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 Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service.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 .