Damen Shipyards and offshore wind services provider Purus Wind have signed a contract for the build and delivery of eight new vessels. The order involves seven Fast Crew Suppliers of two different types and one 90-metre Construction Service Operation Vessel.

The Fast Crew Suppliers (FCSs) ordered are four Damen FCS 2710 Hybrid and three FCS 3210 Hybrid Crew Transfer Vessels (CTVs).

The FCSs 3210 and the CSOV will not only be equipped for ultra-low emission operations, but they have also been designed to be upgraded to methanol-fuelled engines when the time comes. The order is part of Purus Wind’s strategy to be a leading provider of low-carbon, offshore wind support vessels to meet the needs of the clean energy industry as its members set out to decarbonise.

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Hybrid FCS

The new Hybrid FCSs 2710 will join the three other Hybrids that Purus Wind’s High-Speed Transfers ordered from Damen in the second half of 2022. The vessels will be updated with the latest design adjustments, such as an improved wheelhouse window arrangement and bridge console lay-out. The twin axe hull form ensures excellent stability and fuel economy as well as providing extensive deck space and accommodation.

The larger FCSs 3210 are a new design that use the same twin axe hull form and share many of the same attributes as the 2710s. As with the new FCSs 2710, a hybrid battery package for zero-emission sailing is integrated into the design. The greater length allows for additional space for crew and passengers, making it more comfortable during operations. Space is also reserved for possible conversion to methanol fuel.

An exhaust gas aftertreatment system is included to ensure that the vessels are IMO Tier III compliant. The FCSs 3210 are designed for longer distances serving wind parks further from shore and offer the possibility of staying longer at sea. High Speed Transfers has contributed its operational experience to the design and engineering of the FCS 3210 from the outset to ensure that it sets a new level of capability for its class.

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Construction Service Operation Vessel

The latest vessel in the 90-metre Damen Construction Service Operation Vessel (CSOV) Series will be highly versatile and capable of carrying up to 120 persons in comfort for up to thirty days at a time. In addition to the diesel-electric propulsion system and battery array, innovative features include a hull design that is almost symmetrical fore and aft below the waterline, on which will be mounted Damen’s DPX-Drive. This has four identical thruster units – two forward and two aft – for highly precise manoeuvring and station keeping.

Other features include excellent stability due to its design, which is further enhanced by a large anti-roll tank. A motion-compensated gangway and crane will also ensure smooth transfers of personnel and equipment. Like the CTVs, it has space reserved for additional battery capacity as and when it is required and will also be pre-prepared for both conversion to methanol engines and offshore charging.

Decarbonising offshore wind operations

‘These vessels will support a pathway for our clients to decarbonise their operations and to maintain our position as a leader with the lowest carbon offshore wind support fleet,’ says Tom Nevin, CEO of HST and Business Head of Purus Wind. ‘We are incredibly pleased to be continuing our relationship with Damen, having been the launching client for the FCS 2710 and the FCS 2710 Hybrid, and now the FCS 3210 Hybrid. We are also very excited about the potential of what will be our first hybrid vessels with the ability convert to methanol.’

The new vessels are scheduled to be delivered between 2024 and early 2027.

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