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Part 1 Focuses on the systematic calculation of cylindric single bolt connections (ESV).

Lori gave both competent and first-hand information, as the print-version of the VDI 2230 will be released not until December 2014. The VDI is the German Association of Engineers (Verein Deutscher Ingenieure) and well-recognized for their work in standardization. No wonder: This guideline VDI 2230 contains fundamental calculations, methods and rules for the technical design of bolted joints. Reduced maintenance intervals lead to significant cost reductions - especially on offshore applications. That precision is the reason why maintenance intervals on these bolt connections can be called 'Maintenance free'. 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. The long-term study was based on valid results from the use of the ultra-sonic bolt measurement system (USB-System).

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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.

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Ulrich Uphues ' Maintenance Free Bolting Solutions' was well received. The results of the survey among the participants showed the speech of Dipl.-Ing. It is determined while taking into account the tightening and adjusting techniques and if need be the coefficient of friction classes (Table A5) according to Table A8.”.

Alpha-A factor, quote from VDI 2230: “The tightening factor Alpha-A takes into account the scatter of the achievable assembly preload between FMmin and FMmax.Hydraulic tensioning will also be considered in Table A8, which includes the tightening factors Alpha-A for all major bolting methods.Thererfore the guideline separates between bolt preload F VM (initial assembly preload, generated by bolt tensioning cylinder and a run-down nut) and assembly preload F M (residual assembly preload after releasing the pressure).The new and extra chapter 5 deals with ' hydraulic, friction- and torsion-free tensioning' with bolt tensioning cylinders.For the first time the VDI 2230 will clearly separate between 'turning' (torquing) and 'pulling' (tensioning) bolting methods.The system and process design of FEM calculation in general where updated as well, which are defined in VDI 2230 part 2. Mengklasifikasikan tujuan-tujuan dan sasaran- sasaran. Menegaskan sasaran dalam bentuk perilaku 4. Menemukan situasi dalam pencapaian tujuan 5.

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For this update new insights were used which came from a FEM-calculation (Finite element method). The calculations now consider special conditions of relative strength, bending loads and torsion loads of single bolt connections.

The updated part 1 also includes a higher level of precision designing of single bolt connections (ESV).

After that this one bolt connection can be calculated according to the definition in part 1. In this case designers need to idenfify the one bolted joint, which is subjected to the highest stresses.

NEW: Part 2 focuses on the systematic calculation of multiple bolt connections (MSV).

Willfried Lori's ' The updated guideline VDI 2230, part 2'. Nearly 80 participating engineers and technicians in the audience followed one lecture with very special interest: Prof. Readers a quick, fair and free method of dealing with complaints that they may have in relation to articles that appear on our pages. Tour groups 'pulling a fast one' are overrunning Cork's English Market.