This bachelor´s thesis deals with the design and assessment of flange joints with gasket. The first part defines term flange joint and its load. It surveys and assesses the possible alternatives of design solution. Mentioned is the issue of bolt connections with pretension, including force relations in the joint, determination rigidity of parts and their strength. In addition, analysis of the causes of bolts failures and their removal, methods of creating pretension. It gives an overview of the most widely used types of gaskets, their properties, application and definition of characteristic values of gaskets and their determination according to ČSN EN 13 555. Another section deals with the design process of flange joints, standards for the design, desired outputs and assesses analytical and numerical approach. Computational program was created in MS Excel 2007 for design calculation of flange joints according to ČSN EN 1591-1. Verification of the results was performed with calculation of identical models using finite element method (FEM) in ANSYS Workbench 14.0. Errors in standards formulas were submitted. In conclusion, the results obtained analytically and by FEM were assessed for a specific load conditions of gate valve DN 300. Camprofile (grooved) gasket with nonlinear material model was used
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