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Rajesh Panicker October 2013 Wind Turbine Installation Vessels – Classification Concepts Supporting Sustainable Energy.

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Presentation on theme: "Rajesh Panicker October 2013 Wind Turbine Installation Vessels – Classification Concepts Supporting Sustainable Energy."— Presentation transcript:

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2 Rajesh Panicker October 2013 Wind Turbine Installation Vessels – Classification Concepts Supporting Sustainable Energy

3 © Det Norske Veritas AS. All rights reserved. October 2013 Agenda Introduction Offshore Wind Developments Classification Concepts WTI Vessel concept – Driver for Rule and Flag requirements DNV Rules for Wind Turbine Installation vessels Class notations + Considerations In-operation phase 2

4 © Det Norske Veritas AS. All rights reserved. October 2013 DNV GL – The leading Classification society Innovation High dedication to, and investment in, research & development Network A world leading classification society with a dense station network across more than 80 countries Expertise Combined leading technological expertise across all ship segments Service Wider and deeper service offering across all ship segments

5 © Det Norske Veritas AS. All rights reserved. October 2013 Electricity Generating Costs in EU, 2015 and

6 Rajesh Panicker October 2013

7 © Det Norske Veritas AS. All rights reserved. October 2013 Europe Wind Potential 6

8 © Det Norske Veritas AS. All rights reserved. October

9 © Det Norske Veritas AS. All rights reserved. October WTI units in the market >60-70% can not be used for future offshore developments - Insufficient crane capacity or - Insufficient size of vessel to support a large crane - weather restrictions - Can not cope with the offshore environment – to much motions - No self propulsion or slow speed May be used for support, maintenance and close to shore operation

10 © Det Norske Veritas AS. All rights reserved. October WTI units in the market During 2012 a number of new installation vessels were delivered, including. Northwind Installer by NorWind Pacific Orca by Swire Blue Ocean Seajacks Hydra and Zaratan by Seajacks Seafox 5 by Seafox Group Friedrich Ernestine by RWE Innogy Innovation by HGO InfraSea Solutions Bold Tern by Fred Olsen Windcarrier These purpose-built vessels, therefore, both reduce the number of harbour to wind farm site trips required during the installation process and increase the weather window during which offshore work can be carried out.

11 © Det Norske Veritas AS. All rights reserved. October

12 © Det Norske Veritas AS. All rights reserved. October

13 © Det Norske Veritas AS. All rights reserved. October

14 © Det Norske Veritas AS. All rights reserved. October Growth in size of commercial wind turbine designs

15 © Det Norske Veritas AS. All rights reserved. October

16 © Det Norske Veritas AS. All rights reserved. October Wind Turbine Foundations – Fixed

17 © Det Norske Veritas AS. All rights reserved. October Summary Purpose built vessels are the future for Offshore Wind Huge investment is required for construction and maintenance of fleet Decommissioning of old offshore wind platforms to start from About 20 new vessels under construction/ delivery billion investment. Douglass Westwood forecasts average 15 billion per year investment over next ten years ( ) in offshore wind sector. UK Round 3 provide sufficient scale for this size of investment US Offshore Wind Potential – Assessment in Progress

18 © Det Norske Veritas AS. All rights reserved. October Classification as a concept Classification is required when building a flagged vessel such as a WTI unit Classification has gained world wide recognition as an adequate level of safety and quality process which provides a sound basic safety standard Classification serves as a verification system for a number of parties who have special interest in the safety and quality of MOUs, such as: - National Authorities - Insurance underwriters - Owners - Building yards and sub-contractors - Finance institutions - Charterers

19 © Det Norske Veritas AS. All rights reserved. October Owner, Operator DNV-Class Work Scope Requirements Flag, Shelf, other Classification Scope - Verification of Requirements Clarification: What is applicable for a wind turbine installation unit? Statutory services based on delegated authority from flag state

20 © Det Norske Veritas AS. All rights reserved. October Classification of WTI vessels – dependant on how they operate Type A) Ship shaped Mobile Units

21 © Det Norske Veritas AS. All rights reserved. October A) Mobile Operation - Features Designed both for transportation and installation of equipment. Upload equipment at delivery port and sail fully loaded at high speed to installation site. Effective propulsion and Dynamic Positioning system both for - Self propulsion - Positioning before jacking up The vessel is designed to perform the complete installation cycle without assistance. Main Characteristics Ship-shaped hull. Good/reasonable forward speed capabilities (+10 knots). Unrestricted seagoing capabilities (without equipment). May not be designed to survive heavy weather at site in elevated condition. May choose to jack down and escape heavy weather.

22 © Det Norske Veritas AS. All rights reserved. October Classification of WTI vessels – dependent on how they operate Type B) Stationary

23 © Det Norske Veritas AS. All rights reserved. October B) Stationary Operation Vessel stays continuously at the installation site May be non-self propelled or have DP system, but then only for - Accurate positioning - Shorter field moves Wind Turbine equipment are supplied to site by feeder vessels WTI equipment installation implies offshore lifting Long voyages of WTI vessel only by support of tugs or on deck of heavy lift transporter Characteristics Triangular or box shaped Limited forward speed capabilities Limiting/restricted seagoing capabilities Capable of surviving heavy weather at site in elevated condition

24 © Det Norske Veritas AS. All rights reserved. October Offshore Unit or a Maritime Vessel in DNV? Different type of offshore vessels or units -Self Elevating Unit DNV-OS-C104 STRUCTURAL DESIGN OF SELF- ELEVATING UNITS (LRFD METHOD -Column Stabilized Unit DNV-OS-C103 STRUCTURAL DESIGN OF COLUMN STABILISED UNITS (LRFD METHOD) Ship Shaped Vessel DNV-OS-C107 SHIP SHAPED DRILLING AND WELL SERVICE UNITS Self elevating or Column Stabilized? Yes No Offshore StandardsShip Rules DNV-OS-C104 DNV-OS-C103DNV-OS-C107 or DNV Ship Rules Requirements related to exploration and production of Hydrocarbones X

25 © Det Norske Veritas AS. All rights reserved. October Definition of Class Rules & Statutory Certificates i)Offshore Support/Crane Unit Offshore Rules MODU code ii)Self-elevating Cargo Ship Ship Rules MODU + SOLAS + The vessel will be a mix of the two regimes Regime based on planned operation. Decision by Flag State + SPS Stationary Mobile

26 © Det Norske Veritas AS. All rights reserved. October Definition of Class Rules & Statutory Certificates Type A) Ship-shaped Mobile Operation Cargo vessel with self-elevating capabilities. Enters ports to pick up equipment on regular basis. DNV Rules for Classification of Ships to be used for all ship related items. MODU code for the elevating phase SOLAS certificates required because of the operation as a cargo ship. Type B) Stationary Operation Well known concept from Oil & Gas Industry. Designed and operated as a conventional Support/Crane Unit. Can be designed according to MODU Code and DNV Offshore Standards. SOLAS certificates may not be required, but this cut put limitations on how the vessel can be operated.

27 © Det Norske Veritas AS. All rights reserved. October Principles of classification WTI vessels May not be designed to survive a 100y storm at location. Then additional operational procedures to be established and followed: - Continuous monitoring of weather forecast - Preparedness for jack-down and escape Robustness of jacking system to guarantee successful jack-down

28 © Det Norske Veritas AS. All rights reserved. October 2013 DNV Notation 1A1 Self-Elevating Wind Turbine Installation Vessel/ Unit 27 Service notation introduced by DNV (October 2009) – OSS-101 Main motivation To provide a set of technical requirements. Recognition of vessels operational capabilities. The requirements for the notation shall capture the primary functions and operations that are typical for these vessels. May combine this with Crane Unit This makes it easier for designers to meet our requirements and for us to undertake the classification of the units.

29 © Det Norske Veritas AS. All rights reserved. October 2013 Ship-shaped self-elevating wind turbine installation vessels Class assumptions: Mix of offshore jack-ups and cargo ships NO Oil & Gas in scope and price!! Design assumptions Vessels carry out repeated operations in restricted waters Established practice is to allow for limited design conditions (unlike the design and class requirements for vessels used in the offshore oil and gas business). The design requirements needs to be consistent in order to ensure robust designs that are capable to withstand the relevant design loads for all design/operational conditions, or being able to escape in case of bad weather. 28

30 © Det Norske Veritas AS. All rights reserved. October 2013 Basic principle Hull & structureDNV OS-C107 (Section 1 A101) DNV-OS-C104 The hull strength may be assessed according to DNV Rules for Classification of Ships Pt.3 Ch.1 for all transit and operational conditions. Jack-up specific items (legs, jacking gear, guides, steel categorization, elevated conditions, overturning stability, preload capacity, fatigue) Electrical systemsDNV OS-D201Same as DNV Ship rules Part 4 Chapter 8, hence no difference. Marine and Machinery systems DNV OS-D101Same requirements as for ships Offshore refers back to Ship Rules Pt. 4 Preloading and piping arrangement, water intake DP systemsSHIP Rules Pt.6 Ch. 7 Same requirements for ship and offshore Instrument systemsShip control systems, engine control, ballast, bilge etc there are no differences between ship and offshore Stability & watertight integrity DNV OS-C301Same requirements for ship and offshore 29 Self-Elevating Unit

31 © Det Norske Veritas AS. All rights reserved. October 2013 Basic principle Hull & structureDNV OS-C103DNV Ship rules not relevant Electrical systemsDNV OS-D201Same as DNV Ship rules Part 4 Chapter 8, hence no difference. Marine and Machinery systems DNV OS-D101Same requirements as for ships but adjustments for Semi-specific items (ballast). Offshore refers back to Ship Rules Pt. 4 DP systemsSHIP Rules Pt.6 Ch. 7 Same requirements for ship and offshore Instrument systems:DNV OS-D202Ship control systems, engine control etc there are no differences between ship and offshore Ballast & bilge special for Semi design Stability & watertight integrity DNV OS-C301Special for Semi design 30 - Column Stabilized Unit

32 © Det Norske Veritas AS. All rights reserved. October DNV Class Notation Wind Turbine Installation Unit May be assigned to different types of vessels - A) Semi-submersible type - B) Stationary Self-elevating units - C) Ship-shaped self-elevating units - D) Ships with crane or other equipment specialised for WT Installation Purpose of the new notation is to identify the main function of the unit and to develop classification rules which cover this function Specific DNV WTI Rules developed – first release October 2010, covering self- elevating units (B+C).

33 © Det Norske Veritas AS. All rights reserved. October 2013 Jacking system Extended fatigue requirements to the jacking system because of many load cycles. (10 years operations x 100 moves per year) Design and construction of jacking system should ensure the possibility for the vessel to go into a floating condition and escape from site. It is a requirement to conduct an FMECAs (Failure Mode and Effect Criticality Assesment) with involvement of Class to highlight the critical issues with regard to jacking down and escape. Specific Accidental Load criteria may be defined through the FMECA. 32

34 © Det Norske Veritas AS. All rights reserved. October Requirements to the jacking and control system DNV-OS-D202 AUTOMATION, SAFETY, AND TELECOMMUNICATION SYSTEMS Ch.1 Sec An essential system A system supporting equipment, which needs to be in continuous operation or continuous available for on demand operation for maintaining the unit's safety. (Example propulsion and steering) Ch.1 Sec An important system A system supporting functions in order to perform in accordance to class equirement B 500 Repairable systems (R3) 501 A system serving a function of category R3 shall be designed to provide restoration of the function within a repair time specified for R3 in case of system failures. Guidance note: Restoring a function may involve a number of manual operations, including minor replacements or repair of equipment.

35 © Det Norske Veritas AS. All rights reserved. October 2013 Hull Strength Transit criteria For the normal transit condition we advice the hull strength to be adequate for un- restricted operations – i.e. designed for a 20-year North Atlantic storm criterium. This is in line with the +1A1 notation which is relevant as many vessels need to - Sail long distance from i.e. construction site in South East Asia to Europe. - Also the vessels may sail longer distances to operate in new geographical areas or the voyage they travel for picking up equipment to the wind farm may be substantial. 34

36 © Det Norske Veritas AS. All rights reserved. October 2013 Strength considerations Deck strength Large cargo weights require special strengthening of deck storage area. Future increase in wind turbine weights should be accounted for. Localized loads from cargo seafastening may apply. Deck box often designed in consideration of moderate draught combined with large vessel width and long span between legs. Global bending and torsional stability of deck box to be documented. 35

37 © Det Norske Veritas AS. All rights reserved. October 2013 Strength considerations due to Crane loads For Crane Notation – crane must be certified by DNV. Large crane loads must be accounted for in global analysis of vessel and combined with relevant environmental loading (waves, wind, current) All relevant crane positions to be checked for. Location of main crane around one leg will imply that this legs will see the highest utilization. Interaction between crane, leg and jack house to be investigated and accounted for. Insufficient stiffness of deck hull/jack house will imply that crane loads are supported/taken by the leg. 36

38 © Det Norske Veritas AS. All rights reserved. October 2013 Design and construction of legs Leg solutions vary substantially 37 Circular legsTruss legsSquare legs

39 © Det Norske Veritas AS. All rights reserved. October 2013 Leg design cont Vessels designed for restricted waters are also weight and strength optimized. Fabrication tolerance requirements (as for ordinary jack-up legs) High strength materials used in legs. Welding qualification is important (procedures, testing etc). Wear and tear from repeated jacking operations is important. 38

40 © Det Norske Veritas AS. All rights reserved. October 2013 Spudcan design 39 Spudcan design affects the leg design and also the design of the hull. Larger spudcans requires larger recess in the hull but implies less seabed penetration. Solution becomes a compromise.

41 © Det Norske Veritas AS. All rights reserved. October 2013 Statutory Compliance SOLAS compliance needed for vessels operating between ports. Large non-maritime crew requires additional SPS requirements to be fulfilled. This implies stronger requirements to stability and life saving. MODU code requirements still valid for the elevated condition. Flag state to decide level of compliance DNV will assist in communication with flag state. 40

42 © Det Norske Veritas AS. All rights reserved. October Bringing the unit into operation – focus of Class Support Drivers : Flexibility and Zero downtime In operation: - Vessel is continuously mobilized with full crew and service personnel onboard - Operations costs are running….. Concerns raised by owners: - They do not want to be constrained by a prescriptive survey schedule. In order for DNV to support our clients success factor we have developed and implemented suitable survey procedures that can be done on location and without interrupting planned operations. In order for DNV to support our clients success factor we have developed and implemented suitable survey procedures that can be done on location and without interrupting planned operations. The most important success factor for the MOU or WTI unit owners: zero downtime

43 © Det Norske Veritas AS. All rights reserved. October Increased Client Focus Dedicated rig-coordinator for each unit (Germany/Holland/Norway/UK) - Available - acts as a single point of contact - Takes lead in initiating, planning, executing and controlling surveys - Acts as a part of a wide network that benefits Owner and DNV - Able to decide and resolve issues efficiently - Manages approvals related to modifications and upgrades Dedicated fleet responsible for the owner in the head office (located in Oslo) Reduced interruption to the operation. Renewal survey on location if necessary Continuous survey scheme (Hull, Jacking System, Crane..) – no surprises' Approved Service Suppliers (NDE, chain, radio surveys…) Bottom surveys

44 © Det Norske Veritas AS. All rights reserved. October Risk of Down time may be because of a too marginal design: Down time or waiting time due to limitations in: - Elevated storm capacity - Jacking capacity - Sailing capacity - Deck payload capacity - Speed limitations - Vessel Stability - Capacity of crane Robustness and design according to a well established design specification is a key to success. Less may cost more….

45 © Det Norske Veritas AS. All rights reserved. October Improved Availability and Reliability – Class Support How can Class contribute? Design phase Early involvement in design phase – review of Design Basis Specific class notation considering operational requirements Assist on clarification of Flag and other essential design requirements In-service phase Optimized In-service Inspection Program – included in class fee (IIP) Systemize knowledge and sharing Class integrating with the owners maintenance scheme Partnership with the owners in developing new inspection methods Alternative risk based approaches

46 © Det Norske Veritas AS. All rights reserved. October Service Thank You Questions??

47 © Det Norske Veritas AS. All rights reserved. October Service Designs & Concepts

48 © Det Norske Veritas AS. All rights reserved. October DNV Recent and Ongoing Projects Fred Olsen Windcarrier – Brave Tern & Bold Tern MPI Adventure & Discovery DDW Batam 2 units 1 unit A2SEA Sea Installer 1 +1 unit

49 © Det Norske Veritas AS. All rights reserved. October New projects Inwind – Stavanger Yard selection in progress Concept Approval MPI - Holland 2 newbuilds at Cosco Nantong Option for 2 more considered Van Oord - Holland Another NG-9000 unit Quotation given to IHC Merwerde yard - Holland? Züblin – Germany 1 newbuild

50 © Det Norske Veritas AS. All rights reserved. October New designs Houlder (Gaoh) – UK Approval in Principle DNV London Ulstein Sea of Solutions - Holland Approval in Principle

51 © Det Norske Veritas AS. All rights reserved. October 2013 Existing Wind turbine installation units 50 Knud E. Hansen – Hull length m Hull width m Hull depth 7.40 m Hull draft 6.20 m Leg length max. (incl. spud-can) m MPI Resolution Hull length m Hull width 38.0 m Hull depth 8.0 m Leg length max. (incl. spud-can) m

52 © Det Norske Veritas AS. All rights reserved. October 2013 GustoMSC designs 51 NG-5300-HPE Hull length m Hull width m Hull depth 7.40 m Hull draft 3.50 m Leg length max. (incl. spud-can) m Hull length m Hull width m Hull depth 8.00 m Hull draft 4.60 m Leg length max. (incl. spud-can) m NG-7500-HPE Hull length m Hull width m Hull depth 9.00 m Hull draft 5.00 m Leg length max. (incl. spud-can) m NG-9000-HPE

53 © Det Norske Veritas AS. All rights reserved. October

54 © Det Norske Veritas AS. All rights reserved. October Huisman SWATH Approval in Principle to be undertaken by DNV Structural strength Vessel motions Stability

55 © Det Norske Veritas AS. All rights reserved. October WTI R&D project in France Independent verification of concept Structural strength Hydrodynamic analysis Global motions Vessel stability Project delivery: statement of feasibility

56 © Det Norske Veritas AS. All rights reserved. October Safeguarding life, property and the environment


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