TMR4225 MARINE OPERATIONS. SPRING 2004 Introduction

Transcription

1 TMR4225 MARINE OPERATIONS SPRING 2004 Introduction

2 Introductory issues Aim Schedule for lectures Time and topics Monologue versus dialogue Written material Language Exercises Plan and assistance Exam

3 General course information Lecturers: Professor II Finn Gunnar Nielsen, Norsk Hydro Research Centre, Bergen finn.gunnar.nielsen@hydro.com Professor II Tor Einar Berg, Marintek tor.e.berg@marintek.sintef.no Assistant: Torgrim Driveklepp torgrid@marin.ntnu.no Office Phone Exercises: Approx. 8 Min. 6 required for exam. Exercise No. 1 will be graded and count 30% in the final grading. EXAM: 15 May

4 AIM Give overview and physical insight into typical marine operations related to offshore activities. Learn how to make order of magnitude estimates of loads and responses. Understand background for more advanced numerical methods.

5 Literature Nielsen, F.G.: "Marine Operations. Lecture Notes" (Jan. 2003) Berg, T. E.:."Marine Operations - Subsea Vehicles. Lecture Notes Faltinsen, O.M. "Sealoads on Ships and Offshore Structures (Handouts).

6 Schedule (1:2) Lectur e no Date Topic Content Fri. Introduction, 9.01 Rules Thurs15.0 Planning 1 Towing Fri. Underwater vehicles Thurs29.0 Towing 1 5 Fri Crane operations Introduction to the course. Examples of marine operations and UV manoeuvring. Overview of rules and regulations. Criteria for operation. Weather windows. Simulation of operations. Towing. Examples of submarines, ROVs and AUVs. Work tasks for ROVs and AUVs in offshore operations. Propeller forces. Towlines, restoring forces, dynamic loads. Examples of heavy lift vessels and operations. Multi-body dynamics. Static and dynamic response of simple systems. 6 Fri AUV /ROV AUV hydrodynamics and Hugin operational experience. 7 Thurs Crane operations Lifting in deep water. Wire dynamics

7 Schedule (2:2) 8 Fri Project presentations Short presentations of all group work 9 Fri Dynamic stability Hydrodynamics of ROV. Directional stability 10 Fri ROV Simulation of ROV operations and ROV pilot training 11 Thurs Crane dynamics Dynamics of a body hanging above and in water. Heave compensation. 12 Fri Water entry. Hydrodynamic forces on a body crossing the wave zone. Hydrodynamic coefficients. 13 Thurs Water entry Hydrodynamic coefficients continued. Statistics The probability of snap loads / impact during lift off 14 Fri Pipelaying. Pipelaying in deep water. Summary Summary of course, feedback EXAM

8 PRELIMINARY LIST OF EXERCISES: Exercise Topic Given Due no. 1 Team work, Review of specific operations Towing Crane operations AUV Dynamic stability ROV Water entry Heave compensation

9 Team work. Groups of 2-3 students EXERCISE NO 1, spring 2004 (Counts 30% in final grading) EXAMPLES OF MARINE OPERATIONS. Physical phenomena and relevant analysis. Given: Due: In the list below you will find examples of marine operations and some related problems. Each group choose one example. For the operation chosen, you should: Give specific, practical examples (from literature) on the operation. Discuss which physical phenomena that must be accounted for in design equipment used and in planning the operation. Highlight critical issues Discuss how the system can be analysed to quantify the critical issues (e.g. how to asses stability, force, clearances etc.) The work shall be summarized in a report. Put emphasis on making a well written report including proper documentation and references. A 10 min. oral presentation of the main findings shall be prepared. The presentation is to be held

10 Exercise No. 1 Topics A. Installation of jackets by towing on barge and crane assisted installation. B. Deepwater installation of subsea modules from floating crane. C. Deep water pipelaying. A comparison between s-lay and j-lay. D. Hydrodynamic loads on subsea modules during installation by crane. E. How to establish hydrodynamic coefficients to estimate proper water entry loads. F. Towing. Forces in towing lines. G. Heave compensation. Capacities and characteristics of compensators. Dynamic response. H. Oil recovery. State of art equipment, limitations of equipment. Modes of operations. I. Ormen Lange; Examples on use of an AUV (Hugin) J. ROV operations at large depths. K. Review of concepts for use of large manned submarines in offshore operations.

11 Limited duration Transient condition. May be interrupted Marine operations Key features Do not need to design for extreme conditions Weather dependence

12 Practical experience versus physical insight. Engineering approach Understand physics of system Quantification by simple methods Detailed analysis Advanced numerical tools, experiments

13 Examples on marine operations (DNV) Load Out: Transfer a structure from land onto a vessel Float Out: Transfer a structure from a dry construction site to a self floating condition. Float on / Float off: Transfer a floating structure onto a vessel and vice versa. Towing: Pushing / pulling by tugs. Self propelled carrier transports: Transport on deck of a self-propelled vessel Launching: Cutting seafastening of a structure and slide down launch rails to a free floating condition. Upending: Upend a floating structure. Positioning: Position a structure a predetermined location Setting: Set down a structure, levelling and soil penetration. Pipelaying: Laying pipe on the seafloor.

14 Examples on marine operations (DNV) Piling: Secure a structure to sea bottom by driving piles into the soil. Offshore loading: Loading e.g. oil from one vessel to an other. Grouting: Cementing piles after pile driving or injection of cement to level foundation. Lifting: Lift or support a structure by crane. Lift off: Transfer a structure from a temporary construction site onto a transportation vessel. Mating: Join two floating structures. ROV /AUV operations: Work on subsea equipment, surveilance, bottom mapping. Etc...

15 Some classical offshore structure. Challenges w.r.t Installation Operation Repair / maintenance Removal

16 History of jackets

17 Jacket installation, self-floater

18 Jacket installation, launching & crane assistance

19 Gravity base structure, Condeep

20 Jackup & jacket

21 Semisubmersible

22 Floating production

23 Semisubmersible craneship

24 Offshore loading buoy

25 Offshore loading