The effect of general and localized corrosions on the collapse pressure of subsea pipelines

Chen, Bai-Qiao; Xin-hu, Zhang; Soares, C. Guedes

doi:10.1016/j.oceaneng.2022.110719

Cited by 31 publications

(11 citation statements)

References 33 publications

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“…In addition, the ratios values of semi-elliptical shape a/c and a/t have been evidenced effects of these factors on the safety of piping systems. The obtained results are plotted in Figures 7 and 9, where the Figure 7 evidences the effect of the geometry of longitudinal defects on the safety of pipeline, and in Figure 9 shows the effect of geometry of depth defect on pipeline [15]. The obtained results in Figures 8 and 10 are provided as solutions of defects which lead to prevent from the corrosion issue in semi-elliptical defect.…”

Section: Test Results and Analysis Experimental Methodsmentioning

confidence: 94%

“…Depending on the ultimate strength the maximum value of the ultimate stress of the defect at the ratio a/t = 0.2 almost conforms to API 5L standard andas mentioned above. Thus the results of ultimate strength of a/t = 0.2 and a/t = 0.5 can explain that the variation of the depth shape (a) for semi-elliptical geometry has great effect on the behavior of defects and security of piping systems [14][15][16].…”

Section: Ratio Of 0 < A/t ≤ 08mentioning

confidence: 89%

“…In addition, the corrosion phenomenon which is one of the dangerous advanced steps, leads to weak of the structures of the piping systems and damaged under burst pressure of defects general corrosion [14,15], including the small cracks or different cracks that become critical zones [15,17]. Due to the occur of the complex chemical reactions, the corrosion issue in the piping systems influenced to loss of mineral represented by the brown layer and to decrease of the thickness in lifetime, where the pitting forms change and turn into semi-elliptical depth or length depending on the nature of materials and operating conditions [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

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The aim of the project is to study experimentally the influence of the semi-elliptical defect on the steel of grade API 5L X52 pipeline and its reparation by welding operation to keep the safety of hydrocarbons transport network. The tests have been performed on the specimens with/without semi-elliptical defects by using two ratios a/c and a/t, where the defects issue on the piping systems wall is treated by using the welding operation, which focuses on the filling the defected surface as same thickness of the base wall of the pipeline after removing the defects. The decrease of ultimate stress is mainly evident depending on the size of crack, where they compared to the base metal results. The experimental results showed that the reliability of the welding operation is proved especially in the ratio a/c =1, which is similar to that found in automatically welded. It is proved that the ratio a/t = 0.2 curve exhibits similarity to the base metal curve and their elongation conforms to API standard of steel X52 grade. Clearly, corrosion defects cause degradation of mechanical property in the order of 44% to 50% depending on the ratio of 0 < a/c ≤1 and from 20% to 80% according to the second ration of 0 < a/t ≤0.8. The obtained results proved that the enhanced of mechanical properties by welding reaches to ultimate stress is 559 MPa for the ratio a/t = 0.2 and 531 MPa for the ratio a/t = 0.5. Finally, the experimental results provided that the impact of semi-elliptical defect has effects on the safety of piping systems where welding became as one of among solutions to repair the piping systems.

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Section: Test Results and Analysis Experimental Methodsmentioning

confidence: 94%

Section: Ratio Of 0 < A/t ≤ 08mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

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“…As various industries such as oil and gas developed, steel pipes have become longer and more complicated, installed underground and subsea, and some of them are more than 50 years old. Corrosion in piping is caused by acidic gases, hydrogen sulfide, humidity, and pressure [ 1 , 2 ]. If the corrosion is left unchecked for a long time, problems such as leakage accidents and loss of productivity in plants arise [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Ito,

Igarashi,

Odagiri

et al. 2024

Sensors

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A new nondestructive inspection method, the magnetic hammer test (MHT), which uses a compact and highly sensitive tunnel magnetoresistance (TMR) sensor, is proposed. This method complements the magnetic flux leakage method and eliminates the issues of the hammer test. It can therefore detect weak magnetic fields generated by the natural vibration of a pipe with a high signal-to-noise ratio. In this study, several steel pipes with different wall thicknesses were measured using a TMR sensor to demonstrate the superiority of MHT. The results of the measurement show that wall thickness can be evaluated with the accuracy of several tens of microns from the change in the natural vibration frequency of the specimen pipe. The pipes were also inspected underwater using a waterproofed TMR sensor, which demonstrated an accuracy of less than 100 μm. The validity of these results was by simulating the shielding of magnetic fields and vibration of the pipes with the finite element method (FEM) analysis. The proposed noncontact, fast, and accurate method for thickness testing of long-distance pipes will contribute to unmanned, manpower-saving nondestructive testing (NDT) in the future.

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“…One example is general degradation caused by a corrosive environment. The general corrosion degradation leads to non-uniform thickness reduction [6]. The incorrect assumption about constant wave velocity may lead to inaccuracies in damage detection and localization due to changes in the dispersion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis of guided wave propagation in plate-like structures with sinusoidal thickness variations

Zima

Moll

2022

Archiv.Civ.Mech.Eng

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Guided waves have attracted significant attention for non-destructive testing (NDT) and structural health monitoring (SHM) due to their ability to travel relatively long distances without significant energy loss combined with their sensitivity to even small defects. Therefore, they are commonly used in damage detection and localization applications. The main idea of incorporating guided waves in NDT and SHM is based on processing the received signals and appropriate interpretation of their characteristics. A great amount of research devoted to diagnostics of plate-like structures considers specimens with constant thickness, which significantly facilities the diagnostic process. In such a case the velocity is also assumed to be constant. However, the developed diagnostic methods should be applicable, especially for the structures exposed to an aggressive environment, excessive load, or unfavorable weather conditions, etc., when the probability of damage occurring is much higher. In such cases, the assumption about the uniform thickness alongside the propagation path cannot be applied in every case. Thus, the present study is focused on wave propagation in metallic plates with variable thickness. The results of theoretical, numerical and experimental investigations of antisymmetric Lamb mode propagation in aluminum plates with a sine-shaped surface are presented. In the first step, the influence of non-uniform thickness distribution on wave velocity has been described. Next, the inverse problem aimed at shape reconstruction based on time of flight (ToF) analysis and spatially varying wave velocity was solved and compared with the standard dispersion curve-fitting method.

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The effect of general and localized corrosions on the collapse pressure of subsea pipelines

Cited by 31 publications

References 33 publications

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Theoretical and experimental analysis of guided wave propagation in plate-like structures with sinusoidal thickness variations

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