Class Perspective on Wind Turbine Jack-up Vessels The International - - PowerPoint PPT Presentation

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Class Perspective on Wind Turbine Jack-up Vessels The International - - PowerPoint PPT Presentation

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Class Perspective on Wind Turbine Jack-up Vessels The International Jack-up Barge Owners Association Meeting, Dartford 21st June 2011, Speaker Thomas Jahnke (GL ND) Contents Offshore Wind Market and Requirements Generations of Wind

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Class’ Perspective on Wind Turbine Jack-up Vessels

The International Jack-up Barge Owners Association Meeting, Dartford 21st June 2011, Speaker Thomas Jahnke (GL ND)

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presentation title | 2011-06-20 | No. 2

Contents

  • Offshore Wind Market and Requirements
  • Generations of Wind Turbine Installation Vessels (examples)
  • Rules and Regulation—Statutory
  • Rules and Regulation—Structure
  • Jacking System
  • Conclusion
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presentation title | 2011-06-20 | No. 3

Summary of the offshore wind energy market in the EU

  • Total installed capacity of 3,000 MW
  • Meeting 0.3 % of total EU electricity demand
  • Avoiding almost 7 Mio tons of CO2 annually

Year 2010

  • Total installed capacity of 150,000 MW
  • Meeting between 13 % and 17 % of total EU electricity demand
  • Avoiding almost 300 Mio tons of CO2 annually

Year 2030

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presentation title | 2011-06-20 | No. 4

Offshore Windfarming development – deeper and further, Trend until 2025

Northern Europe Southern Europe

Northern Europe

Source: EWEA.org

Current Projects Planned Projects

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presentation title | 2011-06-20 | No. 5

Increasing Turbine Sizes and Weights

300 - 500 t 100 - 120m 310 - 400 t 6 MW ~ 170 t 75 - 90 m ~ 185 t 3.6 MW ~ 110 t 75 - 90 m ~ 110 t 3 MW Tower Weight Hub Height Nacelle Weight (incl. Rotor) Turbine Size

2.3 MW 3.6 MW

Source: Siemens Wind Power

Already the world‘s biggest rotating machines

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presentation title | 2011-06-20 | No. 6

Foundations

1 2 3 4

1000 t ~ 35 - 60 m ~ 50 m Tripod 4 700 - 900 t ~ 25 - 60 m up to 70 m Jacket 3 1000 - 1500 t ~ 30 m Ø ~ 20 m Gravity 2 600 - 700 t ~ 4 - 5 m Ø ~ 35 m Monopile 1 Typical Weight Typical Size Typical Waterdepth Type

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presentation title | 2011-06-20 | No. 7

Generation I Combined crane and working barges Generation II Jackup barges without propulsion Generation III Self-propelled Jackup vessels

WTIV Generation I to III

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presentation title | 2011-06-20 | No. 8

Design Concepts WTIV - Generation I

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presentation title | 2011-06-20 | No. 9

Design Concepts WTIV - Generation II

Source: hochtief- construction.de

Jackup Barge THOR, GL

  • Self-Elevating
  • Non-self-propelled
  • Crane 500t
  • Waterdepth <=40m
  • 70 x 40m
  • Upgrade plans exist (self-propelled)

GL-Deliverables

  • Analysis and Verification
  • Newbuilding Classification
  • Plan Approval & Newbuilding Supervision
  • Fleet in Service
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presentation title | 2011-06-20 | No. 10

Design Concepts WTIV - Generation III

RWEInnogy-WTIV, GL

  • Self-Elevating (<45m water depth)
  • Self-Propelled
  • Crane 800t
  • DP2 Capability
  • 100 x 40m

GL-Deliverables

  • Analysis and Verification
  • Newbuilding Classification
  • Plan Approval
  • Newbuilding Supervision

Source: RWE Innogy

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presentation title | 2011-06-20 | No. 11

Design Concepts WTIV - Generation III

Beluga Hochtief Offshore TIS, GL

  • Self-Elevating (<50m water depth)
  • Self-Propelled
  • Crane <= 1500t
  • DP2 Capability
  • 135 x 43 m

GL-Deliverables

  • Analysis and Verification
  • Newbuilding Classification
  • Plan Approval
  • Newbuilding Supervision

Source: beluga-hochtief-offshore.com

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presentation title | 2011-06-20 | No. 12

Design Concepts WTIV - Generation III

Source: Swire Blue Ocean

Swire Blue Ocean WTIV, GL

  • Self-Elevating (<60m water depth)
  • Self-Propelled
  • Crane <= 1200t @ 31m
  • DP2 Capability, 13 knots
  • 155 x 49 m

GL-Deliverables

  • Analysis and Verification
  • Newbuilding Classification
  • Plan Approval
  • Newbuilding Supervision
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presentation title | 2011-06-20 | No. 13

Challenges in design of Wind Turbine Installation Vessels (WTIV) Basic Factors

wind turbine size water depth distance from shore

  • ptimization of given weather

window

Questions to be answered

self propelled / no propulsion / fuel type? jacking / non jacking? large deck area for working? sailing speed size of crane and lifting appliances? Accommodation? Dynamic Positioning?

what is the best design to meet the requirements best?

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presentation title | 2011-06-20 | No. 14

Rules and Regulations – A Class Challenge

  • Is it a ship?
  • Is it a jackup?
  • Is it a heavy lifter?
  • Is it a passenger vessel?
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presentation title | 2011-06-20 | No. 15

Rules and Regulations—Statutory

  • SOLAS 74/88, International Convention for Safety of Life at Sea 2009
  • ILLC 66/88, International Convention for Load Lines; Revision 2004
  • MARPOL 73/78, International Convention for the Prevention of Pollution from

Ships, Annex I – IV

  • IS Code 2008, International Code on Intact Stability
  • Guidelines for the Construction and Design of Offshore Supply Vessels 2006
  • Code of Safety for Special Purpose Ships, 2008
  • Code for the Construction and Equipment of Mobile Offshore Drilling Units,

1989 amendment by Res. MSC.187(79) 2004

  • Ballast Water Management Convention, 2004
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presentation title | 2011-06-20 | No. 16

In-between the rules

  • MODU Code in jacked position vs.

SPS Code in floating condition

  • Mining Authorities vs.

Coastal Flag State Authorities

  • Intact Stability Code / Weather criterion
  • SPS Code 2008 / Safe return to port requirements

GL activities

  • Roadmap through regulation – jungle
  • Active member in IMO working groups
  • Proactive partner with close contact to Flag State Administrations
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presentation title | 2011-06-20 | No. 17

Rules and Regulations - Two sets for Classification

  • GL Rules for Classification and Construction, Ship

Technology, Seagoing Ships

  • GL Rules for Classification and Construction,

Ship Technology, Offshore Service Vessels including class notation WTIS for Wind Turbine Installation Vessels

  • GL Rules for Classification and Construction,

Industrial Services, Offshore Technology

  • GL has established Rules for Mobile Offshore

Units

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presentation title | 2011-06-20 | No. 18

Rules and Regulations - Two sets for Classification

  • The term Offshore Engineering part considers the following components:

Legs, Leg Wells, Jacking unit incl. gears, guides, rack chocks (if applicable), steel categorization.

  • In addition, the global strength of the vessel for the elevated condition needs to be
  • analyzed. Overturning stability, pre-load capacity and fatigue requirements are to be

covered by the Offshore Engineering Part.

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presentation title | 2011-06-20 | No. 19

Rules and Regulations—Structure It would not be considered to install wind turbines in areas with high probability for low wind speeds.

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presentation title | 2011-06-20 | No. 20

Significant wave heights Limits for Lifting of Jack-up

Time Window for Lifting with Design Wave: Hs=1.0m -> 38% of the year possible Hs=1.5m -> 59% of the year possible Hs=2.0m -> 77% of the year possible

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presentation title | 2011-06-20 | No. 21

Independent Dynamic Global Structural Analysis (Survival & Operating Loading Condition)

Check of

  • Overturning Stability
  • Leg Strength
  • Jacking Capacity
  • Structure around Leg Well

Results:

  • Tubular Legs with Pin/Hole Jacking System: Leg Strength is governing
  • Lattice Legs with Rack/Pinion Jacking System: Jacking Capacity is governing
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presentation title | 2011-06-20 | No. 22

Jacking System

Rack/Pinion System:

  • Number of jacking cycles are much higher compared to Drill Units Fatigue
  • High loads arise also during operation condition (crane operation)
  • Use of rack chock system is not always planed
  • Additional crane load not considered (Crane around Leg Design)

Pin/Hole System:

  • Bearing pressure in hole requires high strength steel quality (>500 MPa), large pipe

wall thickness (t>80mm) as well as large pin diameter

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presentation title | 2011-06-20 | No. 23

Conclusion

1. The offshore wind market is a new market and experience is missing:

  • Ship designer are starting with Jack-up designs
  • Yards are building the first Jack-up
  • Ship operators are entering the offshore wind market

2. Need for a suitable IMO regulation (MODU, SPS, Stability) 3. Thoroughly planning of a newbuilding WTIV according to the market needs 4. Owner/designer should contact as early as possible the flag state for their special requirements for a newbuilding WTIVs (MODU/SPS-Code) 5. Control of Wear at Jacking System (especially Rack/Pinion) 6. Current WTIVs Jacking Systems with Crane around Leg Design does not consider increased leg load at crane leg

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GL Contacts:

GL-Hamburg Tel: +49 40 36149-Ext Email: FirstName.LastName@gl-group.com Thomas Jahnke (Speaker, Struc. Engineer Offshore Installations) Ext: 106 Ulrich Hachmann (Head of Department Offshore Installations) Ext: 267 (structural matters) Rasmus Stute (Head of Department Offshore Service Vessels) Ext: 7419 (class matters) Christoph Witte (Head of Department Project Management) Ext: 7534 (statutory matters)