The document introduces the Dynamic Oval Towing (DOT) system developed by Mampaey Offshore Industries. The DOT system allows tugs to tow vessels safely and efficiently in any direction by integrating all towing points into a single oval-shaped towing platform. This improves safety by eliminating the risk of capsizing, and improves efficiency by taking advantage of hydrodynamic forces. The DOT system provides full flexibility, controllability, and control of assisted vessels with minimal use of engine power. Mampaey has implemented the DOT system on harbor tugs and offers services to facilitate its integration into new and existing tug designs.

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.

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

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

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

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

6. Mampaey DOT ® System 360° all around towing platform

7. How does it looks like?

8. 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

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

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

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

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

13. 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

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

15. Full Flexibility Full 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

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

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

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

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

20. 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

21. 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

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

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

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

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

26. 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

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

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

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

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

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

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

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

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

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

36. Testing Scale testing for concept validation Full scale testing for strength validation

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

38. First DOT15-system Sold 8,5 tons April 2008 Bollard Pull: Delivery: 2 x 300 bhp Scania Engines 13 m x 5,40 m x 2,80 m Dimensions: Macduff Ship Design Designer: Peterhead Port Authority Owner:

39. Delivered to Macduff

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

41. What we did A design was sent to Mampaey

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

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

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

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

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

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

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

49. DOT 30 on Harbor Tug

50. DOT 30 on Harbor Tug

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

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!

53. Are there any Questions?