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Analysis of nozzle-to-shell joint connected to the process piping
Ondráček, Marek ; Michálková, Anežka (referee) ; Pernica, Marek (advisor)
The diploma thesis focuses on the stress analysis of the nozzle-shell junction of a pressure vessel loaded with forces and moments from the connected process piping. The diploma thesis provides general information about pressure vessels, nozzles, piping systems, and details the various methods used for the calculations. The computational part of the diploma thesis focus on the stress analysis at the nozzle-shell junction of the pressure vessel, where the analyzed nozzle is connected to the process piping. The piping generates forces and moments on the nozzle, which must be considered in the stress calculations for this junction. The software Caesar II is used to calculate the forces and moments from the piping. For the stress analysis of the junction, the thesis uses several calculation methods, including the Welding Research Council (WRC) guidelines, PD 5500 standard, CSN EN 13445 standard, and the Finite Element Method (FEM). The objective of the thesis is to evaluate the outcomes of each method, compare them, and assess their approaches to calculating the stress at the junction between the nozzle and the shell of the pressure vessel.
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Residual life assessment of hydrogen adsorption vessel subjected to cyclic loading
Brančan, Peter ; Vincour, Dušan (referee) ; Létal, Tomáš (advisor)
There was a need to asses the residual life of a cyclically pressurized adsorber of PSA unit used for the separation of hydrogen gas from a feedstock mixture, of which designed lifetime according to outdated standart ČSN 69 0010-4.20 was exceeded. The maximum design life was determined according to more recent design codes by the methodology of fatigue curves and comparison of results of outdated standard and 3 newer standards: EN 13445-3 - clause 17 and clause 18, and ASME BPVC Section VIII Div.2 - Level 2 was made. Due to the exceeding of the design life results by all of the standards the alternative approach of Fitness for service method based on linear elastic fracture mechanics of crack growth with the assumption of the occurrence of non-detectable defect size was used. The crack growth parameters were adjusted according to the study of crack propagation in hydrogen environment and implemented into the calculation of API-579-1/ASME FFS-1 Fitness for Service standard. The results showed, that pressure vessel can be further operated if regular NDT inspections are made. Inspection intervals of critical positions were determined from these results with compliance to safety and, at the same time, the scope of inspections has been modified to reduce expenses of carrying them out.
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Inspection authorities of nuclear safety in the world and their purpose
Dvořák, Aleš ; Nerud, Pavel (referee) ; Šen, Hugo (advisor)
This thesis deals with issues of nuclear safety. The first section provides an overview of international organizations and associations, which control via their activities all regulations concerning nuclear safety, the technical state of equipments and systems in nuclear power plants. The second part deals with technical description of important equipment and systems of the nuclear powerplants at chosen nuclear reactors of II. and III. generation. The last part explains the conception of nuclear safety deeply. The reader can gain a deep overview of the different levels of protection and attention is also paid to the methods that contribute to the evaluation of nuclear safety.
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Influence of residual stress on pressure vessel part fatigue life
Boleloucký, Václav ; Vincour, Dušan (referee) ; Létal, Tomáš (advisor)
This bachelor’s thesis deals with the impact of a residual stress, caused by an applied cyclic pressure, on fatigue life of a pressure vessel part (flat end–cylinder connection). Bachelor’s thesis includes the design of the pressure vessel according to CSN EN 13 445 regulations, analytical solution in Maple software, from which stresses and deformations are determined. Then the results of the analytical approach are firstly verified by a FEM modelling in ANSYS Workbench software and secondly compared to each other in graphs and discussed. From the values of stresses in FEM, analysis fatigue life expectations are calculated with the respect to CSN EN 13 445 regulations, for two cases. First one, where a pressure test is applied and second one, where the pressure test is not applied before the pressure vessel is put into service. In the conlusion the obtained results are discussed.
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Software comparison for design and control of pressure vessels
Staňková, Lucie ; Pernica, Marek (referee) ; Lošák, Pavel (advisor)
The main goal of this thesis is to compare different software for pressure vessels design and control. This comparison is done by designing a given pressure vessel, specifically a heat exchanger. The heat exchanger is designed in software Sant’Ambrogio, Visual Vessel Design and PV Elite. Advantages and disadvantages of used software are discussed. Thesis evaluates various aspects of design, particularly graphic interfaces, user-friendliness, clarity and calculated results. The results for the cylindrical shell and the torispherical end of each software are analysed and compared to own calculations based on ČSN EN 13445 design code. Differences among results are explained. Thesis also contains the literature search report of pressure vessels design.
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Pressure vessels pressurized water reactors
Horváth, Radovan ; Martinec, Jiří (referee) ; Suk, Ladislav (advisor)
The aim of this bachelor thesis is the development of research on the topic of the pressure vessels of pressurized water reactors. Next is to outline the various design solutions of pressure vessels of pressurized water reactor. The thesis is divided into five chapters, contains 1 chart and 7 graphics. The theoretical part is dedicated to the history of nuclear energy and the development itself in the world. The description of the classifications of nuclear reactors is also included in the theoretical part. Summary of the theoretical part consists of a detailed description of the pressure vessel and pressurized water reactor itself. Practical part of this thesis contains the design of 3D assembly model and its modification in the program Catia V5. The overall model is composed of a main assembly, namely the body of the reactor and sub-assemblies, which were gradually installed.
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Design of column
Marko, Libor ; Buzík, Jiří (referee) ; Nováček, Filip (advisor)
The thesis contains information about the design of pressure vessels and describes their individual parts. It is mentioned production of individual parts and the process including assembly parts in one unit. The thesis includes options of control and testing of pressure vessels. It is described kinds of built-ins of distillation column and the basic principles and types of distillation. It is created stress analysis of pressure vessels parts according to ČSN EN 13 445 – 3, and also stress analysis of the selected part of column by using FEM. Mechanical drawing of distillation column is part of the thesis.
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Design of separator
Benda, David ; Nekvasil, Richard (referee) ; Lošák, Petr (advisor)
This diploma thesis deals with design of the gas separator according to the standard ČSN EN 13445. The design is based on the specified operating parameters and the basic dimensions, including the individual positions of the connecting flanges on the device according to the relevant schema. The assignment also includes the load of the nozzles from connected pipelines to the device. The analytical calculation of the design is performed in the commercial software NextGen with the analysis of the individual components used. Furthermore, some parts of the device are inspected in detail using the finite element method in the commercial software Ansys. The thesis also included the drawing documentation of the designed gas separator.
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Design of a two-phase separator
Brančan, Peter ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
Design of a two-phase separator according to the model assignment for separation of natural gas and crude oil. Material selection and checkup for functionality on this process equipment. Emphasis is on selection of dimensions according to mathematical model of mixture sepation. Design is also considering safety of the vessel. Dimensions of separator are optimalized to the lowest possible price of a vessel, while maintaining functionality and required safety of a pressure vessel. Separator is designed according to the standart ČSN EN 13445. Iteretion programs in computational software MATLAB were created to make calculations easier. Programs were created for calculations of separator’s dimensions, nozzles and their reinforcing pads, checking calculations of the vessel and its nozzles and calculations of flanges.
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