Case story | VLT® Marine From installer to contractor to shipyard Danfoss VLT® expertise saves time and energy M/V ISLAND PERFORMER Subsea Vessel from Ulstein Verft shipyard 36 VLT® drives control the seawater cooling system, cargo delivery system and HVAC applications. Photo: Ulstein Group/ Marius Beck Dahle Ulstein Verft shipyard and AF Offshore Aeron AS chose Danfoss VLT® drives to control the seawater cooling system, cargo delivery system and HVAC applications in their stateof-the-art subsea vessel, ‘Island Performer’. Danfoss were selected not just for the uncompromising quality, reliability and efficiency of their VLT® drives, but for their expertise during the installation and programming of the drives. A history of successful co-operation Ulstein and AF Offshore Aeron AS have had a long termrelationship of more than 10 years and are extremely satisfied with the Danfoss products and technical support. Around 10 to 15 years ago, all motor were DOL driven. Ulstein were among the first to use drives for cargo pumps on PSV’s - now they have started using drives for ballast water and seawater cooling systems. Danfoss drives have consistently delivered to specifications and expectations – and continue to be used in cutting edge vessels such as ‘Island Performer’. The height of technology for the ocean’s depths ‘Island Performer’ is the next generation subsea vessel from Ulstein Verft shipyard, with large accommodation, storage and lifting capacities. Built to provide offshore installation and construction services for subsea umbilicals, risers and flowlines and to perform riserless light well intervention and inspection, maintenance and repair works, she is able to perform operations at depths down to 3,000 meters. Precision, safety and efficiency are obviously paramount in this extremely challenging working environment, but personnel comfort has also become increasingly important. The role of air-conditioning plays an increasingly important role. Danfoss VLT® drives save energy By using Danfoss VLT® drives in the seawater cooling and air-conditioning systems, energy consumption on board is reduced. By reducing the speed of the seawater cooling pumps, cavitation in the cooling system is also reduced. “Seawater cooling systems are normally designed for 32° C seawater temperatures. But for vessels such as ‘Island Performer’, which can frequently operate in cooler areas such as The North Sea, this is over-dimensioned when it comes to vlt-marine.danfoss.com
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