Polyurethane Coating Relest Wind LEP
Shelter from the Wind and Storm
The rotor blades of wind power plants have to withstand enormous loads: Velocities of up to 300 km per hour are sometimes reached at the blade tips. And there is impact from rain, hail, snow, sand and UV radiation. Particular load acts upon the edges of the rotor blades. This is because rotor blades – which are mostly between 40 and 60, but sometimes even up to 90 meters long – consist of several components connected to each other. They are adhesion bonded, with the bond seam exactly at the blade edge. To protect the edge from erosion, sand and water, BASF SE, Ludwigshafen, developed the new Relest Wind LEP product. This new generation of polyurethane coating is due to protect the sensitive area of the rotor blade better than the known products.
Tests performed to determine the resistance to erosion by rain showed the high protective effect of the varnish. The values achieved by Relest Wind LEP are up to four times higher than those of the usual solutions currently available at the market. To investigate resistance to erosion by rain, BASF uses a test stand designed for the purpose, situated at their Oldenburg site. The data supplied is realistic. The test specimens rotate on special fixtures in the test stand, reaching speeds up to 500 km/h. At this speed, water drops are introduced into the test stand (approx. 30 l/h), to impinge upon the test specimen. This is how the test assembly, in a way very close to practical use, reproduces the actual conditions that exist on the rotor blades.
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