dnv offshore substation safety
TRANSCRIPT
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Offshore Substation Safety
Thomas BoehmeDet Norske Veritas (DNV), London
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Det Norske Veritas Slide 2BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Industry Development Offshore wind farms become
bigger and are located further outin the sea
offshore platforms needed
-AC transformer- DC converter- accommodation
Periodic/permanent manning ofplatforms for maintenance and
inspection
understand and manage
associated risks
Current offshore guidance focuseson oil & gas installations
different risk profile in offshore
wind farmsRobin Rigg Picture source: DNV
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Det Norske Veritas Slide 3BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Substations Locations
BorWin I
Gunfleet Sands
Horns Rev I
Nysted I
LillgrundHorns Rev II
Q7
Robin Rigg
BarrowAlpha Ventus
Nysted II
Baltic I
Kriegers Flak
Nordergrnde
Borkum Riffgrund
Bard Offshore I
Bligh Bank
Thornton Bank
Greater Gabbard
Thanet
London Array
Lincs
Docking Shoal
Race Bank
Gwynt y Mr
Walney
Ormonde
Sheringham Shoal
Existing substationPlanned substationHVDC converter station
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Det Norske Veritas Slide 4BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Hazards Health & Safety
- Fire and explosion-Access, egress and transfer- Work at height- High voltage- Dropped objects / swinging loads- Electromagnetic fields
Environment- Transformer oil spill- Diesel oil / aviation fuel spill
Asset- Main component fault- Ship collision- Fire and explosion
Horns Rev I Picture source: Elsam/Eltra
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Det Norske Veritas Slide 5BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
(Accident) History and Requirements
Major accidents lead to new legislation Offshore wind industry must avoid any major accident be proactive
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Det Norske Veritas Slide 6BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Joint Industry Project
Partners
Industry input for various specialist topics Information and review
- Health & Safety Executive, UK- Danish Energy Authority, Denmark- Directorate for Civil Protection and Emergency Planning, Norway- Minerals Management Service, USA
Special contributions:
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Det Norske Veritas Slide 7BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Project Execution
Compile background data (Oct 2008)- Existing standards and design codes- Participants experiences and best practice- DNVs experience
Identify and evaluate hazards (HAZID), mitigaterisks
- Facilitated meetings with participants Develop specific design recommendations
- Performance (risk) based approach (lessprescriptive)
- Supported by relevant information from standards- Checked against latest research / developments
Review (mid Jul early Sep 2009)
- DNV / JIP participants / external Issue DNV-OS-J201(Oct 2009), project report
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Det Norske Veritas Slide 8BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Design Issues: Arrangement
Transformer platform,
normally unmanned(5 operational platforms and majority of
planned projects)
Note: Significant daytime manning during
first 6 ... 24 months
Transformer platform,periodically or permanently
manned(e.g. Bard Offshore I, Germany, 2010/11)
Separate transformer andaccommodation platforms(e.g. Horns Rev II, Denmark, 2009)
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Det Norske Veritas Slide 9BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Layout to meet functional andoperational requirements
- Segregation of areas- Location of equipment- Workplaces, welfare
Structural design- Loads and load effects- Structural analysis, vibrations-Attention: ship collision, crane use
Electrical design- Various applicable codes- Lack of offshore-certified HVequipment
Alpha Ventus Picture source: DOTI
Design Issues: Structural / Electrical
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Det Norske Veritas Slide 10BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Design Issues: Others
Fire and explosion protection- Transformer fire/explosion perceived as
highest consequence
- Fire safety engineering optionAccess and transfer
- Perceived as highest risk- Boat vs. helicopter- Stairs vs. ladder
Emergency response- Design and procedures
Construction and maintenance
- Minimisation of offshore work- Consideration of O&M at design stage
Picture source: Undisclosed oil & gas platform
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Det Norske Veritas Slide 11BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Conclusions
Offshore substations essential partof large wind farms
Not everything from oil & gastransferrable, but lessons can be
learned
- Offshore environment- Structural design- Safety
Key areas for improvement- Design for reliability- Interface management-Construction management
- Incident reporting, safety culture
Lillgrund Picture source: Siemens AG
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Det Norske Veritas Slide 12BWEA 31, Liverpool, United Kingdom, 20-22 Oct 2009
Safeguarding life, propertyand the environment
www.dnv.com