Winding up hydro with composite shaft bearings
Finnish technology company Wärtsilä has a long history in the marine business. Supplying bearings and seals in extremely high-performance applications, such as the UK’s nuclear submarine fleet, it believes it has impressive credentials in the long-term reliability that is a basic requirement for the hydropower industry.
This is the view of Ross Strickland, consultant engineer at Wärtsilä’s UK seals and bearings division, who explained some of the company’s strategic objectives while outlining the key features of the company’s latest offering for the hydropower sector - a hybrid composite bearing, housing and seal system for hydropower turbine shafts. “We’ve got some pedigree in that area. Having supplied stern shaft bearings for 50-odd years, we’re on 23 navies and supply to the MOD [UK Ministry of Defence],” says Strickland.
And for the company, the move into hydropower bearings and seals makes sense, adds Les Creak, UK-based business development manager for Wärtsilä’s Hydro and Industrial segment, noting that Kaplan turbines, for example, look all but identical to a ships’ controllable pitch propeller.
Following the July 2007 completion of the acquisition of Railko Ltd Marine Products, which was founded in 1957 and specialized in synthetic or composite stern tube and rudder bearing technology, Wärtsilä has expanded its capabilities, adapted the technology and applied it to the hydropower sector.
Composite technologies offer an alternative to white metal, bronze, wood and other materials that are currently applied in the hydropower sector and a number of other companies offer composite bearings.
Prior to the acquisition, net sales of the Railko’s marine business was about
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