Failure resistance of drilling rig casing pipes with an axial crack

Medjo, Bojan; Rakin, Marko; Gubeljak, Nenad; Matvienko, Yu. G.; Arsić, Miodrag; Šarkoćević, Živče; Sedmak, Aleksandar

doi:10.1016/j.engfailanal.2015.05.015

Cited by 31 publications

(20 citation statements)

References 32 publications

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“…PRNB specimen geometry is shown in Figure 1; the stress concentrator marked in the figure can generally be a machined notch (used in this work) or a fatigue pre-crack. In previous studies [28][29][30][31] we have mainly focused on preparation and examination of the new specimen shape based on the ring geometry. The specimens were cut from bulk steel/plates, and verified against the standard SENB specimen, which has similar character of loading and stress concentrator geometry as PRNB specimen.…”

Section: Specimens and Testingmentioning

confidence: 99%

“…Fracture mechanics parameters are considered previously [29], as well as calculation of J integral for these geometries [28]. Also, for the purpose of verification against a standard specimen, fracture behaviours of PRNB and SENB specimen were compared [29,30,35]. The aim was to develop a new specimen geometry, which would be convenient, but also verified for practical application (primarily because of its shape), having in mind limitations of standard specimens in determining the fracture behaviour of pipelines.…”

Section: Specimens and Testingmentioning

confidence: 99%

“…However, the main focus in this work is testing the fracture behaviour of the thin-walled pipes with a defect in the other direction -axial, exposed to internal pressure. Specimen type used for this purpose is recently proposed as pipe ring notched bending specimen (PRNB) [28][29][30][31][32]. Regarding the axial defect position, which is critical in cylindrical geometries exposed to internal pressure, there are also some other proposed non-standard specimens (besides PRNB), such as curved compact tension (CCT) specimens [33], or several other configurations [34].…”

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confidence: 99%

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Seam pipes for process industry-fracture analysis by using ring-shaped specimens

Musraty¹,

Medjo²,

Gubeljak

et al. 2018

Hem Ind

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Pipelines are commonly used in process industry for transport of fluids, as well as granular solids, due to their numerous advantages in comparison to other transportation means. Pipe integrity is essential for a reliable work of the entire plant, as well as for safety assurance. Also, serious ecological consequences may follow the pipeline failure in some cases, i.e. due to the leak of toxic, flammable or otherwise dangerous fluids in a chemical or some other plant. Therefore, it is very important to examine the fracture behaviour of pipelines, which is done here by testing the recently proposed ring-shaped specimens exposed to bending. The specimens were fabricated from a seam pipe for pressure applications (allowed for usage on temperatures up to 300 °C). Initial defects, very narrow notches, were machined either in the base metal and weld metal (seam) or in the base metal only. Regardless of the defect position, ductile fracture mechanism is observed in all specimens. The results show that the ring-shaped specimen can be successfully used for fracture characterisation of pipeline material, especially for thin-walled pipes which are not suitable for production of standard fracture mechanics specimens due to the insufficient wall thickness.

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Section: Specimens and Testingmentioning

confidence: 99%

Section: Specimens and Testingmentioning

confidence: 99%

mentioning

confidence: 99%

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Seam pipes for process industry-fracture analysis by using ring-shaped specimens

Musraty¹,

Medjo²,

Gubeljak

et al. 2018

Hem Ind

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“…Ovaj pravac izložen je dejstvu obimnog napona, dominantnog kod cilindričnih struktura izloženih unutrašnjem pritisku. U prethodnom periodu, predložena je epruveta oblika prstena za savijanje (u tri tačke) -PRNB, pipe ring notched bending [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. U literaturi postoje i drugi predlozi za ovaj položaj defekta, [17,18], ali po pravilu podrazumevaju složen postupak pripreme epruvete ili ispitivanja, a u nekim slućajevima i izradu i prilagođavanje pomoćnog pribora konkretnoj geometriji ispitivane epruvete.…”

Section: Uvodunclassified

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

Međo

Metallurgy

Musrati

et al. 2018

Proceedings of the 31st International Congress on Process Industry

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Integritet cevovoda i drugih elemenata opreme pod pritiskom je veoma važan za pouzdan i bezbedan rad postrojenja u procesnoj industriji. Otkazi opreme mogu, uz ugrožavanje sigurnosti zaposlenih i ekonomske gubitke, u nekim slučajevima izazvati ozbiljne ekološke posledice, ukoliko dođe do ispuštanja otrovnih, zapaljivih ili na drugi način opasnih fluida. Stoga, veoma je važno poznavati ponašanje cevi pri lomu ili drugim oblicima otkaza. Problem pri korišćenju standardnih epruveta predstavlja potrebna debljina uzorka, kao posledica zahteva za dominantnim ravnim stanjem deformacije. U ovom radu, otpornost prema lomu je određena primenom epruveta oblika prstena izloženih savijanju, kao nestandardnih epruveta predloženih u prethodnom periodu. Početni koncentrator napona (žleb ili zamorna prslina) je formiran u uzdužnom pravcu; opterećenje ove epruvete simulira dejstvo unutrašnjeg pritiska u cevi. Epruvete su izrađene od cevi za primenu na povišenoj temperaturi. Rezultati pokazuju da se epruvete oblika prstena mogu koristiti za karakterizaciju loma materijala cevovoda i posuda malih prečnika, posebno za tankozidne strukture koje nisu pogodne za izradu standardnih epruveta mehanike loma (poput elemenata sistema za skladištenje i distribuciju fluida -kiseonika, vodonika, azota, vode / vodene pare, tečnih i gasovitih goriva, itd.). Ključne reči: Otkaz nosivosti cevi; Epruveta oblika prstena za savijanje; Žilav lom; Stereometrijsko beskontaktno merenje deformacijaIntegrity of pipelines and other pressurised equipment elements is very important for reliable and safe exploitation of the process industry plants. Equipment failures can, in addition to endangering the safety of personnel and economic losses, in some cases cause serious ecological consequences, if some toxic, flammable or otherwise dangerous material is released. Therefore, it is very important to understand the behaviour of the pipes during fracture or other failure modes. The problem which arises if standard specimens are applied is the required thickness of the specimen, as a consequence of the plane strain requirement. In this work, fracture resistance is determined by application of ring-shaped specimens exposed to bending, as nonstandard specimens proposed recently. Initial stress concentrator (notch or fatigue pre-crack) is formed in axial direction; loading of this specimen simulates the internal pressure in the pipe. The specimens are fabricated from the pipes for usage on elevated temperature. The results show that the ring-shaped specimens can be applied in fracture characterisation of pipeline / small-diameter vessel material, especially for thin-walled structures which are not convenient for fabrication of standard fracture mechanics specimens (such as elements of systems for transport and distribution of fluids -oxygen, hydrogen, nitrogen, water / steam, liquid and gaseous fuels, etc.).

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“…Based on the precise examination, regarding the defect type and size, as well as on calculation of operating ability of the welded joint, the decision, referring to possibility of reintegrating the pipe into the system, can be made [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Fault Tree Analysis of Causes of the Welded Pipes Failures in Exploitation

Nikolić¹,

Arsić²,

Arsić³

et al. 2020

Komunikácie

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Premature failure or damage of parts and components of the oil and gas well piping, as well as pipelines for transport of oil and gas, are generally caused by the simultaneous influence of a large number of technological, metallurgical, structural and exploitation factors. Therefore, the convenient structural solutions, which provide the mechanical safety of parts and integrity of structures, can be realized only through total comprehension of their behavior in various operation regimes. Importance of technical diagnostics for monitoring and state analysis of welded pipes/pipelines in oil industry is considered in this paper. An analysis of causes of the welded pipes failures in exploitation has been performed through use of the fault tree analysis. Based on the suggested structure of a database, regarding the causes of failure, possibilities are presented to set measures for prevention of damage and failure of welded pipes/pipelines and for extension of their service life. A suggestion for improvement of the organizational scheme for monitoring the state and maintenance of welded pipes/pipelines during the exploitation has been made, as well.

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Failure resistance of drilling rig casing pipes with an axial crack

Cited by 31 publications

References 32 publications

Seam pipes for process industry-fracture analysis by using ring-shaped specimens

Seam pipes for process industry-fracture analysis by using ring-shaped specimens

Određivanje otpornosti prema lomu materijala cevovoda primenom epruveta oblika prstena

The Fault Tree Analysis of Causes of the Welded Pipes Failures in Exploitation

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