All-electric Rotork package selected for offshore wind farm

Source: Rotork
All-electric Rotork valve control package selected for offshore wind farm

Rotork is supplying an all-electric valve actuation package encompassing isolating, regulating and modulating actuators with two-wire digital control for the DanTysk offshore wind farm in the North Sea.

Almost one hundred Rotork quarter-turn electric actuators will control butterfly valves on the DanTysk transformer platform, situated 70 kilometres west of the German island of Sylt. The contract includes fitting the actuators to the valves, which has been performed prior to delivery at the specialist actuation workshop facilities attached to Rotork Holland, where the order was won.

Approximately half the actuators are IQTPro intelligent isolating and regulating duty units, the balance comprising CVA fully modulating control valve actuators. Both designs share advanced and user friendly non-intrusive programming and commissioning technologies, combined with comprehensive integral data logging, diagnostic and asset management capabilities. Rugged, double-sealed IP68 watertight and explosionproof enclosures enhance long-term reliability in the harshest of environments, as can often be encountered in offshore applications.

Rotork CVA electric actuators deliver continuous, repeatable modulating control with a programmable fail to position option. Resolution, repeatability and hysteresis performance is quoted at less than 0.1% of full scale, offering suitability for the most demanding control valve applications.

Digital two-wire control is provided by Rotork’s proprietary Pakscan P3 system, the third generation of a market-leading product, capable of monitoring and controlling up to 240 field units without repeaters on a single highway with a length of up to 20 kilometres. Designed specifically for the valve actuation environment, Pakscan incorporates secure field communications with inbuilt network redundancy to maintain control even in the event of equipment or cable failure. On the DanTysk project the Pakscan network master station will link the actuators to a distributed control system and to a remote, centralised monitoring centre situated at Esbjerg in Denmark.

The DanTysk offshore wind farm is a joint venture between Vattenfall and Stadtwerke München (SWM). On completion of the €1 billion project at the beginning of 2014, eighty wind turbines with a capacity of 288MW will supply electricity for up to 400,000 households. Rotork’s involvement follows a similar North Sea offshore wind farm contract in 2011, also supplied by Rotork Holland, when IQTPro actuators were specified for the Borwin Alpha transformer platform, serving the BARD Offshore 1 wind farm.

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