Integrity Assessment of the Welded Nozzle-Header Joint of the Steam Superheater.
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| Title: | Integrity Assessment of the Welded Nozzle-Header Joint of the Steam Superheater. |
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| Authors: | DUNĐER, Ivan1 idunder@unisb.hr, KONJATIĆ, Pejo1 pkonjatic@unisb.hr, KATNIĆ, Marko1 mkatinic@unisb.hr, GELO, Ivan1 igelo@unisb.hr |
| Source: | Technical Gazette / Tehnički Vjesnik. 2025, Vol. 32 Issue 4, p1324-1329. 6p. |
| Subjects: | Welded joints, Manufacturing defects, Structural failures, Safety, Finite element method, Structural reliability, Failure analysis, Superheaters |
| Abstract: | Manufacturing flaw in pressure vessels and pipelines, especially in welded joints, poses a major challenge to structural integrity and operational safety. This paper examines the effects of such flaws, focussing on a specific case study of inclusions observed at the root of welded head-nozzle joints in a steam superheater. Finite Element Analysis (FEA) is used to investigate how these flaws affect the load capacity of the pressure vessel. To simulate the behaviour of the welds under operating conditions, two scenarios are considered: one with a sharp elliptical crack between two welded nozzles and another with a full torus-shaped flaw along the entire circumference of the weld root. During the analysis, stress distributions, plastic limit loads, stress intensity factors, fracture toughness and structural integrity are assessed using the Failure Assessment Diagram (FAD) and the SINTAP method. The results show that although the presence of a sharp elliptical crack with the considered dimensions between the nozzles does not significantly affect the static strength of the structure, plastic collapse must be considered as a potential failure mechanism, especially for highly plastic materials. The FAD analysis shows that the structure can withstand the operating pressure without failing, but failure due to plastic collapse can occur at higher pressures. The study emphasises the importance of considering both fracture mechanics and the plastic failure criterion when assessing the integrity of welded components in pressure vessels. [ABSTRACT FROM AUTHOR] |
| Copyright of Technical Gazette / Tehnički Vjesnik is the property of Tehnicki Vjesnik and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 187824327 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Integrity Assessment of the Welded Nozzle-Header Joint of the Steam Superheater. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22DUNĐER%2C+Ivan%22">DUNĐER, Ivan</searchLink><relatesTo>1</relatesTo><i> idunder@unisb.hr</i><br /><searchLink fieldCode="AR" term="%22KONJATIĆ%2C+Pejo%22">KONJATIĆ, Pejo</searchLink><relatesTo>1</relatesTo><i> pkonjatic@unisb.hr</i><br /><searchLink fieldCode="AR" term="%22KATNIĆ%2C+Marko%22">KATNIĆ, Marko</searchLink><relatesTo>1</relatesTo><i> mkatinic@unisb.hr</i><br /><searchLink fieldCode="AR" term="%22GELO%2C+Ivan%22">GELO, Ivan</searchLink><relatesTo>1</relatesTo><i> igelo@unisb.hr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Technical+Gazette+%2F+Tehnički+Vjesnik%22">Technical Gazette / Tehnički Vjesnik</searchLink>. 2025, Vol. 32 Issue 4, p1324-1329. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Welded+joints%22">Welded joints</searchLink><br /><searchLink fieldCode="DE" term="%22Manufacturing+defects%22">Manufacturing defects</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+failures%22">Structural failures</searchLink><br /><searchLink fieldCode="DE" term="%22Safety%22">Safety</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+reliability%22">Structural reliability</searchLink><br /><searchLink fieldCode="DE" term="%22Failure+analysis%22">Failure analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Superheaters%22">Superheaters</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Manufacturing flaw in pressure vessels and pipelines, especially in welded joints, poses a major challenge to structural integrity and operational safety. This paper examines the effects of such flaws, focussing on a specific case study of inclusions observed at the root of welded head-nozzle joints in a steam superheater. Finite Element Analysis (FEA) is used to investigate how these flaws affect the load capacity of the pressure vessel. To simulate the behaviour of the welds under operating conditions, two scenarios are considered: one with a sharp elliptical crack between two welded nozzles and another with a full torus-shaped flaw along the entire circumference of the weld root. During the analysis, stress distributions, plastic limit loads, stress intensity factors, fracture toughness and structural integrity are assessed using the Failure Assessment Diagram (FAD) and the SINTAP method. The results show that although the presence of a sharp elliptical crack with the considered dimensions between the nozzles does not significantly affect the static strength of the structure, plastic collapse must be considered as a potential failure mechanism, especially for highly plastic materials. The FAD analysis shows that the structure can withstand the operating pressure without failing, but failure due to plastic collapse can occur at higher pressures. The study emphasises the importance of considering both fracture mechanics and the plastic failure criterion when assessing the integrity of welded components in pressure vessels. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Technical Gazette / Tehnički Vjesnik is the property of Tehnicki Vjesnik and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.17559/TV-20240521001636 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1324 Subjects: – SubjectFull: Welded joints Type: general – SubjectFull: Manufacturing defects Type: general – SubjectFull: Structural failures Type: general – SubjectFull: Safety Type: general – SubjectFull: Finite element method Type: general – SubjectFull: Structural reliability Type: general – SubjectFull: Failure analysis Type: general – SubjectFull: Superheaters Type: general Titles: – TitleFull: Integrity Assessment of the Welded Nozzle-Header Joint of the Steam Superheater. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: DUNĐER, Ivan – PersonEntity: Name: NameFull: KONJATIĆ, Pejo – PersonEntity: Name: NameFull: KATNIĆ, Marko – PersonEntity: Name: NameFull: GELO, Ivan IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 13303651 Numbering: – Type: volume Value: 32 – Type: issue Value: 4 Titles: – TitleFull: Technical Gazette / Tehnički Vjesnik Type: main |
| ResultId | 1 |
