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A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis
Dissertation (MEng)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2016
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| _version_ | 1867613534345494528 |
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| access_status_str | Open Access |
| author2 | Theron, Nicolaas J. |
| author_browse | Theron, Nicolaas J. |
| author_facet | Theron, Nicolaas J. |
| collection | Thesis |
| dc_rights_str_mv | © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/56085 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:40.523Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/56085 A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis Theron, Nicolaas J. u28012942@tuks.co.za Pietra, F. Luyt, Ian Christiaan Berning UCTD Flat face flange Raised face flange Flange with an O-ring groove Flange rotation Creep-relaxation Contact pressure Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Dissertation (MEng)--University of Pretoria, 2015. There is currently a need for large diameter flanges for the supply of water in South Africa. These large diameter pipe flanges are required to accommodate pipes with nominal bores of up to 4 m and should successfully withstand internal pressures of up to 8 MPa. No current relevant standard / code contains prescribed design values for flanges which either operate at such high pressures or have such large diameters. Due to this an alternative method of design, by means of non-linear finite element modelling, is proposed. Three types of integral flange designs are considered, namely: flat face, raised face, and a modified raised face with an O-ring groove. The effects of creep-relaxation, flange rotation, and the bolting sequence are considered. For each of these designs a finite element model was created and compared to a small scale experiment which included strain and contact pressure measurements. The proposed non-linear finite element models were capable of accurately predicting the strains in the flanges as well as the contact pressures between the faces of the flange and the surfaces of the packing material. Finally, a comparison between the ASME design method and the proposed non-linear finite element modelling design method was done for the large diameter flanges. It was found that the ASME design code did not have the ability to accurately predict the stresses in the flanges. It was also found that by using the maximum equivalent Von Mises stress as failure criteria for the flanges and fasteners, and contact pressure for the sealing ability, circular bolted flange connections which are lighter, safer, and leak tight could be designed by means of the proposed non-linear finite element models. tm2016 mi2025 Mechanical and Aeronautical Engineering MEng Unrestricted SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-07: Affordable and clean energy 2016-07-29T11:01:59Z 2016-07-29T11:01:59Z 2016-04-15 2015 Dissertation Luyt, ICB 2015, A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/56085> A2016 http://hdl.handle.net/2263/56085 en © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Flat face flange Raised face flange Flange with an O-ring groove Flange rotation Creep-relaxation Contact pressure Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title | A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title_full | A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title_fullStr | A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title_full_unstemmed | A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title_short | A leak tight design methodology for large diameter flanges based on non-linear modelling and analysis |
| title_sort | leak tight design methodology for large diameter flanges based on non linear modelling and analysis |
| topic | UCTD Flat face flange Raised face flange Flange with an O-ring groove Flange rotation Creep-relaxation Contact pressure Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy |
| url | http://hdl.handle.net/2263/56085 |