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Vestdavit secures davit order for Esvagt's green fuelled SOV

By: Tom Russell 06/09/2022 Vestdavit

General Logistics Vessels Windfarms

Vestdavit has been selected by Esvagt to provide a total of five davit systems for its newbuild service operation vessel (SOV). The 'green fuelled' vessel is being built at Turkey’s Cemre Shipyard and will support operations and maintenance at Ørsted's Hornsea 2 offshore wind farm.

Powered by batteries and dual-fuel engines, the 93-metre long vessel will be capable of sailing on e-methanol produced from wind energy and biogenic carbon. According to Esvagt this leads to an annual reduction of CO2 emissions.

Vesrdavit will deliver two large FF-30000 dual-point workboat davits featuring a unique solution for flexible hook distance, as well as a pair of L-3500 liferaft davits and one PLRH-5000 davit for fast rescue craft.

The FF-30000 system, with heavyweight lifting capacity of 25,000 kilograms, has been specially adapted from an existing Vestdavit design to handle Esvagt’s newly in-house developed Safe Transfer Boat 15 (STB15), a workboat that is longer, wider and heavier than existing such craft used in the offshore wind sector.

The STB15 has a length of 15 metres, versus the industry standard of 12 metres, and is intended to provide a more stable and comfortable working platform for technicians servicing wind turbines, thus giving operational benefits.

The solution was to adapt the so-called F-frame (FF) system that comprises a large frame with no structure behind or underneath the daughter craft, which allows for greater flexibility in the shape and volume of the boat being handled, with the main structure aft/forward of the boat.

In addition, the FF-30000 has two lifting points for dual-point lifting of the daughter craft with a dual-winch system consisting of two winches each with autonomous tension function so they can operate independently of each other.

“But the greater dimensions and weight of this workboat pose handling challenges for existing davits to ensure that personnel and equipment can be deployed safely and reliably under variable sea conditions,” said Vestdavit’s Sales and Business Development Director, Bjørnar Dahle.

“Therefore, Vestdavit was required by the client to devise a more suitable technical solution based on the basic design and shape of an existing davit, while working within the structural and practical constraints of the ship design, which meant clearing several obstacles to find a workable concept.”

“This dual-point lifting functionality permits a wider weather window as the vessel can still launch and recover daughter craft even in rough sea conditions,” Dahle explains.

The aft lifting wire can be adjusted forward to cater for smaller boats with a narrower hook distance. This enables the system also to operate as a single-point davit from the aft lifting point to bring onboard the smaller and more available STB12 workboat as a temporary replacement for the STB15 if the latter needs to be serviced.

For everything you need to know about the strategies used to support the construction and O&M of offshore wind farms, current and future, including supply and demand for service and accommodation vessels, and helicopters - click here.

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Vestdavit secures davit order for Esvagt's green fuelled SOV

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