Effect of coking in massive failure of tubes in an ethylene cracking furnace

Autores
Otegui, Luis Jose; de Bona, Jeremias; Fazzini, Pablo Gabriel
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The causes and characteristics of the massive failure of the radiant coil tubes in an ethylene cracking furnace, which failed during an emergency non-programmed stop, are investigated. The failed tubes had been in service for about three and a half years, while lifetime had been estimated in five years. Tensile testing showed severe in-service degradation of material mechanical properties. Longitudinal cracks on failed tubes are brittle and originate in the inner side of the tubes wall. All failed tubes display a thick layer of coke adhered to the inner wall. This coke comes easily broken by bending or tension stresses, but sustains compression. Theorigins of loads which lead to the fracture were replicated; cracks were lab-induced by longitudinal cutting and resulting openings measured. Mechanical modeling allowed concluding that loads that led to failures were due to differences between thermal expansion coefficients of tube alloy and the coke growth within them. When the furnace was cooled down, thermal contraction of tube metal was restricted by the thick coke layer. This layer grew in service in the pressure expanded tubes. Thefailures were due to a combination of circumferential loads induced by coke during fast cooling and low strength of tube material. Recommendations include monitoring coke thickness and comparing with critical thickness for tube rupture in case of an emergency stop. This way, operators will have a parameter useful to schedule decoke processes.
Fil: Otegui, Luis Jose. YPF - Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: de Bona, Jeremias. GIE Integrity of Assets; Argentina
Fil: Fazzini, Pablo Gabriel. GIE Integrity of Assets; Argentina
Materia
Coke Thickness
Emergency Stop
Ethylene Furnace
Tube Cracking
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/37203
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/37203
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effect of coking in massive failure of tubes in an ethylene cracking furnaceOtegui, Luis Josede Bona, JeremiasFazzini, Pablo GabrielCoke ThicknessEmergency StopEthylene FurnaceTube Crackinghttps://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2The causes and characteristics of the massive failure of the radiant coil tubes in an ethylene cracking furnace, which failed during an emergency non-programmed stop, are investigated. The failed tubes had been in service for about three and a half years, while lifetime had been estimated in five years. Tensile testing showed severe in-service degradation of material mechanical properties. Longitudinal cracks on failed tubes are brittle and originate in the inner side of the tubes wall. All failed tubes display a thick layer of coke adhered to the inner wall. This coke comes easily broken by bending or tension stresses, but sustains compression. Theorigins of loads which lead to the fracture were replicated; cracks were lab-induced by longitudinal cutting and resulting openings measured. Mechanical modeling allowed concluding that loads that led to failures were due to differences between thermal expansion coefficients of tube alloy and the coke growth within them. When the furnace was cooled down, thermal contraction of tube metal was restricted by the thick coke layer. This layer grew in service in the pressure expanded tubes. Thefailures were due to a combination of circumferential loads induced by coke during fast cooling and low strength of tube material. Recommendations include monitoring coke thickness and comparing with critical thickness for tube rupture in case of an emergency stop. This way, operators will have a parameter useful to schedule decoke processes.Fil: Otegui, Luis Jose. YPF - Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: de Bona, Jeremias. GIE Integrity of Assets; ArgentinaFil: Fazzini, Pablo Gabriel. GIE Integrity of Assets; ArgentinaPergamon-Elsevier Science Ltd.2015-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/37203Otegui, Luis Jose; de Bona, Jeremias; Fazzini, Pablo Gabriel; Effect of coking in massive failure of tubes in an ethylene cracking furnace; Pergamon-Elsevier Science Ltd.; Engineering Failure Analysis; 48; 2-2015; 201-2091350-6307CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.engfailanal.2014.11.004info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1350630714003380info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:18:02Zoai:ri.conicet.gov.ar:11336/37203instacron: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:34982025-09-29 10:18:03.224CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effect of coking in massive failure of tubes in an ethylene cracking furnace
title Effect of coking in massive failure of tubes in an ethylene cracking furnace
spellingShingle Effect of coking in massive failure of tubes in an ethylene cracking furnace
Otegui, Luis Jose
Coke Thickness
Emergency Stop
Ethylene Furnace
Tube Cracking
title_short Effect of coking in massive failure of tubes in an ethylene cracking furnace
title_full Effect of coking in massive failure of tubes in an ethylene cracking furnace
title_fullStr Effect of coking in massive failure of tubes in an ethylene cracking furnace
title_full_unstemmed Effect of coking in massive failure of tubes in an ethylene cracking furnace
title_sort Effect of coking in massive failure of tubes in an ethylene cracking furnace
dc.creator.none.fl_str_mv Otegui, Luis Jose
de Bona, Jeremias
Fazzini, Pablo Gabriel
author Otegui, Luis Jose
author_facet Otegui, Luis Jose
de Bona, Jeremias
Fazzini, Pablo Gabriel
author_role author
author2 de Bona, Jeremias
Fazzini, Pablo Gabriel
author2_role author
author
dc.subject.none.fl_str_mv Coke Thickness
Emergency Stop
Ethylene Furnace
Tube Cracking
topic Coke Thickness
Emergency Stop
Ethylene Furnace
Tube Cracking
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The causes and characteristics of the massive failure of the radiant coil tubes in an ethylene cracking furnace, which failed during an emergency non-programmed stop, are investigated. The failed tubes had been in service for about three and a half years, while lifetime had been estimated in five years. Tensile testing showed severe in-service degradation of material mechanical properties. Longitudinal cracks on failed tubes are brittle and originate in the inner side of the tubes wall. All failed tubes display a thick layer of coke adhered to the inner wall. This coke comes easily broken by bending or tension stresses, but sustains compression. Theorigins of loads which lead to the fracture were replicated; cracks were lab-induced by longitudinal cutting and resulting openings measured. Mechanical modeling allowed concluding that loads that led to failures were due to differences between thermal expansion coefficients of tube alloy and the coke growth within them. When the furnace was cooled down, thermal contraction of tube metal was restricted by the thick coke layer. This layer grew in service in the pressure expanded tubes. Thefailures were due to a combination of circumferential loads induced by coke during fast cooling and low strength of tube material. Recommendations include monitoring coke thickness and comparing with critical thickness for tube rupture in case of an emergency stop. This way, operators will have a parameter useful to schedule decoke processes.
Fil: Otegui, Luis Jose. YPF - Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: de Bona, Jeremias. GIE Integrity of Assets; Argentina
Fil: Fazzini, Pablo Gabriel. GIE Integrity of Assets; Argentina
description The causes and characteristics of the massive failure of the radiant coil tubes in an ethylene cracking furnace, which failed during an emergency non-programmed stop, are investigated. The failed tubes had been in service for about three and a half years, while lifetime had been estimated in five years. Tensile testing showed severe in-service degradation of material mechanical properties. Longitudinal cracks on failed tubes are brittle and originate in the inner side of the tubes wall. All failed tubes display a thick layer of coke adhered to the inner wall. This coke comes easily broken by bending or tension stresses, but sustains compression. Theorigins of loads which lead to the fracture were replicated; cracks were lab-induced by longitudinal cutting and resulting openings measured. Mechanical modeling allowed concluding that loads that led to failures were due to differences between thermal expansion coefficients of tube alloy and the coke growth within them. When the furnace was cooled down, thermal contraction of tube metal was restricted by the thick coke layer. This layer grew in service in the pressure expanded tubes. Thefailures were due to a combination of circumferential loads induced by coke during fast cooling and low strength of tube material. Recommendations include monitoring coke thickness and comparing with critical thickness for tube rupture in case of an emergency stop. This way, operators will have a parameter useful to schedule decoke processes.
publishDate 2015
dc.date.none.fl_str_mv 2015-02
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/11336/37203
Otegui, Luis Jose; de Bona, Jeremias; Fazzini, Pablo Gabriel; Effect of coking in massive failure of tubes in an ethylene cracking furnace; Pergamon-Elsevier Science Ltd.; Engineering Failure Analysis; 48; 2-2015; 201-209
1350-6307
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37203
identifier_str_mv Otegui, Luis Jose; de Bona, Jeremias; Fazzini, Pablo Gabriel; Effect of coking in massive failure of tubes in an ethylene cracking furnace; Pergamon-Elsevier Science Ltd.; Engineering Failure Analysis; 48; 2-2015; 201-209
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.2014.11.004
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1350630714003380
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/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
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score 13.069144

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