Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom
2018
Authors
Martić, IgorContributors
Jarić, MarkoSedmak, Aleksandar
Mitrović, Nenad
Rakin, Marko
Radaković, Zoran
Doctoral thesis (Published version)
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The applied stress level which will produce plastic deformations in WM is lower than the BM yield strength, not to mention effect of over-loading. One should also keep in mind that welded joints are places with non-uniform stress distribution because of stress concentration even if residual stresses are released. Therefore, simultaneously introduced different influencing factors will produce difficulties for stress calculation of welded joints, so that the design of pressure vessels becomes more complicated than usual. Sometimes, it is inevitable to test the produced pressure vessel, using different techniques, needed for stress calculations and assessment of weldments behaviour under different service conditions.
Reversible HPP (RHPP) “Bajina Basta” is in operation since 1982, [2]. Taking into account that the failure of the most critical part, the pipeline (Fig. 1), would cause water overflow of the surge hub in the surrounding area, and the collapse of the entire plant, it is clear... that special attention is still need to prove its structural integrity [3]. One of the most important effects is the proof testing, i.e. over-pressure, which is the main concern in this paper. Namely, there is a history of welded joint failures due to proof testing, e.g. spherical pressure vessels for liquefied natural gases (LNG) [4], caused by unnecessary plastic deformation acting as crack initiation and propagation mechanism. Some details are given below, as taken from monograph [3]..
It is shown, using different approaches, that the effect of over-pressure is detrimental from the point of view of structural integrity of pipeline in RHPP. Two approaches, one more sophisticated (micromechanical modelling), and the other, simpler one (FAD), lead to the same conclusion, that proof over-pressure is unnecessary challenge to the safety of the critical component in a very important power plant.
Keywords:
Pressure equipment / hydrostatic test / fracture mechanics / stress state / crack / finite element method / numerical simulationsSource:
Mašinski fakultet Univerziteta u Beogradu, 2018, 01-92Publisher:
- Mašinski fakultet Univerziteta u Beogradu
Funding / projects:
- Design and development of hardware and software for connecting personal computers and electronic units in vehicles (RS-MESTD-Technological Development (TD or TR)-35013)
- Development, design and implementation of modern strategies of integrated management of operations and vehicle and mechanization maintenance in auto transport, mining and energy (RS-MESTD-Technological Development (TD or TR)-35030)
- Development of the method for the production of MEP design and construction documents compatible with BIM process and related standards (RS-MESTD-Technological Development (TD or TR)-36038)
Note:
- dr Marko Jarić-naučni saradnik-članstvo u komisiji za izradu, ocenu i odbranu doktorske disertacije kandidata Igora I Martića. Članovi komisije za odbranu doktorske disertacije: dr Aleksandar Sedmak, redovni profesor (mentor), Univerzitet u Beogradu, Mašinski fakultet dr Marko Jarić, naučni saradnik, Inovacioni centar, Mašinski fakultet u Beogradu dr Nenad Mitrović, docent, Univerzitet u Beogradu Mašinski fakultet dr Marko Rakin, redovni profesor, Univerzitet u Beogradu, Tehnološko-metalurški fakultet dr Zoran Radaković, redovni profesor, Univerzitet u Beogradu, Mašinski fakultet Datum odbrane: 28.09.2018.
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Institution/Community
Inovacioni centarTY - THES AU - Martić, Igor PY - 2018 UR - https://machinery.mas.bg.ac.rs/handle/123456789/7207 AB - The applied stress level which will produce plastic deformations in WM is lower than the BM yield strength, not to mention effect of over-loading. One should also keep in mind that welded joints are places with non-uniform stress distribution because of stress concentration even if residual stresses are released. Therefore, simultaneously introduced different influencing factors will produce difficulties for stress calculation of welded joints, so that the design of pressure vessels becomes more complicated than usual. Sometimes, it is inevitable to test the produced pressure vessel, using different techniques, needed for stress calculations and assessment of weldments behaviour under different service conditions. Reversible HPP (RHPP) “Bajina Basta” is in operation since 1982, [2]. Taking into account that the failure of the most critical part, the pipeline (Fig. 1), would cause water overflow of the surge hub in the surrounding area, and the collapse of the entire plant, it is clear that special attention is still need to prove its structural integrity [3]. One of the most important effects is the proof testing, i.e. over-pressure, which is the main concern in this paper. Namely, there is a history of welded joint failures due to proof testing, e.g. spherical pressure vessels for liquefied natural gases (LNG) [4], caused by unnecessary plastic deformation acting as crack initiation and propagation mechanism. Some details are given below, as taken from monograph [3].. It is shown, using different approaches, that the effect of over-pressure is detrimental from the point of view of structural integrity of pipeline in RHPP. Two approaches, one more sophisticated (micromechanical modelling), and the other, simpler one (FAD), lead to the same conclusion, that proof over-pressure is unnecessary challenge to the safety of the critical component in a very important power plant. PB - Mašinski fakultet Univerziteta u Beogradu T2 - Mašinski fakultet Univerziteta u Beogradu T1 - Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom EP - 92 SP - 01 UR - https://hdl.handle.net/21.15107/rcub_machinery_7207 ER -
@phdthesis{ author = "Martić, Igor", year = "2018", abstract = "The applied stress level which will produce plastic deformations in WM is lower than the BM yield strength, not to mention effect of over-loading. One should also keep in mind that welded joints are places with non-uniform stress distribution because of stress concentration even if residual stresses are released. Therefore, simultaneously introduced different influencing factors will produce difficulties for stress calculation of welded joints, so that the design of pressure vessels becomes more complicated than usual. Sometimes, it is inevitable to test the produced pressure vessel, using different techniques, needed for stress calculations and assessment of weldments behaviour under different service conditions. Reversible HPP (RHPP) “Bajina Basta” is in operation since 1982, [2]. Taking into account that the failure of the most critical part, the pipeline (Fig. 1), would cause water overflow of the surge hub in the surrounding area, and the collapse of the entire plant, it is clear that special attention is still need to prove its structural integrity [3]. One of the most important effects is the proof testing, i.e. over-pressure, which is the main concern in this paper. Namely, there is a history of welded joint failures due to proof testing, e.g. spherical pressure vessels for liquefied natural gases (LNG) [4], caused by unnecessary plastic deformation acting as crack initiation and propagation mechanism. Some details are given below, as taken from monograph [3].. It is shown, using different approaches, that the effect of over-pressure is detrimental from the point of view of structural integrity of pipeline in RHPP. Two approaches, one more sophisticated (micromechanical modelling), and the other, simpler one (FAD), lead to the same conclusion, that proof over-pressure is unnecessary challenge to the safety of the critical component in a very important power plant.", publisher = "Mašinski fakultet Univerziteta u Beogradu", journal = "Mašinski fakultet Univerziteta u Beogradu", title = "Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom", pages = "92-01", url = "https://hdl.handle.net/21.15107/rcub_machinery_7207" }
Martić, I.. (2018). Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom. in Mašinski fakultet Univerziteta u Beogradu Mašinski fakultet Univerziteta u Beogradu., 01-92. https://hdl.handle.net/21.15107/rcub_machinery_7207
Martić I. Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom. in Mašinski fakultet Univerziteta u Beogradu. 2018;:01-92. https://hdl.handle.net/21.15107/rcub_machinery_7207 .
Martić, Igor, "Uticaj ispitivanja probnim pritiskom na nastanak i rast prslina u zavarenim spojevima opreme pod pritiskom" in Mašinski fakultet Univerziteta u Beogradu (2018):01-92, https://hdl.handle.net/21.15107/rcub_machinery_7207 .