final project presentation - benjamin baertm120.emship.eu/documents/masterthesis/2014/baert...
TRANSCRIPT
Analysis of the Installation of a Series of Piles for Offshore Wind Turbine Foundations
28.02.2014 © 2014 UNIVERSITÄT ROSTOCK | NAVAL ARCHITECTURE AND OCEAN ENGINEERING
Final Project Presentation - Benjamin Baert
1
Pre-piling
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Pre-piling
Principle
28.02.2014 © 2014 UNIVERSITÄT ROSTOCK | NAVAL ARCHITECTURE AND OCEAN ENGINEERING
3
1. Jack-up platform (JUP) transit and positioning
2. Piling template lowering
3. Pile transfer
4. Upending and stabbing of piles
5. Pile driving
6. Pile survey
7. Piling template recovery
Analysis of the nett production time
Statistical Process Control (SPC) Charts
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Decision-making
Pile transfer (7 % of production time)
More critical weather limits.
Pile upending (31 % of production time)
Less critical weather limits.
New lifting arrangement Roller stands
Estimated time saving 32.9 h 32.9 h
Incl. waiting on weather (May) ? ?
Incl. waiting on weather (January) ? ?
28.02.2014 © 2013 UNIVERSITÄT ROSTOCK | NAVAL ARCHITECTURE AND OCEAN ENGINEERING
5
Waiting on weather (WOW)
• Critical weather limits
• Sufficient persistence
Suitable Weather Window
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Monte Carlo Simulation
• Based on historical weather statistics
• Calculation of completion date
Waiting-on-weather simulation
Output: probability distribution of number of completed locations per month
(abscissa: number of locations; ordinate: probability)
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Decision-making
Pile transfer (7 % of production time)
More critical weather limits.
Pile upending (31 % of production time)
Less critical weather limits.
New lifting arrangement Roller stands
Estimated time saving 32.9 h 32.9 h
Incl. waiting on weather (May) 33.6 h 33.4 h
Incl. waiting on weather (October) 38.6 h 33.6 h
28.02.2014 © 2013 UNIVERSITÄT ROSTOCK | NAVAL ARCHITECTURE AND OCEAN ENGINEERING
8
+ 17 %
Conclusion
Development of a tool to quantify the impact of waiting on weather
decision making
completion date
Serial installation requires continous optmization
SPC charts: define, measure, analyze, improve and control
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