Structural life assessment of oil rig pipes made of api j55 steel by high frequency welding
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.
Keywords:
axial surface crack / number of cycles to failure N-(sic) / oil rig pipesSource:
Tehnicki vjesnik-Technical Gazette, 2013, 20, 6, 1091-1094Publisher:
- University of Osijek, Tech Fac, Slavonski Brod
Funding / projects:
- Ministry of Education and Science of R. Serbia [EVB: TR 35002]
Institution/Community
Tehnološko-metalurški fakultetTY - 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 .