Lessons Learned with Offshore Windfarms and Converter Stations Claims Property & Engineering Petrus Knollmueller Munich,

Transcription

1 Lessons Learned with Offshore Windfarms and Converter Stations Claims Property & Engineering Petrus Knollmueller Munich,

2 Agenda Petrus Knollmüller Claims Property & Engineering Lessons learned process at AGCS Evaluation of claims data Claims examples at offshore structures Dr. Thomas Griggel Allianz Center of Technology Trends for turbines Lessons learned for the drive train Oliver Höck Risk Consulting Engineering Offshore converter stations Sea cables 2

3 Lessons learned process at AGCS Internal systematic approach using AGCS technical know-how and capabilities to identify and multiply lessons learned internally and externally Summary Learning from individual losses as well as from loss statistics Internal discussion and clustering lessons learned in different categories Lessons learned In-depth analysis Risk consulting Underwriting Minimising the risk together with our clients! Claims assessment 3

4 Introduction to wind offshore claims analysis Analysis from insurance perspective provide a glimpse and not a holistic scientific view because of the different policies involved and policy conditions 100 Basis for analysis: AGCS claims data Amount of claims [%] Transport Erection Commissioning Maintenance Conventional Wind Offshore Cargo movement as additional major risk within wind offshore erection all risk policies In comparison to conventional power plant projects claims accumulation shift towards erection phase Till now only small amount of claims from operational covers (not significant for an indepth analysis) 4

5 Comparison subsections Comparison of claims for different wind offshore subsections during erection Wind turbine generator Cable Substation Other Basis for analysis: AGCS claims data Absolute values Relative amount Amount Value Amount of claims Claims involving wind turbine generators count 50 % of all losses Overall cable claims most significant cost driver Human error (e.g. wrong handling) accounts for more than half of all losses Natural hazards are insignificant Claims at structures most significant cost driver for subsection WTG and substation 5

6 Claims example at offshore structures Wind turbine generator: Monopiles with flange connection Anvil Pile sleeve 1 Monopile head Welded positioning plates 2 3 Positioning plus afterwards lowering of hammer Slight inclination of hammer (e.g. wind, residual oscillations) 1) Piles are rammed into seabed with a hammer with a variable anvil Use of positioning plates to adapt to different pile diameters 2) During lowering plates sheared off and got stuck between hammer and flange 3) Consequential hammering led to a local overload at monopile Market generally aware of risk and remedial measures in design are addressed at insurance tenders by our risk consultants. 6

7 Claims example at offshore structures Substation: Jacket structure with grout connection Upper Pile centralizer A Pile Pile sleeve A 1 2 Grout annulus Bottom Pile centralizer Grout seals 1) During lowering of pile shearing off of grout seals 2) After injection of grout, grout escaping from underneath the pile sleeve A) Design flaw (tolerances not considered appropriately) Analyzed together with subcontractor of our client and subcontractor changed specification sheets as well as improved internal quality management in construction. 7

8 Key Take-aways Learning from losses together with our clients Claims occuring mainly in erection phase of EAR projects Till now only small amount of claims from operational covers EAR projects Cable claims most significant cost driver For wind turbine generator, claims at structures most significant cost driver Human error (e.g. wrong handling) accounts for more than half of all losses Natural hazards are insignificant 8