TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, D.
AU  - Lazić, V.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4560
AB  - Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.
T2  - International Journal of Pressure Vessels and Piping
T1  - Remaining strength of API J55 steel casing pipes damaged by corrosion
VL  - 188
DO  - 10.1016/j.ijpvp.2020.104230
ER  - 

@article{
author = "Sedmak, Aleksandar and Arsić, Miodrag and Šarkočević, Živče and Međo, Bojan and Rakin, Marko and Arsić, D. and Lazić, V.",
year = "2020",
abstract = "Experimental investigation of the integrity of casing pipes, used in the oil drilling rigs, withdrawn after about 70,000 h of service, has been conducted, together with numerical simulation. Pipes were manufactured by the high frequency contact welding (HF) of API J55 steel. The influence of corrosion damage is investigated by means of pressure test of a pipe with different damage levels made by machining the circular holes. The finite element analysis of the damaged pipe subjected to internal pressure is conducted to simulate the stress state in the pipe and to establish the criteria for the maximum pressure that a damaged pipe can withstand. Several analytical expressions were used to estimate the maximum pressure in a damaged pipeline, and the solutions were compared to predictions of finite element models and experimental results.",
journal = "International Journal of Pressure Vessels and Piping",
title = "Remaining strength of API J55 steel casing pipes damaged by corrosion",
volume = "188",
doi = "10.1016/j.ijpvp.2020.104230"
}

Sedmak, A., Arsić, M., Šarkočević, Ž., Međo, B., Rakin, M., Arsić, D.,& Lazić, V.. (2020). Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping, 188.
https://doi.org/10.1016/j.ijpvp.2020.104230

Sedmak A, Arsić M, Šarkočević Ž, Međo B, Rakin M, Arsić D, Lazić V. Remaining strength of API J55 steel casing pipes damaged by corrosion. in International Journal of Pressure Vessels and Piping. 2020;188.
doi:10.1016/j.ijpvp.2020.104230 .

Sedmak, Aleksandar, Arsić, Miodrag, Šarkočević, Živče, Međo, Bojan, Rakin, Marko, Arsić, D., Lazić, V., "Remaining strength of API J55 steel casing pipes damaged by corrosion" in International Journal of Pressure Vessels and Piping, 188 (2020),
https://doi.org/10.1016/j.ijpvp.2020.104230 . .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Matvienko, Y.
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3057
AB  - Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are also often exposed to damages at the external surface. A pipe segment exposed to internal pressure is examined experimentally and numerically, using the finite element method. Experimental setup included tracking of crack mouth opening displacement (CMOD) values, as well as J integral. Criteria for pipe failure are determined on the finite element (FE) models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. Several 3D models with different crack sizes are evaluated. 2D plane strain models are also examined, to determine the applicability limits of this simplified approach. Integrity assessment criteria for the analysed geometries are discussed. Assessment of fracture resistance of the pipeline material is also considered in this work. Besides the standard SENB specimens, Ring specimens cut from the pipe are tested, and the results are compared. Both specimen geometries are modelled using local approach to fracture, by application of the micromechanical Complete Gurson model (CGM), developed by Z.L. Zhang. It is shown that the Ring specimens have similar fracture conditions under bending load as SENB specimens. Since they are much simpler to fabricate from the pipe than standard specimens, it is concluded that they can be used for assessment of fracture of the pipes with axial cracks.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Failure resistance of drilling rig casing pipes with an axial crack
EP  - 440
SP  - 429
VL  - 58
DO  - 10.1016/j.engfailanal.2015.05.015
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Gubeljak, Nenad and Matvienko, Y. and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2015",
abstract = "Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are also often exposed to damages at the external surface. A pipe segment exposed to internal pressure is examined experimentally and numerically, using the finite element method. Experimental setup included tracking of crack mouth opening displacement (CMOD) values, as well as J integral. Criteria for pipe failure are determined on the finite element (FE) models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. Several 3D models with different crack sizes are evaluated. 2D plane strain models are also examined, to determine the applicability limits of this simplified approach. Integrity assessment criteria for the analysed geometries are discussed. Assessment of fracture resistance of the pipeline material is also considered in this work. Besides the standard SENB specimens, Ring specimens cut from the pipe are tested, and the results are compared. Both specimen geometries are modelled using local approach to fracture, by application of the micromechanical Complete Gurson model (CGM), developed by Z.L. Zhang. It is shown that the Ring specimens have similar fracture conditions under bending load as SENB specimens. Since they are much simpler to fabricate from the pipe than standard specimens, it is concluded that they can be used for assessment of fracture of the pipes with axial cracks.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Failure resistance of drilling rig casing pipes with an axial crack",
pages = "440-429",
volume = "58",
doi = "10.1016/j.engfailanal.2015.05.015"
}

Međo, B., Rakin, M., Gubeljak, N., Matvienko, Y., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2015). Failure resistance of drilling rig casing pipes with an axial crack. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 58, 429-440.
https://doi.org/10.1016/j.engfailanal.2015.05.015

Međo B, Rakin M, Gubeljak N, Matvienko Y, Arsić M, Šarkočević Ž, Sedmak A. Failure resistance of drilling rig casing pipes with an axial crack. in Engineering Failure Analysis. 2015;58:429-440.
doi:10.1016/j.engfailanal.2015.05.015 .

Međo, Bojan, Rakin, Marko, Gubeljak, Nenad, Matvienko, Y., Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Failure resistance of drilling rig casing pipes with an axial crack" in Engineering Failure Analysis, 58 (2015):429-440,
https://doi.org/10.1016/j.engfailanal.2015.05.015 . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2803
AB  - Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a steel pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are often exposed to damages at the external surface. Analyzed crack is in axial direction, bearing in mind that this type of defect most significantly decreases the load carrying capacity of the cylindrical pressurized components. A pipe segment exposed to internal pressure is analyzed experimentally and numerically, using the finite element method. The experimental setup included the tracking of crack mouth opening displacement (CMOD) values, as well as J integral, which is determined by application of direct measurement. Criteria for pipe failure are determined on finite element models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. The size of the crack is varied in the finite element models; several 3D models with different crack sizes (length and depth) are evaluated. Dependence of maximum internal pressure on the defect size is obtained. 2D plane strain models are also examined, with an aim to determine the applicability limits of this simplified approach. Based on the obtained results, integrity assessment criteria for the analyzed geometries are discussed.
PB  - Elsevier Science Bv, Amsterdam
T2  - 20th European Conference on Fracture
T1  - Failure prediction of gas and oil drilling rig pipelines with axial defects
EP  - 960
SP  - 955
VL  - 3
DO  - 10.1016/j.mspro.2014.06.155
ER  - 

@article{
author = "Dimić, Ivana and Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2014",
abstract = "Working conditions of casing pipes in drilling rigs can significantly influence the initiation and development of damage in the material, and therefore also the safe service of the entire system. In this work, an integrity assessment of a steel pipe with initial defect (machined surface crack) is presented. The position of this defect is on the external surface; unlike transport pipes, where internal surface is often endangered due to the contact with the fluid, casing pipes are often exposed to damages at the external surface. Analyzed crack is in axial direction, bearing in mind that this type of defect most significantly decreases the load carrying capacity of the cylindrical pressurized components. A pipe segment exposed to internal pressure is analyzed experimentally and numerically, using the finite element method. The experimental setup included the tracking of crack mouth opening displacement (CMOD) values, as well as J integral, which is determined by application of direct measurement. Criteria for pipe failure are determined on finite element models of the pipe; fracture initiation and plastic collapse are considered as failure mechanisms. The size of the crack is varied in the finite element models; several 3D models with different crack sizes (length and depth) are evaluated. Dependence of maximum internal pressure on the defect size is obtained. 2D plane strain models are also examined, with an aim to determine the applicability limits of this simplified approach. Based on the obtained results, integrity assessment criteria for the analyzed geometries are discussed.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "20th European Conference on Fracture",
title = "Failure prediction of gas and oil drilling rig pipelines with axial defects",
pages = "960-955",
volume = "3",
doi = "10.1016/j.mspro.2014.06.155"
}

Dimić, I., Međo, B., Rakin, M., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2014). Failure prediction of gas and oil drilling rig pipelines with axial defects. in 20th European Conference on Fracture
Elsevier Science Bv, Amsterdam., 3, 955-960.
https://doi.org/10.1016/j.mspro.2014.06.155

Dimić I, Međo B, Rakin M, Arsić M, Šarkočević Ž, Sedmak A. Failure prediction of gas and oil drilling rig pipelines with axial defects. in 20th European Conference on Fracture. 2014;3:955-960.
doi:10.1016/j.mspro.2014.06.155 .

Dimić, Ivana, Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Failure prediction of gas and oil drilling rig pipelines with axial defects" in 20th European Conference on Fracture, 3 (2014):955-960,
https://doi.org/10.1016/j.mspro.2014.06.155 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2740
AB  - The subject of this work is examination of API J55 steel casing pipes manufactured by high frequency (HF) contact welding. Since the pipes were withdrawn after about 70 000 hours of service in an oil drilling rig, the influence of the exploitation conditions on the material properties is determined. Experimental analysis includes tensile, impact toughness and fatigue testing of the specimens cut from the exploited pipe and the new pipe manufactured from the same-grade material. Additionally, pipe with flaws (stress concentrators) is tested by subjecting to internal pressure. The analysed stress concentrators represent defects which are often found in the exploitation: localized corrosion damages (corrosion pits). They were simulated by machining on the external surface of the pipe wall. The behavior of the pipes with these defects is determined by strain measurement and finite element analysis in software package Abaqus. The dimensions of the defects are varied, in order to determine the dependence of load carrying capacity on their depth and length. Several expressions from the literature are applied for estimation of the maximum pressure in damaged pipelines, and the solutions are compared with the predictions of finite element models. Additionally, triaxiality values at the bottom of the defects are compared with those obtained on tensile specimens, having in mind the key role of this parameter in ductile fracture initiation.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing
T1  - Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs
EP  - +
SP  - 65
VL  - 601
DO  - 10.4028/www.scientific.net/KEM.601.65
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar",
year = "2014",
abstract = "The subject of this work is examination of API J55 steel casing pipes manufactured by high frequency (HF) contact welding. Since the pipes were withdrawn after about 70 000 hours of service in an oil drilling rig, the influence of the exploitation conditions on the material properties is determined. Experimental analysis includes tensile, impact toughness and fatigue testing of the specimens cut from the exploited pipe and the new pipe manufactured from the same-grade material. Additionally, pipe with flaws (stress concentrators) is tested by subjecting to internal pressure. The analysed stress concentrators represent defects which are often found in the exploitation: localized corrosion damages (corrosion pits). They were simulated by machining on the external surface of the pipe wall. The behavior of the pipes with these defects is determined by strain measurement and finite element analysis in software package Abaqus. The dimensions of the defects are varied, in order to determine the dependence of load carrying capacity on their depth and length. Several expressions from the literature are applied for estimation of the maximum pressure in damaged pipelines, and the solutions are compared with the predictions of finite element models. Additionally, triaxiality values at the bottom of the defects are compared with those obtained on tensile specimens, having in mind the key role of this parameter in ductile fracture initiation.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing",
title = "Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs",
pages = "+-65",
volume = "601",
doi = "10.4028/www.scientific.net/KEM.601.65"
}

Rakin, M., Međo, B., Arsić, M., Šarkočević, Ž.,& Sedmak, A.. (2014). Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs. in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing
Trans Tech Publications Ltd, Durnten-Zurich., 601, 65-+.
https://doi.org/10.4028/www.scientific.net/KEM.601.65

Rakin M, Međo B, Arsić M, Šarkočević Ž, Sedmak A. Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs. in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing. 2014;601:65-+.
doi:10.4028/www.scientific.net/KEM.601.65 .

Rakin, Marko, Međo, Bojan, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, "Effect of Exploitation Conditions and Flaw Geometry on the Load Carrying Capacity of Casing Pipes for Oil Drilling Rigs" in Proceedings of the 14th Symposium on Experimental Stress Analysis and Materials Testing, 601 (2014):65-+,
https://doi.org/10.4028/www.scientific.net/KEM.601.65 . .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
AU  - Mišić, Milan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2599
AB  - The subject of the paper is analysis of the integrity of welded pipes made of API J55 steel by high frequency contact welding (HF). Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service. Defect influence of the surface crack on the integrity of pipes was tested using hydrostatic pressure of pipes with axial surface crack in the base material. Fracture behaviour was tested using modified compact specimen (CT), with the initial crack in the base material, welded joint and heat affected zone (HAZ). Critical value of the tensile strength factors KIc was determined based on the critical value J of the integral JIc. Apart from the experimental research, based on the derived values of Kr and Sr and by applying fracture analysis diagram (FAD) an assessment of the integrity of welded pipes with axial surface crack on the outer surface area was conducted.
AB  - Predmet rada je analiza integriteta zavarenih cevi izrađenih od čelika API J55 visokofrekventnim kontaktnim zavarivanjem (VF). Eksperimentalna ispitivanja mehaničkih osobina osnovnog materijala su izvršena na cevima povučenim iz ekspolatacije posle 70 000 sati rada. Uticaj oštećenja tipa površinske prsline na integritet cevi ispitan je hidrostatičkim pritiskom cevi sa aksijalnom površinskom prslinom u osnovnom materijalu. Ponašanje pri lomu je ispitivano korištenjem modifikovanih kompaktnih epruveta za zatezanje (CT), s početnom prslinom u osnovnom materijalu, zavarenom spoju i zoni uticaja toplote (ZUT). Kritična vrednost faktora intenziteta napona KIc određena je na osnovu kritične vrednosti J integrala JIc. Osim eksperimentalnog istraživanja, na osnovu dobijenih vrednosti za Kr i Sr primenom dijagrama analize loma (FAD) izvršena je procena integriteta zavarenih cevi sa aksijalnom površinskom prslinom na spoljašnjoj površini.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Assessment of the integrity of welded pipes
T1  - Procena integriteta zavarenih cevi
EP  - 292
IS  - 3
SP  - 287
VL  - 55
DO  - 10.5937/ZasMat1403287S
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Sedmak, Aleksandar and Međo, Bojan and Mišić, Milan",
year = "2014",
abstract = "The subject of the paper is analysis of the integrity of welded pipes made of API J55 steel by high frequency contact welding (HF). Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service. Defect influence of the surface crack on the integrity of pipes was tested using hydrostatic pressure of pipes with axial surface crack in the base material. Fracture behaviour was tested using modified compact specimen (CT), with the initial crack in the base material, welded joint and heat affected zone (HAZ). Critical value of the tensile strength factors KIc was determined based on the critical value J of the integral JIc. Apart from the experimental research, based on the derived values of Kr and Sr and by applying fracture analysis diagram (FAD) an assessment of the integrity of welded pipes with axial surface crack on the outer surface area was conducted., Predmet rada je analiza integriteta zavarenih cevi izrađenih od čelika API J55 visokofrekventnim kontaktnim zavarivanjem (VF). Eksperimentalna ispitivanja mehaničkih osobina osnovnog materijala su izvršena na cevima povučenim iz ekspolatacije posle 70 000 sati rada. Uticaj oštećenja tipa površinske prsline na integritet cevi ispitan je hidrostatičkim pritiskom cevi sa aksijalnom površinskom prslinom u osnovnom materijalu. Ponašanje pri lomu je ispitivano korištenjem modifikovanih kompaktnih epruveta za zatezanje (CT), s početnom prslinom u osnovnom materijalu, zavarenom spoju i zoni uticaja toplote (ZUT). Kritična vrednost faktora intenziteta napona KIc određena je na osnovu kritične vrednosti J integrala JIc. Osim eksperimentalnog istraživanja, na osnovu dobijenih vrednosti za Kr i Sr primenom dijagrama analize loma (FAD) izvršena je procena integriteta zavarenih cevi sa aksijalnom površinskom prslinom na spoljašnjoj površini.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Assessment of the integrity of welded pipes, Procena integriteta zavarenih cevi",
pages = "292-287",
number = "3",
volume = "55",
doi = "10.5937/ZasMat1403287S"
}

Šarkočević, Ž., Arsić, M., Sedmak, A., Međo, B.,& Mišić, M.. (2014). Assessment of the integrity of welded pipes. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 55(3), 287-292.
https://doi.org/10.5937/ZasMat1403287S

Šarkočević Ž, Arsić M, Sedmak A, Međo B, Mišić M. Assessment of the integrity of welded pipes. in Zaštita materijala. 2014;55(3):287-292.
doi:10.5937/ZasMat1403287S .

Šarkočević, Živče, Arsić, Miodrag, Sedmak, Aleksandar, Međo, Bojan, Mišić, Milan, "Assessment of the integrity of welded pipes" in Zaštita materijala, 55, no. 3 (2014):287-292,
https://doi.org/10.5937/ZasMat1403287S . .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mišić, Milan
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2302
AB  - Steel pipes in oil and gas wells are continuously exposed to the process of corrosion-assisted elevated temperatures and pressures prevailing in the interior of the tube. Corrosion can lead to significant reduction of mechanical properties of steels and welded joints which may under unfavorable conditions, lead to breaking of pipes even faster if the stresses are higher. Failures of welded pipes in oil and gas wells, caused by errors in the preparation of tubes and / or their damage in service, in addition to the impact on the reliability and safety in the work and have environmental impacts on the environment and the quality of land, water and air. Protection of welded pipes in oil wells belong to the highly responsible structures that are susceptible to corrosion. It is therefore important to know the remaining strength of pipe in the event of corrosion damage. This paper presents the results of testing of damage API J55 steel, used for the production of protective high-frequency pipe welding contact (VF). Investigated tube was withdrawn from service after about 70 000 operating hours (8 years) in the oil rig. Experiments were performed on the protective welded pipes from service by the closed tori spherical head, the mechanical treatment simulated by the corrosive damage to the outer surface of the tube. For determining the resistance of welded pipes to damage were measured and calculated deformations are the main normal stresses. The application of the ASME B31G, modified ASME B31G, calculate the maximum pressures of damaged pipes.
AB  - Čelične cevi u naftnim i gasnim bušotinama su kontinuirano izložene procesu korozije potpomognutom povišenim temperaturama i pritiscima, koji vladaju u unutrašnjosti cevi. Korozija može da dovede do značajnog smanjenja mehaničkih osobina čelika i zavarenog spoja što može pod nepovoljnim uslovima predstavljati uvod u lom cevi i to brže ukoliko su naprezanja veća. Otkazi zavarenih cevi u naftnim i gasnim bušotinama, nastali usled grešaka u izradi cevi i/ili njihovog oštećenja u eksploataciji, pored uticaja na pouzdanost i bezbednost u radu imaju i ekološki uticaj na okolinu, odnosno na kvalitet zemlje, vode i vazduha. Zaštitne zavarene cevi u naftnim bušotinama spadaju u visoko odgovorne konstrukcije koje su osetljive na koroziju. Zato je bitno poznavati preostalu čvrstoću cevi u slučaju pojave korozionog oštećenja. U radu su prikazani rezultati ispitivanja nivoa oštećenja čelika APIJ55, korišćenog za izradu zaštitnih cevi visokofrekventnim kontaktnim postupkom zavarivanja (VF). Ispitivana cev je povučena iz eksploatacije nakon približno 70 000 radnih sati (8 godina) u naftnoj bušotini. Eksperimentalna ispitivanja su izvršena na zaštitnim zavarenim cevima iz eksploatacije koje su zatvorene torisferičnim dancima, sa mehaničkom obradom simuluranim korozionim oštećenjima na spoljašnjoj površini cevi. Za određivanja otpornosti zaštitnih zavarenih cevi prema oštećenju izvršeno je merenje deformacija i izračunati su glavni normalni naponi. Primenom postupka ASME B31G, modifikovanog ASME B31G, izračunati su maksimalni pritisci oštećenih cevi.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Corrosion resistance of welded pipe in oil wells
T1  - Otpornost na koroziju zavarenih cevi u naftnim bušotinama
EP  - 63
IS  - 1
SP  - 57
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2302
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Rakin, Marko and Međo, Bojan and Mišić, Milan",
year = "2013",
abstract = "Steel pipes in oil and gas wells are continuously exposed to the process of corrosion-assisted elevated temperatures and pressures prevailing in the interior of the tube. Corrosion can lead to significant reduction of mechanical properties of steels and welded joints which may under unfavorable conditions, lead to breaking of pipes even faster if the stresses are higher. Failures of welded pipes in oil and gas wells, caused by errors in the preparation of tubes and / or their damage in service, in addition to the impact on the reliability and safety in the work and have environmental impacts on the environment and the quality of land, water and air. Protection of welded pipes in oil wells belong to the highly responsible structures that are susceptible to corrosion. It is therefore important to know the remaining strength of pipe in the event of corrosion damage. This paper presents the results of testing of damage API J55 steel, used for the production of protective high-frequency pipe welding contact (VF). Investigated tube was withdrawn from service after about 70 000 operating hours (8 years) in the oil rig. Experiments were performed on the protective welded pipes from service by the closed tori spherical head, the mechanical treatment simulated by the corrosive damage to the outer surface of the tube. For determining the resistance of welded pipes to damage were measured and calculated deformations are the main normal stresses. The application of the ASME B31G, modified ASME B31G, calculate the maximum pressures of damaged pipes., Čelične cevi u naftnim i gasnim bušotinama su kontinuirano izložene procesu korozije potpomognutom povišenim temperaturama i pritiscima, koji vladaju u unutrašnjosti cevi. Korozija može da dovede do značajnog smanjenja mehaničkih osobina čelika i zavarenog spoja što može pod nepovoljnim uslovima predstavljati uvod u lom cevi i to brže ukoliko su naprezanja veća. Otkazi zavarenih cevi u naftnim i gasnim bušotinama, nastali usled grešaka u izradi cevi i/ili njihovog oštećenja u eksploataciji, pored uticaja na pouzdanost i bezbednost u radu imaju i ekološki uticaj na okolinu, odnosno na kvalitet zemlje, vode i vazduha. Zaštitne zavarene cevi u naftnim bušotinama spadaju u visoko odgovorne konstrukcije koje su osetljive na koroziju. Zato je bitno poznavati preostalu čvrstoću cevi u slučaju pojave korozionog oštećenja. U radu su prikazani rezultati ispitivanja nivoa oštećenja čelika APIJ55, korišćenog za izradu zaštitnih cevi visokofrekventnim kontaktnim postupkom zavarivanja (VF). Ispitivana cev je povučena iz eksploatacije nakon približno 70 000 radnih sati (8 godina) u naftnoj bušotini. Eksperimentalna ispitivanja su izvršena na zaštitnim zavarenim cevima iz eksploatacije koje su zatvorene torisferičnim dancima, sa mehaničkom obradom simuluranim korozionim oštećenjima na spoljašnjoj površini cevi. Za određivanja otpornosti zaštitnih zavarenih cevi prema oštećenju izvršeno je merenje deformacija i izračunati su glavni normalni naponi. Primenom postupka ASME B31G, modifikovanog ASME B31G, izračunati su maksimalni pritisci oštećenih cevi.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Corrosion resistance of welded pipe in oil wells, Otpornost na koroziju zavarenih cevi u naftnim bušotinama",
pages = "63-57",
number = "1",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2302"
}

Šarkočević, Ž., Arsić, M., Rakin, M., Međo, B.,& Mišić, M.. (2013). Corrosion resistance of welded pipe in oil wells. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 54(1), 57-63.
https://hdl.handle.net/21.15107/rcub_technorep_2302

Šarkočević Ž, Arsić M, Rakin M, Međo B, Mišić M. Corrosion resistance of welded pipe in oil wells. in Zaštita materijala. 2013;54(1):57-63.
https://hdl.handle.net/21.15107/rcub_technorep_2302 .

Šarkočević, Živče, Arsić, Miodrag, Rakin, Marko, Međo, Bojan, Mišić, Milan, "Corrosion resistance of welded pipe in oil wells" in Zaštita materijala, 54, no. 1 (2013):57-63,
https://hdl.handle.net/21.15107/rcub_technorep_2302 .

TY  - JOUR
AU  - Lazić-Vulicević, Ljubica
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2465
AB  - Structural life of welded pipes made of API J55 steel by high-frequency (HF) welding has been evaluated. Experimental tests of base metal mechanical properties, including fatigue properties, were conducted on pipes after 70.000 hours of service in an oil drilling rig. The fatigue crack growth rate and fatigue threshold is obtained using the pre-cracked Charpy specimens. The number of cycles to the final fracture is then calculated using initial and critical crack depths. Based on the number of cycles to the final fracture and the remaining fatigue lifetime of pipes with axial outer surface crack are determined. It was shown that the remaining fatigue lifetime is more sensitive to the changes in the stress range than to the initial crack depth.
PB  - University of Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki vjesnik-Technical Gazette
T1  - Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding
EP  - 1094
IS  - 6
SP  - 1091
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2465
ER  - 

@article{
author = "Lazić-Vulicević, Ljubica and Arsić, Miodrag and Šarkočević, Živče and Sedmak, Aleksandar and Rakin, Marko",
year = "2013",
abstract = "Structural life of welded pipes made of API J55 steel by high-frequency (HF) welding has been evaluated. Experimental tests of base metal mechanical properties, including fatigue properties, were conducted on pipes after 70.000 hours of service in an oil drilling rig. The fatigue crack growth rate and fatigue threshold is obtained using the pre-cracked Charpy specimens. The number of cycles to the final fracture is then calculated using initial and critical crack depths. Based on the number of cycles to the final fracture and the remaining fatigue lifetime of pipes with axial outer surface crack are determined. It was shown that the remaining fatigue lifetime is more sensitive to the changes in the stress range than to the initial crack depth.",
publisher = "University of Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki vjesnik-Technical Gazette",
title = "Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding",
pages = "1094-1091",
number = "6",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2465"
}

Lazić-Vulicević, L., Arsić, M., Šarkočević, Ž., Sedmak, A.,& Rakin, M.. (2013). Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding. in Tehnicki vjesnik-Technical Gazette
University of Osijek, Tech Fac, Slavonski Brod., 20(6), 1091-1094.
https://hdl.handle.net/21.15107/rcub_technorep_2465

Lazić-Vulicević L, Arsić M, Šarkočević Ž, Sedmak A, Rakin M. Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding. in Tehnicki vjesnik-Technical Gazette. 2013;20(6):1091-1094.
https://hdl.handle.net/21.15107/rcub_technorep_2465 .

Lazić-Vulicević, Ljubica, Arsić, Miodrag, Šarkočević, Živče, Sedmak, Aleksandar, Rakin, Marko, "Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding" in Tehnicki vjesnik-Technical Gazette, 20, no. 6 (2013):1091-1094,
https://hdl.handle.net/21.15107/rcub_technorep_2465 .

TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Zrilić, Milorad
AU  - Putić, Slaviša
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2191
AB  - The subject of this study was the application of local approach to ductile fracture in order to estimate the integrity of damaged seam casing pipes for oil and gas drilling rigs. The experimental testing included tensile testing of specimens and a pressure test of a pipe with different levels of damage simulated by machined notches. In exploitation, such structures (i.e., pipes with local thin areas) can fail by the ductile fracture mechanism or by plastic collapse in the ligament. However, the majority of the procedures for determining their integrity are based on limit loads, i.e., plastic collapse criteria. In this work, a pipe subjected to internal pressure was modelled using the finite element method and local approach to fracture (the Complete Gurson Model - CGM), with the aim of determining damage development in the material (i.e., at the bottom of a machined defect) and of establishing the criteria for the maximum pressure that a damaged pipe can withstand. The results obtained using the micromechanical model are discussed and compared with several often used limit load expressions from the literature and a stress-based finite element criterion. It is shown that local approach can give appropriate results and represent failure criterion for pipes with local thin areas. [doi:10.2320/matertrans.M2011210]
PB  - Japan Inst Metals, Sendai
T2  - Materials Transactions
T1  - Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture
EP  - 190
IS  - 1
SP  - 185
VL  - 53
DO  - 10.2320/matertrans.M2011210
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Šarkočević, Živče and Zrilić, Milorad and Putić, Slaviša",
year = "2012",
abstract = "The subject of this study was the application of local approach to ductile fracture in order to estimate the integrity of damaged seam casing pipes for oil and gas drilling rigs. The experimental testing included tensile testing of specimens and a pressure test of a pipe with different levels of damage simulated by machined notches. In exploitation, such structures (i.e., pipes with local thin areas) can fail by the ductile fracture mechanism or by plastic collapse in the ligament. However, the majority of the procedures for determining their integrity are based on limit loads, i.e., plastic collapse criteria. In this work, a pipe subjected to internal pressure was modelled using the finite element method and local approach to fracture (the Complete Gurson Model - CGM), with the aim of determining damage development in the material (i.e., at the bottom of a machined defect) and of establishing the criteria for the maximum pressure that a damaged pipe can withstand. The results obtained using the micromechanical model are discussed and compared with several often used limit load expressions from the literature and a stress-based finite element criterion. It is shown that local approach can give appropriate results and represent failure criterion for pipes with local thin areas. [doi:10.2320/matertrans.M2011210]",
publisher = "Japan Inst Metals, Sendai",
journal = "Materials Transactions",
title = "Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture",
pages = "190-185",
number = "1",
volume = "53",
doi = "10.2320/matertrans.M2011210"
}

Međo, B., Rakin, M., Arsić, M., Šarkočević, Ž., Zrilić, M.,& Putić, S.. (2012). Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture. in Materials Transactions
Japan Inst Metals, Sendai., 53(1), 185-190.
https://doi.org/10.2320/matertrans.M2011210

Međo B, Rakin M, Arsić M, Šarkočević Ž, Zrilić M, Putić S. Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture. in Materials Transactions. 2012;53(1):185-190.
doi:10.2320/matertrans.M2011210 .

Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Šarkočević, Živče, Zrilić, Milorad, Putić, Slaviša, "Determination of the Load Carrying Capacity of Damaged Pipes Using Local Approach to Fracture" in Materials Transactions, 53, no. 1 (2012):185-190,
https://doi.org/10.2320/matertrans.M2011210 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Ivanović, I.
AU  - Sedmak, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2216
AB  - Seam casing pipe used in an oil drilling rig, manufactured by high frequency (HF) contact welding of API J55 steel, is tested. The influence of an initial defect (machined surface crack) is analysed, by performing pressure test of a pipe segment closed at both ends. Besides the damages at the internal surface, casing pipes are exposed to damage at the external surface, which is why such configuration is analysed here. Measurement of strains and crack mouth opening displacement (CMOD) enabled the application of direct method for J integral evaluation. This procedure is based on the path independence of the J integral and can be applied both in laboratory conditions (on specimens) and on structures. However, it requires a demanding experimental - computational procedure, which is accomplished here using the developed routine. Additionally, the behaviour of the pipe under internal pressure, including fracture mechanics parameters determination, is modelled numerically (by finite element method) in software package Abaqus. The pressure is applied as distributed load acting on the inner surface of the three-dimensional model, and axial tension is applied at the end of the pipe to simulate the closed end. J integral values determined numerically and using direct method are used for estimation of the critical pressure corresponding to the crack growth initiation. Additionally, plastic limit load, i.e. pressure which causes yielding of the ligament, is determined. Based on the results, criteria for pipe integrity assessment are discussed.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Advances in Fracture and Damage Mechanics X
T1  - API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters
EP  - +
SP  - 577
VL  - 488-489
DO  - 10.4028/www.scientific.net/KEM.488-489.577
ER  - 

@conference{
author = "Rakin, Marko and Međo, Bojan and Arsić, Miodrag and Šarkočević, Živče and Ivanović, I. and Sedmak, Aleksandar",
year = "2012",
abstract = "Seam casing pipe used in an oil drilling rig, manufactured by high frequency (HF) contact welding of API J55 steel, is tested. The influence of an initial defect (machined surface crack) is analysed, by performing pressure test of a pipe segment closed at both ends. Besides the damages at the internal surface, casing pipes are exposed to damage at the external surface, which is why such configuration is analysed here. Measurement of strains and crack mouth opening displacement (CMOD) enabled the application of direct method for J integral evaluation. This procedure is based on the path independence of the J integral and can be applied both in laboratory conditions (on specimens) and on structures. However, it requires a demanding experimental - computational procedure, which is accomplished here using the developed routine. Additionally, the behaviour of the pipe under internal pressure, including fracture mechanics parameters determination, is modelled numerically (by finite element method) in software package Abaqus. The pressure is applied as distributed load acting on the inner surface of the three-dimensional model, and axial tension is applied at the end of the pipe to simulate the closed end. J integral values determined numerically and using direct method are used for estimation of the critical pressure corresponding to the crack growth initiation. Additionally, plastic limit load, i.e. pressure which causes yielding of the ligament, is determined. Based on the results, criteria for pipe integrity assessment are discussed.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Advances in Fracture and Damage Mechanics X",
title = "API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters",
pages = "+-577",
volume = "488-489",
doi = "10.4028/www.scientific.net/KEM.488-489.577"
}

Rakin, M., Međo, B., Arsić, M., Šarkočević, Ž., Ivanović, I.,& Sedmak, A.. (2012). API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters. in Advances in Fracture and Damage Mechanics X
Trans Tech Publications Ltd, Durnten-Zurich., 488-489, 577-+.
https://doi.org/10.4028/www.scientific.net/KEM.488-489.577

Rakin M, Međo B, Arsić M, Šarkočević Ž, Ivanović I, Sedmak A. API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters. in Advances in Fracture and Damage Mechanics X. 2012;488-489:577-+.
doi:10.4028/www.scientific.net/KEM.488-489.577 .

Rakin, Marko, Međo, Bojan, Arsić, Miodrag, Šarkočević, Živče, Ivanović, I., Sedmak, Aleksandar, "API J55 Steel Casing Pipe with an Initial Surface Crack under Internal Pressure - Determination of Fracture Parameters" in Advances in Fracture and Damage Mechanics X, 488-489 (2012):577-+,
https://doi.org/10.4028/www.scientific.net/KEM.488-489.577 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Šarkočević, Živče
AU  - Međo, Bojan
AU  - Tomović, N.
AU  - Sedmak, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1975
AB  - The paper deals with the integrity assessment of API J55 steel casing pipes for drilling rigs, manufactured by high frequency contact welding procedure. The influence of corrosion defects on the pipeline load carrying capacity is determined through pressure test of a pipe with corrosion damages simulated by machining the circular holes. Finite element analysis of the damaged pipe subjected to internal pressure is used for determining the stress/strain conditions in the damaged area of the pipe. Also, numerical model was used for establishing the load carrying capacity of the pipe with different damage levels (i.e. defect depth and length). Several expressions from the literature are used for estimation of the maximum pressure in the damaged section of the pipe, and the solutions are compared with the predictions of finite element models and experimental results.
PB  - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
C3  - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
T1  - Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1975
ER  - 

@conference{
author = "Rakin, Marko and Arsić, Miodrag and Šarkočević, Živče and Međo, Bojan and Tomović, N. and Sedmak, Aleksandar",
year = "2012",
abstract = "The paper deals with the integrity assessment of API J55 steel casing pipes for drilling rigs, manufactured by high frequency contact welding procedure. The influence of corrosion defects on the pipeline load carrying capacity is determined through pressure test of a pipe with corrosion damages simulated by machining the circular holes. Finite element analysis of the damaged pipe subjected to internal pressure is used for determining the stress/strain conditions in the damaged area of the pipe. Also, numerical model was used for establishing the load carrying capacity of the pipe with different damage levels (i.e. defect depth and length). Several expressions from the literature are used for estimation of the maximum pressure in the damaged section of the pipe, and the solutions are compared with the predictions of finite element models and experimental results.",
publisher = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012",
journal = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF",
title = "Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1975"
}

Rakin, M., Arsić, M., Šarkočević, Ž., Međo, B., Tomović, N.,& Sedmak, A.. (2012). Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF
19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012..
https://hdl.handle.net/21.15107/rcub_technorep_1975

Rakin M, Arsić M, Šarkočević Ž, Međo B, Tomović N, Sedmak A. Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF. 2012;.
https://hdl.handle.net/21.15107/rcub_technorep_1975 .

Rakin, Marko, Arsić, Miodrag, Šarkočević, Živče, Međo, Bojan, Tomović, N., Sedmak, Aleksandar, "Damaged welded pipes for oil and gas rigs exposed to internal pressure - Failure estimation" in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF (2012),
https://hdl.handle.net/21.15107/rcub_technorep_1975 .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Međo, Bojan
AU  - Kozak, Drazan
AU  - Rakin, Marko
AU  - Burzić, Zijah
AU  - Sedmak, Aleksandar
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1360
AB  - The subject of this paper is investigation of the damage level of API J55 steel, used for manufacturing casing pipes by high frequency (HF) contact welding. The analysed pipe was withdrawn after about 70 000 hours of service in an oil drilling rig. Experimental analysis included determining the mechanical properties of the base material and welded joint, in particular the tensile and impact toughness testing. Fracture behaviour is examined by testing the modified compact tension (CT) specimens machined with a pre-crack in the base metal, weld metal and heat affected zone (HAZ). The critical value of the stress intensity factor K(Ic) is determined using the critical value of the J integral J(Ic). Fatigue crack growth rate and fatigue threshold stress intensity factor range are determined by three point bending tests of the Charpy specimens with a V-notch. The investigation conducted on specimens cut from the exploited pipe and the new pipe of the same grade revealed that material properties were not seriously altered during the analysed period of service.
T2  - Strojarstvo
T1  - Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes
EP  - 311
IS  - 4
SP  - 303
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1360
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Međo, Bojan and Kozak, Drazan and Rakin, Marko and Burzić, Zijah and Sedmak, Aleksandar",
year = "2009",
abstract = "The subject of this paper is investigation of the damage level of API J55 steel, used for manufacturing casing pipes by high frequency (HF) contact welding. The analysed pipe was withdrawn after about 70 000 hours of service in an oil drilling rig. Experimental analysis included determining the mechanical properties of the base material and welded joint, in particular the tensile and impact toughness testing. Fracture behaviour is examined by testing the modified compact tension (CT) specimens machined with a pre-crack in the base metal, weld metal and heat affected zone (HAZ). The critical value of the stress intensity factor K(Ic) is determined using the critical value of the J integral J(Ic). Fatigue crack growth rate and fatigue threshold stress intensity factor range are determined by three point bending tests of the Charpy specimens with a V-notch. The investigation conducted on specimens cut from the exploited pipe and the new pipe of the same grade revealed that material properties were not seriously altered during the analysed period of service.",
journal = "Strojarstvo",
title = "Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes",
pages = "311-303",
number = "4",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1360"
}

Šarkočević, Ž., Arsić, M., Međo, B., Kozak, D., Rakin, M., Burzić, Z.,& Sedmak, A.. (2009). Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes. in Strojarstvo, 51(4), 303-311.
https://hdl.handle.net/21.15107/rcub_technorep_1360

Šarkočević Ž, Arsić M, Međo B, Kozak D, Rakin M, Burzić Z, Sedmak A. Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes. in Strojarstvo. 2009;51(4):303-311.
https://hdl.handle.net/21.15107/rcub_technorep_1360 .

Šarkočević, Živče, Arsić, Miodrag, Međo, Bojan, Kozak, Drazan, Rakin, Marko, Burzić, Zijah, Sedmak, Aleksandar, "Damage Level Estimate of API J55 Steel for Welded Seam Casing Pipes" in Strojarstvo, 51, no. 4 (2009):303-311,
https://hdl.handle.net/21.15107/rcub_technorep_1360 .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Mladenović, Mladen
AU  - Jaković, Dragan
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1387
AB  - The selection of steel, the dimensions and methods of seam welded steel tubes fabrication are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. The paper presents the results of the mechanical properties of spiral welded pipes, the two production processes with different welding parameters. Tubes designed for oil and gas pipelines are made by welding the powder (EPP) steel increased strength of API X60.
AB  - Izbor čelika, dimenzija i načina proizvodnje zavarenih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje cevi definiše se karakteristikama koje one moraju posedovati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati ispitivanja mehaničkih osobina spiralno zavarenih cevi, za dva proizvodna procesa sa različitim parametrima zavarivanja. Cevi namenjene za naftovode i gasovode su izrađene zavarivanjem pod praškom (EPP) od čelika povećane čvrstoće API X60.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60
T1  - Uticaj parametara EPP postupka zavarivanja na mehaničke osobine spiralno zavarenih cevi od čelika API X60
EP  - 147
IS  - 4
SP  - 141
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1387
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Rakin, Marko and Međo, Bojan and Mladenović, Mladen and Jaković, Dragan",
year = "2009",
abstract = "The selection of steel, the dimensions and methods of seam welded steel tubes fabrication are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. The paper presents the results of the mechanical properties of spiral welded pipes, the two production processes with different welding parameters. Tubes designed for oil and gas pipelines are made by welding the powder (EPP) steel increased strength of API X60., Izbor čelika, dimenzija i načina proizvodnje zavarenih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje cevi definiše se karakteristikama koje one moraju posedovati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati ispitivanja mehaničkih osobina spiralno zavarenih cevi, za dva proizvodna procesa sa različitim parametrima zavarivanja. Cevi namenjene za naftovode i gasovode su izrađene zavarivanjem pod praškom (EPP) od čelika povećane čvrstoće API X60.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60, Uticaj parametara EPP postupka zavarivanja na mehaničke osobine spiralno zavarenih cevi od čelika API X60",
pages = "147-141",
number = "4",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1387"
}

Šarkočević, Ž., Arsić, M., Rakin, M., Međo, B., Mladenović, M.,& Jaković, D.. (2009). Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 54(4), 141-147.
https://hdl.handle.net/21.15107/rcub_technorep_1387

Šarkočević Ž, Arsić M, Rakin M, Međo B, Mladenović M, Jaković D. Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60. in Zavarivanje i zavarene konstrukcije. 2009;54(4):141-147.
https://hdl.handle.net/21.15107/rcub_technorep_1387 .

Šarkočević, Živče, Arsić, Miodrag, Rakin, Marko, Međo, Bojan, Mladenović, Mladen, Jaković, Dragan, "Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60" in Zavarivanje i zavarene konstrukcije, 54, no. 4 (2009):141-147,
https://hdl.handle.net/21.15107/rcub_technorep_1387 .

TY  - JOUR
AU  - Šarkočević, Živče
AU  - Arsić, Miodrag
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1296
AB  - The selection of steel, the dimensions and methods of fabricating seam welded steel tubes are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. In the paper are described quality indicator research results of seam welded tubes made of high strength steels X60 and J55, dedicated for producing oil and gas pipelines and in oil wells. Spiral welded tubes are produced by submerged arc welding (SAW), and the longitudinal welded pipes by high frequency welding technique. .
AB  - Izbor čelika, dimenzija i načina proizvodnje šavnih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje šavnih cevi definiše se karakteristikama koje cevi moraju imati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati istraživanja pokazatelja kvaliteta šavnih cevi izrađenih od čelika povišene čvrstoće X60 i J55, namenjenih za izradu cevi za naftovode, gasovode i bušotine. Spiralno zavarene cevi izrađuju se zavarivanjem pod praškom (EPP), a uzdužno zavarene, visoko-frekventnim postupkom zavarivanja (VF). .
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Fabrication of high strength seam welded steel tubes and quality indicator testing
T1  - Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta
EP  - 98
IS  - 2
SP  - 81
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1296
ER  - 

@article{
author = "Šarkočević, Živče and Arsić, Miodrag and Rakin, Marko and Sedmak, Aleksandar",
year = "2008",
abstract = "The selection of steel, the dimensions and methods of fabricating seam welded steel tubes are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. In the paper are described quality indicator research results of seam welded tubes made of high strength steels X60 and J55, dedicated for producing oil and gas pipelines and in oil wells. Spiral welded tubes are produced by submerged arc welding (SAW), and the longitudinal welded pipes by high frequency welding technique. ., Izbor čelika, dimenzija i načina proizvodnje šavnih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje šavnih cevi definiše se karakteristikama koje cevi moraju imati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati istraživanja pokazatelja kvaliteta šavnih cevi izrađenih od čelika povišene čvrstoće X60 i J55, namenjenih za izradu cevi za naftovode, gasovode i bušotine. Spiralno zavarene cevi izrađuju se zavarivanjem pod praškom (EPP), a uzdužno zavarene, visoko-frekventnim postupkom zavarivanja (VF). .",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Fabrication of high strength seam welded steel tubes and quality indicator testing, Izrada šavnih cevi od čelika povišene čvrstoće i ispitivanje pokazatelja kvaliteta",
pages = "98-81",
number = "2",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1296"
}

Šarkočević, Ž., Arsić, M., Rakin, M.,& Sedmak, A.. (2008). Fabrication of high strength seam welded steel tubes and quality indicator testing. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 8(2), 81-98.
https://hdl.handle.net/21.15107/rcub_technorep_1296

Šarkočević Ž, Arsić M, Rakin M, Sedmak A. Fabrication of high strength seam welded steel tubes and quality indicator testing. in Integritet i vek konstrukcija. 2008;8(2):81-98.
https://hdl.handle.net/21.15107/rcub_technorep_1296 .

Šarkočević, Živče, Arsić, Miodrag, Rakin, Marko, Sedmak, Aleksandar, "Fabrication of high strength seam welded steel tubes and quality indicator testing" in Integritet i vek konstrukcija, 8, no. 2 (2008):81-98,
https://hdl.handle.net/21.15107/rcub_technorep_1296 .