dnv offshore substation safety

7/29/2019 DNV Offshore Substation Safety

1/12

Offshore Substation Safety

Thomas BoehmeDet Norske Veritas (DNV), London


2/12

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


3/12


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


4/12


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


5/12


(Accident) History and Requirements

Major accidents lead to new legislation Offshore wind industry must avoid any major accident be proactive


6/12


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:


7/12


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


8/12


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)


9/12


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


10/12


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


11/12


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


12/12


Safeguarding life, propertyand the environment

www.dnv.com

dnv offshore substation safety

Documents