Mampaey Dynamic Oval Towing (DOT®) System
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Transcript of Mampaey Dynamic Oval Towing (DOT®) System
Dynamic Oval Towing System
by: P.P.A. Snijders MSc. B.Eng.
DOT® is a registered trademark of Mampaey Offshore Industries B.V.The DOT system is protected by patents.
Agenda:• Introduction to Mampaey• 360° all around towing evolution• Benefits of the system• Development• How we work• DOT® 30 for Harbor Tug Application• Future Developments• Conclusion
Mampaey Offshore Industries B.V.• Over 100 Years experience in towage
industries• Designer of the Quick Release Towing Hook• Designer of the Quick Release Mooring Hook• Market leader in safe Towing & Mooring
Solutions
Early Mampaey
Towing Hook
Quick Release Disk Type Towing Hook
• For towing with all towing materials• Ranging from 5 to 250 tons SWL
Radial support• Widely applied on tugs• Safety measure against capsizing • 180 degree support
….. and further
Mampaey DOT® System360° all around towing platform
How does it looks like?
A Tug equipped with a DOT
Can do anything a conventional tug can!
And in addition to that the DOT enhances the: • Safety, since it can not capsize anymore• Efficiency, since it makes use of the
hydrodynamic forces• Flexibility, since it integrates all towing
operations into one system with a continuous towline connection
• Controllability, even at higher speeds
Without any restrictions to any other operation
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Safety• Stability is significantly increased by a
movable towline attachment– Capsizing due to towline forces is
prevented
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Stability increases Safety
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Stability Fixed Towing Point
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Reasonable risk of capsizing due to towline forces is unlikely!
Stability with 360° towingLikeliness of capsizing due to towline forces is unlikely!
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Efficiency• Taking advantage of forces
– Since the tug can not capsize anymore, the tugs’ resistance in all directions can be used for generating steering and breaking forces.
– Use of Dynamic forces instead of straight propulsion power saves fuel
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Hydrodynamic ForcesSince the tug can not capsize anymore….
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Full FlexibilityFull scope of towing operations
integrated in one single system:
• Standard conventional towing over the stern (unchanged)
• Dynamic escorting over the bow• Dynamic braking and steering from the
sides
Smooth operation with continuous towline connection.
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Conversion to a DOT-tug
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Remember, a tug equipped with a DOTCan do anything a conventional tug can!
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
And much more, like dynamic breaking and steering from the sides
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
and dynamic escorting over the bow
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Full Controllability• Controllability in all directions
The oval shape matches the towline force with the tugs’ resistance in one towing system for all directions.
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Full Controllability
• Is achieved with minimal use of propulsion power when the towline force is matched with the hydrodynamic forces.
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
When towline forces are not alignedTug will rotate….
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
When towline forces are not aligned
until the forces are aligned Tug will rotate….
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
Controlling direction of tugOption 1: Conventional “Solving” Solution; Engine Power
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
limited to a certain speed and propulsion power!
Controlling direction of tugOption 2: “Dissolving” the Problem; Aligning Towline Force
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
In control without engine power at any speed!
Controllability when:
• Full controllability is achieved with minimal use of propulsion power when the towline force is matched with the hydrodynamic forces.
BUT……
• The position of the center of lateral resistance is different when the direction of the tug changes.
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
That’s why current tugs have two towing installations:
1 2The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
The changing of the hull forces How to align the towline with the forces acting upon the
hull for all directions into one towing system?
Only an OVAL can do this!
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
An oval with moving carriages
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
is always matching the towline with the hydrodynamic forces!
An oval with moving carriages
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
is always matching the towline with the hydrodynamic forces!
An oval with moving carriages
The DOT-system:
• Safety
• Efficiency
• Flexibility
• Controllability
is always matching the towline with the hydrodynamic forces!
That’s why an Oval• High speed assistances are as safe and
controlled as low speed assistances!
• An oval is the only shape that can integrate all towing points into one towing system.
• Full control in all directions with minimal use of propulsion power!
• Sufficient space available for superstructure
DOT Rail system• Towline force is evenly distributed into
tug’s deck structure– Minimal structural material required
• Easy to integrate with new and existing tug structures
Rail system• Modular design for various towing
applications • Minimal number of (moving) parts• Insensitive to wear due to high
tolerances• Easy to assemble and interchange
components
Development• Structural design was performed by
IMC based upon state of the art Finite Elements Calculations
• Optimized for strength and cost efficiency
Testing• Scale testing for concept validation• Full scale testing for strength validation
Production• The System will be produced, as all
Mampaey products out of first quality components with class approval
First DOT15-system Sold
Owner: Peterhead Port Authority
Designer: Macduff Ship Design
Dimensions: 13 m x 5,40 m x 2,80 m
Engines 2 x 300 bhp Scania
Bollard Pull:
Delivery:
8,5 tons
April 2008
Delivered to Macduff
How can we facilitate the integration?
We can provide the following services:• A simple drawing of the system• Determining position of system• Analyzing proposed solution
What we did1. A design was sent to Mampaey
What we did2. The towing points of the tug were
determined.
What we did3. Preferred Hydrodynamic Position and
Shape was determined.
What we did4. Users profile and structural support
were taken into account.
What we did5. an AutoCAD file with the preferred
oval and position was returned.
What we did6. The designer integrated the DOT
system into the design.
What we did7. The proposed design was structurally
analyzed by an external consultancy firm IMC.
What we did8. The result meets users profile and a
high level of quality.
DOT 30 on Harbor Tug
DOT 30 on Harbor Tug
Awards• Maritime Vietnam 2006 Innovation Award• Mampaey; the most innovative SME in the
Netherlands!We have received the nr. 1 position in the Dutch Innovation Top100 organized by innovation network Syntens & bizz magazine for entrepreneurs.
• Seawork 2007 most innovative vessel design award for Macduff Ship Design by installing the first DOT system on a tug.
• Innovation Complement Award2007 of the Government of South-Holland
ConclusionThe DOT system meets the demand for the
optimal tug
The DOT system is an attribute that is:• Easy to integrate into a tug design• Simple to install and maintain• Durable in the most severe circumstances• Improving the overall performance of the tug!
Are there any Questions?