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Next step in offshore maintenance made possible through new JIP


The Offshore Maintenance JIP aims to better quantify the O&M operability and associated costs for maintenance operations by taking vessel hydrodynamics and realistic operational limits into account in existing


Energy research Centre of the Netherlands (ECN) O&M cost models. Erik-Jan de Ridder, e.d.ridder@marin.nl


The main aim of the OM JIP is to come up with the most effective logistical scenario for each maintenance operation. Present O&M cost analysis models lack details about hydrodynamic vessel response and human response to vessel motions. Based on discussions amongst partners and with the industry it was concluded that there was an urgent need for a realistic logistics O&M model, which should include vessel characteristics and operational (human) criteria.


The project was initiated by MARIN (hydro- dynamics), ECN (operability and cost prediction model) and TNO (human factors) and got underway in 2015. Research is performed in close cooperation with the Carbon Trust from the UK, which represents most of the large energy companies in Europe that are active in offshore wind.


A considerable amount of research has been undertaken by the Carbon Trust which mainly focuses on the smaller Crew Transfer Vessels (CTV) involved in offshore mainte- nance. Friction between the fender on the bow of the CTV and the boat landing on the offshore wind turbine is an important para- meter in the operation. Therefore, the work consisted of extended fender friction tests both at model and full scale.


16 report


Furthermore, model tests with different CTV concepts were performed for the different stages of the operation such as transit, and approach and transfer All the data was then validated with detailed, full- scale monitoring of different CTVs in operation. The OM JIP can build even further on this large database, ensuring that there is no duplication of work. The research will now be extended to larger DP accommodation vessels equipped with access systems.


The OM JIP consortium consists of 14 differ- ent participants including research institutes, shipbuilders, OM operators, OM personnel, access system operators and utility compa- nies. Having such a diverse group involved in the research makes it possible to take the next step in offshore maintenance. New companies are still invited to join.


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