Class’ Perspective on Wind Turbine Jack-up Vessels · 2018. 11. 9. · 6 MW 310 - 400 t 100 - 120m 300 - 500 t 3.6 MW ~ 185 t 75 - 90 m ~ 170 t 3 MW ~ 110 t 75 - 90 m ~ 110 t

Class’ Perspective on Wind Turbine Jack-up VesselsThe International Jack-up Barge Owners Association Meeting, Dartford21st June 2011, Speaker Thomas Jahnke (GL ND)

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


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


Offshore Windfarming development –deeper and further, Trend until 2025

North

ern E

urop

e

Southern Europe

Nor

ther

n Eu

rope

Source: EWEA.org

Current Projects

Planned Projects


Increasing Turbine Sizes and Weights

300 - 500 t100 - 120m310 - 400 t6 MW~ 170 t75 - 90 m~ 185 t3.6 MW

~ 110 t75 - 90 m~ 110 t3 MW

Tower WeightHub HeightNacelle Weight (incl. Rotor)Turbine Size

2.3 MW 3.6 MW Source: Siemens Wind Power

Already the world‘s biggest rotating machines


Foundations

1 2 3 4

1000 t~ 35 - 60 m~ 50 mTripod4

700 - 900 t~ 25 - 60 mup to 70 mJacket3

1000 - 1500 t~ 30 m Ø~ 20 mGravity2

600 - 700 t~ 4 - 5 m Ø~ 35 mMonopile1

Typical Weight Typical Size Typical Waterdepth

Type


Generation I Combined crane and working barges

Generation II Jackup barges without propulsion

Generation III Self-propelled Jackup vessels

WTIV Generation I to III


Design Concepts WTIV - Generation I


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


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


Design Concepts WTIV - Generation IIIBeluga 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


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


Challenges in design ofWind Turbine Installation Vessels (WTIV)

Basic Factorswind turbine sizewater depthdistance from shoreoptimization of given weather

window

Questions to be answeredself 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?


Rules and Regulations – A Class Challenge

• Is it a ship?• Is it a jackup?• Is it a heavy lifter?• Is it a passenger vessel?


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


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


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 Vesselsincluding 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


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.


Rules and Regulations—Structure

It would not be considered to install wind turbines in areas with high probability for low wind speeds.


Significant wave heightsLimits for Lifting of Jack-up

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


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


Jacking SystemRack/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 pipewall thickness (t>80mm) as well as large pin diameter


Conclusion1. 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 needs4. 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

GL Contacts:

GL-Hamburg Tel: +49 40 36149-ExtEmail: [email protected]

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)

Documents

Class’ Perspective on Wind Turbine Jack-up Vessels · 2018. 11. 9. · 6 MW 310 - 400 t 100 - 120m 300 - 500 t 3.6 MW ~ 185 t 75 - 90 m ~ 170 t 3 MW ~ 110 t 75 - 90 m ~ 110 t