Markov chain modelling for time evolution of internal pitting corrosion distribution of oil and gas pipelines

Ossai, Chinedu I.; Boswell, Brian; Davies, Ian J.

doi:10.1016/j.engfailanal.2015.11.052

Cited by 54 publications

(28 citation statements)

References 39 publications

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“…In a recent study, a corrosion model was applied to propose simplified corrosion models [25]. Four (4) different corrosion years of aged gas pipeline were adopted in the previous study, i.e., 8,12,19, and 29 years which were obtained from the pigging test. It is well known that the pigging test requires high cost and time.…”

Section: Proposed Corrosion Modelmentioning

confidence: 99%

Safety assessment of corroded jacket platform considering decommissioning event

Kim¹,

Zalaya²,

Mohd³

et al. 2017

Int. J. Automot. Mech. Eng.

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Continuous assessment of aged offshore structures is becoming extremely important to avoid any hazardous consequences throughout their design life. In Malaysian waters where most of the offshore structures are jacket platforms, it was found that many of these structures are currently operating beyond their design life. With continuous corrosion taking place, structural reliability and operation will be affected. Therefore, for the safety evaluation, this study focuses on the reassessment of an existing aged jacket platform in Malaysian waters pertaining to corrosion effect. In this study, pushover analysis was carried out to determine the ultimate strength of the corroded jacket platform by quantifying the reserve strength ratio value. Two different time-dependent corrosion wastage models were used in the present study to simulate the corrosion behaviour at the splash zone of the jacket platform. It was observed that average corrosion condition relatively simulated the calm waters of Malaysia and by applying this corrosion, the jacket platform can withstand the environmental load acting on it. The results developed in the present study will be useful for future study in predicting and modelling corrosion tolerance of jacket platforms in Malaysian waters.

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Section: Proposed Corrosion Modelmentioning

confidence: 99%

Safety assessment of corroded jacket platform considering decommissioning event

Kim¹,

Zalaya²,

Mohd³

et al. 2017

Int. J. Automot. Mech. Eng.

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“…On the other hand, when the corrosion defect pit depth growth is between 0.21 mm/year to 0.38 mm/year, it is said to be undergoing a high corrosion rate, while a growth rate that is above 0.38 mm/year is classified as severe corrosion [21]. If the corrosion defect depth d(t) at time t of a corroded pipeline follows a power model [16][17][18] according to Equation [13], the time of initiation of the corrosion defects (t ini ) for different corrosion categories are low corrosion (t ini = 1.56 years), mild corrosion (t ini = 0.58 years), high corrosion (t ini = 1.03 years) and severe corrosion (t ini = 1.89 years) [22]. In this case, the burst pressure at different lifecycle durations and various corrosion categories can be computed with Equations (12a,b).…”

Section: Variability Of the Retained Strength Of The Corroded Pipelinesmentioning

confidence: 99%

Finite Element Modelling and Retained Life Estimation of Corroded Pipelines in Consideration of Burst Pressures—A Fractural Mechanics Approach

Ossai

2017

Infrastructures

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This study used Finite Element Modelling (FEM) to determine the relationship between the burst pressure (P b ) of internally, circumferentially corroded pipelines, with the corrosion defect depth (d), pipe wall thickness (t) and the pipe diameter (D). After modelling X46 and X52 grades of pipes, the P b estimated was compared with those determined experimentally and with industry standard models-ASME B31G (modified), RSTRENG, DNV F101, SHELL92 and FITNET FFS. The comparison specified a Root Mean Square Percentage Error (RMSPE) that ranged from 7.06% to 20.4% and a coefficient of determination (R 2 ) that varied from 0.7932 to 0.9813. Multivariate regression was also used to compute a general linear relationship between the burst pressure (P b ) and (d/t), (L/D) and (L/ √ Dt). The resulting FEM burst-pressure model, developed with multivariate regression, was later used to estimate the expected allowable operating pressure of a corroded X46 grade pipeline over the lifecycle duration, for low, mild, high and severe corrosion categories. It was observed that the burst pressure retention ratio (R r ), which is an indicator of the reliability of the pipeline, decreased with the increase in (d) but did not show distinctive changes with the increase in (L). Considering the robustness of the FEM developed in this study, it can be concluded that it will be very vital for flowline design and pipeline integrity management.

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“…The common local corrosion is pitting corrosion(holes) [1][2][3][4]. Pitting corrosion reduces the thickness of the casing wall, and causes stress concentration which seriously reduces the strength of casing, bring serious potential danger to the production of oil and gas [5][6][7][8]. Therefore the analysis and study the influence of pitting corrosion defect on casing strength has a great significance on selecting materials and extending the service life of the gas well.…”

Section: Introductionmentioning

confidence: 99%

The influence of double pitting corrosion on casing collapsing strength based on different ellipsoid shape

Yan

Zhang

Song

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Acidic environment always contributes on casing corrosion phenomenon, the local corrosion and pitting lead to stress concentration, which decreases the strength and is an important factor to cause damage to the casing. The influences of distance of two pitting, corrosion depth, section parameter on collapsing strength of casing are quantitatively analyzed under the condition of double pitting axial distribution and ring distribution. The results showed that the maximum Von Mises stress of casing first increases, and then goes down to a steady state as the distance of double pitting grows under the condition of double pitting axial distribution, while the stress goes down to a steady state as the distance of double pitting grows under the condition of double pitting ring distribution. It can provide the theoretical foundation for the casing design through analyzing and comparing the influence of double pitting on the collapsing strength of casing under different condition.

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Markov chain modelling for time evolution of internal pitting corrosion distribution of oil and gas pipelines

Cited by 54 publications

References 39 publications

Safety assessment of corroded jacket platform considering decommissioning event

Safety assessment of corroded jacket platform considering decommissioning event

Finite Element Modelling and Retained Life Estimation of Corroded Pipelines in Consideration of Burst Pressures—A Fractural Mechanics Approach

The influence of double pitting corrosion on casing collapsing strength based on different ellipsoid shape

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