Dynamic Positioning - Introduction

1. DYNAMIC POSITIONING
“AN INTRODUCTION”

2. Dynamic Positioning
Operator
 Nautical Institute DPO certification progress paths

3. DP Topics
 Background
 Principles of a DP
 Elements of a DP System
 Position Reference Systems
 DP Operations
 Class to DP System Class

4. Background - DP
o Dynamic positioning (DP) is born in the 1960s.
 Dynamic Positioning (DP) began in 1960’s
 “Eureka” first DP vessel in 1961
o1000 over vessels/platform presently in serviceof 1961.
The first dp vessel was the "Eureka",

5. Summary DP Installations
 DP Drilling platforms
 Diver Support Vessel – DSV
 Pipelay (rigid and flexible)
 Cable lay and repair
 Hydrographic surveys
 Dredging
 Shuttle tanker
 Floating production(with/without storage)
 Remote Operated Vehicle – ROV
 OSV, PSV Multi-purpose

6. DP Advantages
 Vessel Heading set by:
 DP operator – manual
 DP system – automatic
 Vessel Position set by:
 DP operator – manual
 DP system – automatic
 Support close proximities
 10m from crane – typical
 Above drill or dive location
 Construction
 Retrieval

7. Principles of DP
 Definition
 A system which automatically controls a vessel’s
position and heading exclusively by method of
propeller generated thrust force, from Main propulsion
and thrusters.

8. Principles of DP
Schematic diagram of DP system

9. DP Control System

10. DP Position Model
 Kalman Filter

11. Principles of DP
 Six freedoms of vessel movement
 DP controlled axis
 Yaw, Surge and Sway
 DP measured
 Roll, Pitch and Heave
 DP is concerned with the automatic control of Surge,
Sway and Yaw. Surge and Sway comprise the position of
the vessel, while Yaw is the vessel heading

12. Elements of DP System
 DP Control Console(s)
 DP Signal Processing Unit(s)
 Programmable Logic Controllers
 Input/Output Modules
 Analogue
 Digital
 Heading
 Gyro
 Position
 DGPS

13. Elements of DP System
 Propulsion / Thruster Configurations

14. Position Reference
Systems
 Differential GPS
 Hydroacoustic Position Reference (HPR)
 Taut Wire
 Laser-Optical
 Differential Absolute Relative Position System (DARPS)

15. POSITION REFERENCE
 Differential Global Position System

16. Hydroacoustic Position Reference
(HPR) System
 Long Baseline
 Short Baseline
 Ultra-Short Baseline
 Super-Short Baseline

17. Hydroacoustic Position
Reference
 Long Baseline

18. Taut Wire – Position Reference
System
 Static work locations
 Limited by cable length
 Electro-Hydraulic winch
 Deck mount, 90° over vessel side
 Weight to stabilize cable to seabed
 Measure 30° vertical angle
 Vessel position movement

19. Optic – Laser Position
Reference
 Fanbeam Cyscan

20. DARPS Position Reference System
Differential Absolute and Relative Position System

21. DP Operations
 Diving
 Surface
 Saturation
 Deep

22. DP Operations
 Survey
and ROV Support

23. DP Operations
 Seabed Tractors and Trenchers

24. DP Operations
 Pipelay Operations
 S-Lay
 J-Lay
 Reel-Lay

25. DP Operations
 Track-Follow (Waypoint Routes)

26. DP Operations
 Cable Lay and Repair

27. DP Operations
 DP Drilling
 Ships
 Semi-Sub

28. DP Operations
 Offtake Tanker
 FPSO

29. DP Operations

30. DP Class to Survey
Classification

31. NAUTICAL INSTITUTE
 Dynamic Positioning
Operator – Unlimited