The Netherlands: Damen Develops Single Weld Nozzle Spinning Method
Damen Marine Components (DMC) has developed a pioneering nozzle production method bases on a single weld seam on the inner side of the nozzle. This makes the process much more efficient and environmentally friendly. The new Nozzle Spinning Machine can deliver nozzles up to 4.5 m at short notice.
Based in Hardinxveld in the Netherlands and part of the Damen Shipyards Group, DMC has invested in new spinning machinery for its facility in Gdansk.
Mr Steef Staal, DMC Managing Director, says: “The new spinning machinery, developed in the past two years, makes the production of nozzles much easier and gives an improved end product, because there is only a single weld seam on the inner side of the nozzle. Manufacturing the complete inside of a nozzle in one go is very special. This machine can produce any nozzle profile in every diameter and without the need for auxiliary tools.”
The spinning machine can produce nozzles with an inside diameter ranging from 1,000 mm to 4.5 m. Using a completely automated system, the machine can handle stainless steel, duplex, steel and special steel materials. The new machine is also able to handle the demand for shorter delivery times, emphasizes Mr. Staal. “Uncertainty in the market often means that companies order equipment at the very last minute and this means that lead times and delivery times are getting shorter. With this machine we adapt to that process.”
Under the traditional construction method, the inner side is constructed from several small welded parts. This is now history and the new method results in a much smoother surface. The new machine is already proving very successful with both existing and new customers.
Propeller nozzles are a sustainable product by definition, because they significantly reduce fuel consumption and thus cut down on CO² emissions. However, the new production method is even more environmentally friendly. “Because there is less welding and grinding this method saves energy and emissions,” Staal says. In addition, the new machinery saves production time and enhances our stable price/quality ratio, making it more cost efficient.
In addition to producing nozzles, DMC advises customers on various related topics, e.g. nozzle installation methods, in order to deliver a comprehensive solution to its customers.
Damen Marine Components (DMC)
DMC (part of the Damen Shipyards Group) develops, constructs and supplies high quality propeller nozzles. The company typically produces 600 to 700 nozzles a year. A whole range of profiles are developed in-house, delivering higher efficiency under various operating conditions.
Damen Shipyards Group
Damen Shipyards Group (est. 1927) is a globally operating company with 37 owned shipyards and numerous partner yards. Damen employs over 6,000 people, has built over 5,000 vessels worldwide and delivers up to 150 vessels annually. Based on its unique, standardised ship-design concept and short delivery times, Damen is able to guarantee constant quality.
Damen’s focus on standardisation and modular construction approach lead to short delivery times (Damen keeps vessels in stock), low ‘total cost of ownership’, high resale value, proven technology and reliable performance. Damen offers a wide range of products, including: tugs, workboats, patrol vessels, high speed craft, cargo vessels, dredgers, offshore support vessels, oil-spill response vessels and even frigates and mega yachts. In addition to shipbuilding, Damen offers efficient customer support, customer financing and complete lifecycle service.
Dredging Today Staff, March 8, 2012; Image: damen