Investigation of the Effect of Local Buckling and VIV Fatigue on Failure Probability of Subsea Pipelines in Iranian South Pars Gas Field

Taheri, Abdolrahim; Shabani, Mahdi; Daghigh, Mohammad

doi:10.29252/ijmt.9.23

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…It is a process which is generated from the intervention of a pipeline with the environment [19]. First, they are generated from the intervention of the wave with the flow and include gravitational forces such as net weight, buoyancy, and hydrostatic pressure [20].…”

Section: Hydrodynamic Loadsmentioning

confidence: 99%

Free Span Analysis for Submarine Pipelines

Pour

Taheri

abyaneh

2021

Shock and Vibration

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Pipelines are one of the most important and key elements that align with transferring hydrocarbon products in coastal and offshore industries which are exposed at various risks during their servicing. In this project, we are studding and describing free spanning of marine pipeline based on DNVGL-RP-F-105 regulation applying the finite element method by Abaqus software. For modeling, case studies of Gorze to Kish oil pipeline have been used. In order to provide and study the integrity of the structure against fatigue, the exact place as well as the free span length using software under environmental loading based on DNVGL-RP-F205 has been determined. Since based on DNVGL-TS-F101 free span causes local buckling, fatigue, and pipe burst then given to the servicing as well as environmental conditions, pipe condition has been monitored. Finally, using sensitivity analysis, the effect of different soil classes, elasticity module, and temperature on the pipe condition has been studied. At the end, the question if it is allowed to use a cross model for bed has been answered in previous studies.

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Section: Hydrodynamic Loadsmentioning

confidence: 99%

Free Span Analysis for Submarine Pipelines

Pour

Taheri

abyaneh

2021

Shock and Vibration

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“…Residual tension during installation was not considered in this study. The reasons for neglecting the residual tension are that those axial forces are generally associated with a high degree of uncertainty and their influence is very case-specific [13].Pipeline Submerged Weight in Operation Condition is equal to 4273( ). Table1 presents the general parameters of pipelines.…”

Section: Case Studymentioning

confidence: 99%

Reliability Analysis of Subsea Pipeline against Upheaval Buckling

Taheri

Tasdighi

Faraji

2019

ijcoe

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The importance of oil transportation in the maritime industry has increased in recent years due to increased oil and gas production. According to technical and financial aspects, on hydrocarbon transfer methods, the pipelines are the best option for the transfer of oil and gas in the maritime industry. High temperature and high pressure in the pipeline can lead to the buckling. Buckling can either be in the direction of vertical (upheaval) and horizontally (lateral). The uncertainty in the buckling parameters of the pipeline increases error in the uplift and the effective axial compressive force calculation. The existence of these errors in the pipeline design is costly for the project. So reducing the errors can be very important. This paper presents the reliability analyses for studying and quantifying the variation of the reliability index (β) with the main parameters involved during the upheaval buckling of submarine buried pipes caused by high temperature and pressure conditions (HTHP). In this paper, uncertainty is considered in the geometric parameters of the pipeline. PDF and reliability index (β) can be determined by FORM and other. FORM, FOSM and sampling methods are three main methods which are used to account the PDF and reliability index (β). This research shows that among these three methods, for a fixed state, the sampling method has the lowest beta and the highest probability of buckle, which has a higher accuracy than the other methods. For soil cover with a thickness of more than 1000, it is worth noting that by increasing the thickness of the soil cover, more force is required for the upheaval buckling in the pipeline.

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