up to 5,000 tonnes during operation (air blower controller detects the onset of roll in a head or tail wind for Typicalmetres per minute are in operation system) parametric rolling and uses the improved safety applications:and can be supplied as either stand damping effect of the tanks fluid’s • Reduces regular ship roll by about • Mainly large • Loading and discharging quicker container shipsalone air blower activated, combined • Harbour time reduced thus saving oscillations, which is controlled by air 20%with tank stabilisers, pump activated, on port costs valves in accordance with the ships • Automatic response – system iswith dedicated heeling pump or • Systems with heel compensation motion. always in standby mode The fast reacting valve group is anintegrated into the ballast system. have a rate of up to 5,000 tm/min integral part of the air blowerTrim control systems can be combined when in operation anti-heeling system20 21