Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads

Autores
Otegui, Luis Jose; Fazzini, Pablo Gabriel; Marquez, Anibal Angel
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Present rules in fabrication codes are aimed to reduce the probability of fatigue cracks in flanges welded to pressure vessels subjected to cyclic pressure or vibrations. Yet, several leaks and ruptures have recently occurred at flanges in pressure vessels and pipes. A review of three cases is presented, which involved five failures; their common root causes are discussed, and the influences of manufacture and operation conditions on crack initiation and propagation mechanisms are highlighted. Some cracks initiate from the outer surface, but many cracks initiate in the outer half of the thickness of the reinforcement, from very difficult to avoid weld defects. Ultrasonic testing, with an adequate procedure, can be reliably used to detect these defects before they become leaks. Common aspects of these failures are crack initiation in weld metal and heat affected zone of welds, all related to an inadequate design of the reinforcement and poor execution of the welding procedure. Weld inadequacy is in one case a result of an increase in thickness as an attempt to increase safety; which also increased cyclic stresses due to excessive weight of the vessel. Fillet welded reinforcements induced rigidity inconsistencies within the flange joint, and concentrated deformations in the failed regions. In another case, preoperational hydrotest could have been detrimental.
Fil: Otegui, Luis Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Fazzini, Pablo Gabriel. GIE S.A.; Argentina
Fil: Marquez, Anibal Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Materia
In Service Failures
Fatigue Failures
Pressure Vessels
Flanges
Reinforcement Saddles
Weld Defects
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/66256
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loadsOtegui, Luis JoseFazzini, Pablo GabrielMarquez, Anibal AngelIn Service FailuresFatigue FailuresPressure VesselsFlangesReinforcement SaddlesWeld Defectshttps://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2Present rules in fabrication codes are aimed to reduce the probability of fatigue cracks in flanges welded to pressure vessels subjected to cyclic pressure or vibrations. Yet, several leaks and ruptures have recently occurred at flanges in pressure vessels and pipes. A review of three cases is presented, which involved five failures; their common root causes are discussed, and the influences of manufacture and operation conditions on crack initiation and propagation mechanisms are highlighted. Some cracks initiate from the outer surface, but many cracks initiate in the outer half of the thickness of the reinforcement, from very difficult to avoid weld defects. Ultrasonic testing, with an adequate procedure, can be reliably used to detect these defects before they become leaks. Common aspects of these failures are crack initiation in weld metal and heat affected zone of welds, all related to an inadequate design of the reinforcement and poor execution of the welding procedure. Weld inadequacy is in one case a result of an increase in thickness as an attempt to increase safety; which also increased cyclic stresses due to excessive weight of the vessel. Fillet welded reinforcements induced rigidity inconsistencies within the flange joint, and concentrated deformations in the failed regions. In another case, preoperational hydrotest could have been detrimental.Fil: Otegui, Luis Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Fazzini, Pablo Gabriel. GIE S.A.; ArgentinaFil: Marquez, Anibal Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaPergamon-Elsevier Science Ltd2008-09-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/66256Otegui, Luis Jose; Fazzini, Pablo Gabriel; Marquez, Anibal Angel; Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads; Pergamon-Elsevier Science Ltd; Engineering Failure Analysis; 16; 6; 17-9-2008; 1825-18361350-6307CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.engfailanal.2008.08.027info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1350630708001829info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:11:36Zoai:ri.conicet.gov.ar:11336/66256instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:11:37.177CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
title Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
spellingShingle Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
Otegui, Luis Jose
In Service Failures
Fatigue Failures
Pressure Vessels
Flanges
Reinforcement Saddles
Weld Defects
title_short Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
title_full Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
title_fullStr Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
title_full_unstemmed Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
title_sort Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads
dc.creator.none.fl_str_mv Otegui, Luis Jose
Fazzini, Pablo Gabriel
Marquez, Anibal Angel
author Otegui, Luis Jose
author_facet Otegui, Luis Jose
Fazzini, Pablo Gabriel
Marquez, Anibal Angel
author_role author
author2 Fazzini, Pablo Gabriel
Marquez, Anibal Angel
author2_role author
author
dc.subject.none.fl_str_mv In Service Failures
Fatigue Failures
Pressure Vessels
Flanges
Reinforcement Saddles
Weld Defects
topic In Service Failures
Fatigue Failures
Pressure Vessels
Flanges
Reinforcement Saddles
Weld Defects
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Present rules in fabrication codes are aimed to reduce the probability of fatigue cracks in flanges welded to pressure vessels subjected to cyclic pressure or vibrations. Yet, several leaks and ruptures have recently occurred at flanges in pressure vessels and pipes. A review of three cases is presented, which involved five failures; their common root causes are discussed, and the influences of manufacture and operation conditions on crack initiation and propagation mechanisms are highlighted. Some cracks initiate from the outer surface, but many cracks initiate in the outer half of the thickness of the reinforcement, from very difficult to avoid weld defects. Ultrasonic testing, with an adequate procedure, can be reliably used to detect these defects before they become leaks. Common aspects of these failures are crack initiation in weld metal and heat affected zone of welds, all related to an inadequate design of the reinforcement and poor execution of the welding procedure. Weld inadequacy is in one case a result of an increase in thickness as an attempt to increase safety; which also increased cyclic stresses due to excessive weight of the vessel. Fillet welded reinforcements induced rigidity inconsistencies within the flange joint, and concentrated deformations in the failed regions. In another case, preoperational hydrotest could have been detrimental.
Fil: Otegui, Luis Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Fazzini, Pablo Gabriel. GIE S.A.; Argentina
Fil: Marquez, Anibal Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
description Present rules in fabrication codes are aimed to reduce the probability of fatigue cracks in flanges welded to pressure vessels subjected to cyclic pressure or vibrations. Yet, several leaks and ruptures have recently occurred at flanges in pressure vessels and pipes. A review of three cases is presented, which involved five failures; their common root causes are discussed, and the influences of manufacture and operation conditions on crack initiation and propagation mechanisms are highlighted. Some cracks initiate from the outer surface, but many cracks initiate in the outer half of the thickness of the reinforcement, from very difficult to avoid weld defects. Ultrasonic testing, with an adequate procedure, can be reliably used to detect these defects before they become leaks. Common aspects of these failures are crack initiation in weld metal and heat affected zone of welds, all related to an inadequate design of the reinforcement and poor execution of the welding procedure. Weld inadequacy is in one case a result of an increase in thickness as an attempt to increase safety; which also increased cyclic stresses due to excessive weight of the vessel. Fillet welded reinforcements induced rigidity inconsistencies within the flange joint, and concentrated deformations in the failed regions. In another case, preoperational hydrotest could have been detrimental.
publishDate 2008
dc.date.none.fl_str_mv 2008-09-17
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/66256
Otegui, Luis Jose; Fazzini, Pablo Gabriel; Marquez, Anibal Angel; Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads; Pergamon-Elsevier Science Ltd; Engineering Failure Analysis; 16; 6; 17-9-2008; 1825-1836
1350-6307
CONICET Digital
CONICET
url http://hdl.handle.net/11336/66256
identifier_str_mv Otegui, Luis Jose; Fazzini, Pablo Gabriel; Marquez, Anibal Angel; Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads; Pergamon-Elsevier Science Ltd; Engineering Failure Analysis; 16; 6; 17-9-2008; 1825-1836
1350-6307
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.engfailanal.2008.08.027
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1350630708001829
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842270165306179584
score 13.13397

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