Mampaey Dynamic Oval Towing (DOT) System

Slide 1: 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.

Slide 2: 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

Slide 3: 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

Slide 4: Quick Release Disk Type Towing Hook • For towing with all towing materials • Ranging from 5 to 250 tons SWL

Slide 5: Radial support • Widely applied on tugs • Safety measure against capsizing • 180 degree support ….. and further

Slide 6: Mampaey DOT® System 360° all around towing platform

Slide 7: How does it looks like?

Slide 8: A Tug equipped with a DOT Can do anything a conventional tug can! The DOT-system: • Safety • Efficiency And in addition to that the DOT enhances the: • Flexibility • Safety, since it can not capsize anymore • Controllability • 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

Slide 9: Safety • Stability is significantly increased by a The DOT-system: movable towline attachment • Safety – Capsizing due to towline forces is • Efficiency prevented • Flexibility • Controllability

Slide 10: Stability increases Safety The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 11: Stability Fixed Towing Point Reasonable risk of capsizing due to towline forces is unlikely! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 12: Stability with 360° towing Likeliness of capsizing due to towline forces is unlikely! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 13: Efficiency • Taking advantage of forces The DOT-system: – Since the tug can not capsize anymore, the • Safety tugs’ resistance in all directions can be • Efficiency used for generating steering and breaking • Flexibility forces. • Controllability – Use of Dynamic forces instead of straight propulsion power saves fuel

Slide 14: Hydrodynamic Forces Since the tug can not capsize anymore…. The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 15: Full Flexibility Full scope of towing operations The DOT-system: integrated in one single system: • Safety • Efficiency • Flexibility • Standard conventional towing over the • Controllability stern (unchanged) • Dynamic escorting over the bow • Dynamic braking and steering from the sides Smooth operation with continuous towline connection.

Slide 16: Conversion to a DOT-tug The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 17: Remember, a tug equipped with a DOT Can do anything a conventional tug can! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 18: And much more, like dynamic breaking and steering from the sides The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 19: and dynamic escorting over the bow The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 20: Full Controllability • Controllability in all directions The DOT-system: The oval shape matches the towline • Safety force with the tugs’ resistance in one • Efficiency towing system for all directions. • Flexibility • Controllability

Slide 21: Full Controllability • Is achieved with minimal use of The DOT-system: • Safety propulsion power when the towline force • Efficiency is matched with the hydrodynamic • Flexibility forces. • Controllability

Slide 22: When towline forces are not aligned Tug will rotate…. The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 23: When towline forces are not aligned Tug will rotate…. until the forces are aligned The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 24: Controlling direction of tug Option 1: Conventional “Solving” Solution; Engine Power limited to a certain speed and propulsion power! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 25: Controlling direction of tug Option 2: “Dissolving” the Problem; Aligning Towline Force In control without engine power at any speed! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 26: Controllability when: • Full controllability is achieved with The DOT-system: minimal use of propulsion power when • Safety • the towline force is matched with the Efficiency • Flexibility hydrodynamic forces. • Controllability BUT…… • The position of the center of lateral resistance is different when the direction of the tug changes.

Slide 27: That’s why current tugs have two towing installations: The DOT-system: 1 2 • Safety • Efficiency • Flexibility • Controllability

Slide 28: 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? The DOT-system: • Safety • Efficiency • Flexibility • Controllability Only an OVAL can do this!

Slide 29: An oval with moving carriages is always matching the towline with the hydrodynamic forces! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 30: An oval with moving carriages is always matching the towline with the hydrodynamic forces! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 31: An oval with moving carriages is always matching the towline with the hydrodynamic forces! The DOT-system: • Safety • Efficiency • Flexibility • Controllability

Slide 32: 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

Slide 33: 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

Slide 34: 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

Slide 35: Development • Structural design was performed by IMC based upon state of the art Finite Elements Calculations • Optimized for strength and cost efficiency

Slide 36: Testing • Scale testing for concept validation • Full scale testing for strength validation

Slide 37: Production • The System will be produced, as all Mampaey products out of first quality components with class approval

Slide 38: 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: 8,5 tons Delivery: April 2008

Slide 39: Delivered to Macduff

Slide 40: 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

Slide 41: What we did 1. A design was sent to Mampaey

Slide 42: What we did 2. The towing points of the tug were determined.

Slide 43: What we did 3. Preferred Hydrodynamic Position and Shape was determined.

Slide 44: What we did 4. Users profile and structural support were taken into account.

Slide 45: What we did 5. an AutoCAD file with the preferred oval and position was returned.

Slide 46: What we did 6. The designer integrated the DOT system into the design.

Slide 47: What we did 7. The proposed design was structurally analyzed by an external consultancy firm IMC.

Slide 48: What we did 8. The result meets users profile and a high level of quality.

Slide 49: DOT 30 on Harbor Tug

Slide 50: DOT 30 on Harbor Tug

Slide 51: 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 Award 2007 of the Government of South-Holland

Slide 52: Conclusion The 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!

Slide 53: Are there any Questions?