Rethinking offshore operations
The world needs greener energy, but high costs are a barrier. Raw material and equipment prices have more than doubled, halting many projects. Can we reduce the financial risk of developing offshore wind farms and make walk-to-work (W2W) operations more affordable?
SOVs are the most efficient and preferred solution today for servicing offshore wind turbines, outperforming CTVs in safety, availability, and comfort. However, rising shipbuilding costs and newbuild delivery times threaten their viability. CTVs, on the other hand, face tougher requirements, such as slower speed in protected areas and reduced emissions.
Economies of scale have mitigated costs for SOVs, raw materials, and wind farm development, but relying solely on large wind farms is not sustainable. Designing smaller SOVs alone is insufficient; a new approach to operations and vessel conceptualisation is essential.
The ULSTEIN SX250 – Walk-to-work vessel- The ULSTEIN SX250 is based on the proven TWIN X-STERN solution.
- Alternative topside configuration on the ULSTEIN SX250 with 1 off Palfinger OPTS and 1 off daugther craft
- Two ULSTEIN SX250 working along with an ULSTEIN SX222 CSOV
The ULSTEIN SX250: Reducing CAPEX and OPEX while maintaining high operational scope
Ulstein's design team aimed to develop a walk-to-work vessel that reduces vessel CAPEX by at least 50% compared to an SOV, reducing OPEX accordingly, while retaining the majority of the key functionalities and operability.
The result is the ULSTEIN SX250.
The ULSTEIN SX250 transforms offshore wind farm servicing by bridging the gap between CTVs and SOVs, introducing new service logistics. One or more SX250 vessels can support a full-sized SOV, the latter handling larger tasks while two to three SX250 vessels manage the smaller jobs. This setup meets service requirements and maintains the necessary up-time and it allows for more detailed operational planning and distribution of workload. The ULSTEIN SX250 design is best suited as the preferred solution for small and medium-sized windfarms, windfarms located in areas with benign and moderate sea states, or in shallow waters. ULSTEIN SX250 is also a perfect supplement to cater for the additional maintenance activities typically carried out during the summer campaigns.
Dictionary: OPEX (operating expenditure) covers the daily business expenses, while CAPEX (capital expenditure) involves investments in long-term assets.
The ULSTEIN SX250 is based on the proven TWIN X-STERN solution, which ensures high operability and excellent seakeeping capabilities. It measures 47 meters in length and 12.5 meters in width, accommodating between 32 to 40 individuals on board (POB). The vessel has a maximum speed of 10 knots and can operate in conditions of up to 2 meters significant wave height (Hs).
Safety is a major focus, with people and goods transferred via a basket in an Offshore Passenger Transfer System (OPTS), Bring-to-Work System, or conventional gangway.
Flexible topside solutions
The vessel can be customised with different arrangements and topside equipment, allowing it to adapt to various operational needs and making it easy to repurpose for new tasks. The vessel concept design relies on existing off-the-shelf hardware and technologies to ensure effective W2W operations while reducing CAPEX and OPEX.
Depending on operational needs, various setups can include a gangway system for personnel/goods, a daughter craft, a deck storage container, a work or observation ROV, or a fast rescue craft/workboat.
The ULSTEIN SX250 is designed to meet the needs of the offshore wind service industry, offering a cost-effective and versatile solution. It is also more environmentally friendly, significantly reducing material consumption during the shipbuilding phase compared to a Service Operation Vessel (SOV). Additionally, it lowers fuel consumption during operations. Its reduced energy consumption facilitates the transition to zero-emission operations by enabling the integration of alternative fuels.
By reducing its environmental footprint, the ULSTEIN SX250 aligns with the industry's push towards more sustainable operations.
Mind the gap – with ULSTEIN SX250
The ULSTEIN SX250 offers a smarter, more flexible, and sustainable solution for walk-to-work operations in offshore wind and oil & gas industries, bridging the gap between CTVs and SOVs.
Reach out if you would like to know more about the ULSTEIN SX250.
