1. Set a course for optimum reliability
and performance
steering and stabilisation
Rolls-Royce plc
Commercial Marine
PO Box 160, NO-6065 Ulsteinvik, Norway
Tel. +47 70 01 40 00
Fax +47 70 01 40 05
Naval Marine
PO Box 31 Fishponds, Bristol BS16 1XY, England
Tel. +44 117 974 8500
Fax +44 117 979 2607
www.rolls-royce.com

2. Moving your business The best in technology
and system solutions
towards higher profitability
Steering and stabilisation
Rolls-Royce is one of the largest international
suppliers of marine technology, products and
systems. Our design principles are always focused
on the future operation and service needs of
modern, high-tech vessels which demand the best
products available on the market.
Our vast expertise in marine technology and long
traditions of working closely with customers
enables us to supply a full range of motion control
products and systems. Internationally acclaimed
products such as Tenfjord and Frydenbö steering
gear, Ulstein Hinze rudders, Brown Brothers fin The state-of-the-art hydrodynamic test needs of individual vessels. Being a single source supplier
stabilisers 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-integrated
Many of these products have operational lives of The hydrodynamic test centre in Sweden is equipped with two
stabilisation products. The centre's have shared their hard-earned system solutions minimise running
25 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 vessel's performance.
provide services that ensure cost efficient and
two cavitation tunnels. These allow us our marine engineers. Close Furthermore, customers have a single
reliable 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 way
With a truly international presence with fully in depth, leading to solutions that within the Rolls-Royce range of from the initial conceptual design of a
qualified local service engineers and technicians, meet customer demand for reliability, products. vessel and selection of equipment to
Rolls-Royce provides an unequalled global marine cost-efficiency and optimal in-service support and flexible
capability. A capability to move your business Contents: performance – tailored to meet the financing.
towards higher profitability.
Steering gear pages 4 - 9
World famous motion control product names Rudders pages 10-13
supplied by Rolls-Royce: Fin stabilisers pages 14-17
Stabilisation systems pages 18-21
Brown Brothers™
Customer support pages 22-23
Frydenbö™
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. Tenfjord™
rotary vane
steering 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. Frydenbö™ rotary vane
steering gear
Frydenbö RV series steering gear
Steering gear
The Frydenbö steering gear has a
proven service record on all types of Typical
vessels. Today’s range is suitable for applications:
• Oil tankers
medium-sized to large ships,
• Ro-Pax vessels
including large container vessels and • Container vessels
VLCCs. The weight is typically 50- • Bulkers
• Cruise vessels
60% of a RAM-type steering gear,
• LNG-tankers
with much smaller space requirement.
The Frydenbö RV and IRV series are
Furthermore, 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 its
makes installation even easier, as no further development of the well proven simplicity, robustness and reliability, and
expansion tank is needed. Installation Frydenbö range of steering gears with two satisfies all requirements for tankers over
is also simpler because of the and three vanes. 100,000dwt.
Frydenbö IRV series steering gear statutory requirements for tankers
integrated 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 range
Control modulates the oil flow to the dwt. This requirement is met by the RV 550-2 370 568 2 x 71.5 3500 1400 500
actuator 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 700
and low rudder speed for small automatic isolation of the actuator's The Frydenbö Unitized steering gear RV 850-3 420 853 2 x 46.5 3700 1400 500
rudder 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 700
gradually increases to full flow,
RV 1100-2 510 1094 2 x 71.5 8000 3000 1250
allowing 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 700
rudder. 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 700
precise 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 1250
rudder 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 1250
while 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 1250
manoeuvring capability when seals. This cuts labour costs, minimises risk RV 2600-3 620 2563 2 x 46.5 11500 3000 1250
needed. 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 1250
Product 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 4500
6 as the IRV model, which satisfies all Modulated flow control. All rights reserved. All data subject to change without prior notice. 7

5. Brown Brothers™ Brown Brothers™
naval rotary vane actuator type of
steering 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 hydraulic
with digital controls and autopilot naval fleets. to one side, although gears can be a cost-effective and reliable solution. driving mechanism, replacing an
have 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 or
of the world's 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:
• Corvettes
Spain, 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 units
Navy. 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 specific
to 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 actuator's 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. Ulstein Hinze™ conventional
rudders, 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 rudder's 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. Ulstein Hinze™
flap rudders
Rolls-Royce has developed and built
flap rudders since 1985. The
performance of a flap rudder is
determined both by the flap, the link
mechanism and the profile, as well as
the hull and propeller. Rolls-Royce
has therefore designed a range of flap
rudders to cover different types of
vessels and functions, in order to
make sure that customers receive a
Rudders
rudder best suited to their vessels and
operations.
Ulstein Hinze FB has a bulbous
profile for maximum manoeuvring Typical applications:
performance, suitable at low to Ulstein Hinze FB rudders:
medium speed. This rudder also has • Offshore supply vessels
• Fishing vessels
large upper and lower vane plates. It • Seismic vessels
is ideal for use on workboats, fishing • Cargo vessels
vessels and offshore vessels, as well Ulstein Hinze Ulstein Hinze FS.
Ulstein Hinze FM/FS
FB/FM.
as on small tankers, cargo vessels, rudders:
ferries and other coastal vessels. • Passenger vessels
• Cargo vessels
• High-speed craft
Ulstein Hinze FM has a moderate
profile for enhanced manoeuvrability,
suitable at medium speed. The
rudder is suited to vessels up to
20,000 dwt with high demand for
manoeuvrability. Available options:
• Trunk module with steering gear
Ulstein Hinze FS has a slim profile, foundation
suitable at medium to high speed. • Automatic lubrication system
The rudder is built around a cast cone • Special bearings/liners
module, and has a strong link • Heel connection module
mechanism and hinge system to
Product benefits:
withstand high forces. Used for
• Superior steering abilities
Ro-Ro, Ro-Pax, passenger and cruise
• Minimum installation time
vessels and tankers, but it is also an
• High reliability
all-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. Brown Brothers™
folding-fin
stabilisers
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. Brown Brothers™
non-retractable
stabilisers
The Gemini range of Brown Brothers modular
non-retractable stabilisers stabilisers meet military
are suited to small, standards for noise, shock
commercial 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 gland
For 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 bearings
commercial vessels where high fully satisfy military standards for
due to high-lift fin The hull-closing plate is an integral • Special finshaft coating
performance 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 procedure
important 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 levels
The 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 with
non-retractable stabilisers can be proportional control valves and
systems avoided. Maintenance costs are also the design and performance of
supplied 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. Intering™ Intering™ tank
stabilisation 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 for
Brown Brothers™/Intering™ enhanced roll reduction at any speed.
• Diving support vessels
• Paper carriers
combined 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 for
The required fin size The inevitable free surface effect of required by more than 30%. anti-heeling operation
for the combined system stabiliser tanks can be compensated if • No need to alter tank water
is smaller with enhanced Intering tank stabilisation systems provide
roll reduction at all speeds. these are included in a ship's 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 roll
combination of fin stabilisation and reduction at all speeds.
passive tank stabilisation systems,
giving advantages which cannot be
Product benefits
achieved from a single system alone.
• Roll reduction achieved at all
Tank stabilisers are an attractive speeds
complement to fin stabilisers, which • Reduced drag from using smaller
need a minimum speed of six or fins
seven knots in order to be effective. • Fins do not need to be off-set,
A combined system can reduce the thereby increasing efficiency
18 19

11. Intering™ Intering™ Parametric roll
anti-heeling prevention system (IPRP)
systems
ON
The anti-heeling system keeps ships
upright during loading and unloading.
OFF
Parametric roll prevention systems
The Anti-heeling were developed to with the anti-heeling systems. Unlike are designed to prevent the build up
Typical
keep ships upright during loading anti-heeling systems, these make use applications: of parametric roll in head or following
and unloading. The Intering of ballast tanks fore and aft in the • Ro-Ro vessels seas. Sea-keeping model tests
anti-heeling system uses a constant vessel to compensate for any trim • Container ships demonstrate that the Intering
• Ferries These images show the benefit of the
pneumatic air purge and regulating moments automatically or on the Parametric Roll Prevention system parametric roll prevention system.
• Paper carriers
valve system to force air into the top command of a controller. be operated • Ice breakers can reduce the risk of parametric
of 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 values
the other side. This rapidly transfers as an integral element within the
water from one side of the vessel to ballast system. that the the chances of ever
the other, creating a righting moment, encountering such a roll during a
which compensates for heeling forces. Product benefits vessel's service life are extremely low. The system is effective in preventing
This system is available as a stand- • Rapid loading and unloading parametric roll and also in minimising
alone system and/or in combination • Damage avoided to ramps, rolling A typical example of a complete ship regularly disturbed roll motion by up
with the functionality of continuous cargo, cell guides and containers system will include several pairs of to 20%.
Intering
cyclical 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 parametric
Intering systems up to 5,000 tonnes during operation (air blower controller detects the onset of roll in a head or tail wind for Typical
metres 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 ships
alone 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 ship's • Automatic response – system is
with dedicated heeling pump or • Systems with heel compensation motion. always in standby mode
The fast reacting valve group is an
integrated into the ballast system. have a rate of up to 5,000 tm/min integral part of the air blower
Trim control systems can be combined when in operation anti-heeling system
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