Anatec’s industry best-practice COLLRISK models are used to quantify collision (allision) risk with offshore installations.

COLLRISK has been extended to cover collision risks with offshore wind farm structures such as wind turbines, substations, booster platforms, artificial nesting structures etc.

All conceivable collision scenarios can be modelled including:

• 3rd Party Commercial Vessels
• Fishing Vessels
• Attendant Wind Farm Vessels during O&M

Attendant vessel collision risks (such as from CTV and/or SOV) which are key to structural design of installations to withstand operational and accidental loads, insured risk and safety management. Anatec’s modelling considers vessels on approach and entry to the array, planned work alongside installations, as well as unplanned risks when transiting within array.

Models are calibrated against the most up-to-date and appropriate incident data. Results would be reported in terms of annual collision frequency versus impact energy per structure. This can be used to evaluate compliance with acceptance criteria, such as the 1 in 50-year event within IEC 61400-3-1.

AIS data can be used for operational wind farms to monitor vessel activities and assess compliance with marine operating procedures and industry guidance. Detailed AIS analysis can be used for:

• Approach speeds and transit speeds in array
• Minimum passing distances to structures
• Final approach speeds and courses
• Time spent manoeuvring and alongside
• Adherence to COLREGS

Further checks can be conducted based on adherence to allowable weather limits, and effect of drift on / drift-off working conditions on approaches, speeds, steel-to-steel distances, etc.

Anatec’s review addresses issues highlighted in the HSE Safety Notice to the industry on risk of collision (ED01-2025) which included the example of an SOV colliding with a wind turbine as it transited through the array area.