![]() ![]() The results of the survey among the participants showed the speech of Dipl.-Ing. Ulrich Uphues ' Maintenance Free Bolting Solutions' was well received. Uphues presented the results of a 18-month long-term study of 2.5 MW wind turbine tower bolts and did not forget to implement practical recommendations how to design bolted joints. The long-term study was based on valid results from the use of the ultra-sonic bolt measurement system (USB-System). Concluding all facts Uphus showed that all measured preloads were above the required minimum target preloads by using IHF Fasteners together with ITH Bolt Tensioning Cylinders. That precision is the reason why maintenance intervals on these bolt connections can be called 'Maintenance free'. Reduced maintenance intervals lead to significant cost reductions - especially on offshore applications. ![]() No wonder: This guideline VDI 2230 contains fundamental calculations, methods and rules for the technical design of bolted joints. The VDI is the German Association of Engineers (Verein Deutscher Ingenieure) and well-recognized for their work in standardization. Lori gave both competent and first-hand information, as the print-version of the VDI 2230 will be released not until December 2014. ![]() Part 1 Focuses on the systematic calculation of cylindric single bolt connections (ESV). ![]()
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