Windpark Q7 - Offshore project with the wind in its sails

Client / Project: Windpark Q7, Netherlands
Product: Supply lines for the wind turbines
Sizes: 12 and 14 inch
Order Volume: 1400 t
Coating / Lining:
Delivery: 2006

Offshore is a term that most people associate only with oil and natural gas. This will soon change, however, as wind power, having established itself on land, gradually spreads to the sea.

About 23 kilometres off the coast by IJmuiden, project Q7 is creating the first Dutch wind farm outside the 12-mile zone. Sixty wind turbines, each with an output of 2 megawatts, are being set up 550 metres apart in 19 to 24 metres of water. The 14 square kilometre wind farm is designed to feed 435 gigawatt hours of wind electricity into the grid each year. This is enough to supply 125,000 households with electricity, cutting carbon dioxide emissions by 225,000 tonnes. The construction phase of the second offshore project in the Netherlands after Egmond aan Zee commenced at the end of 2006. The farm is scheduled to start operating in the spring of 2008. The total investment will amount to about 380 million euros.

Salzgitter Mannesmann Line Pipe supplied about 1400 tonnes of 12-inch and 14-inch pipes, with wall thicknesses between 16 and 20 mm, for the project. In addition to the exacting strength and corrosion protection requirements, the pipes had to be thoroughly descaled internally, as the supply lines of the 60 Vestas V80 wind turbines pass through the flanged piles. Besides the quality of the HFI-welded pipes, trade partner Van Leeuwen Buizen was convinced above all by the favourable price, relative to seamless tubes, and the flexible production and delivery times of the pipes made at the Hamm site.

Wind energy is the kinetic energy of moving air masses in the atmosphere. It is an indirect form of solar energy and is therefore classed as renewable. Offshore wind energy has considerable potential for electricity generation, especially for the Netherlands. This is because of the high wind speeds along the coast. The Dutch government has set a target of installing a total of 6000 MW offshore wind energy capacity by 2020. This would cover almost 20 percent of current electricity demand. As a result, more than 60 more projects are in the planning stage.

Supply lines from SMLP
Supply lines from SMLP