Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Cai, Jie; Jiang, Xiaoli; Lodewijks, Gabriël

doi:10.1080/17445302.2017.1308214

Cited by 34 publications

(23 citation statements)

References 71 publications

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“…There are many semi-empirical models which include: ASME B31G, modified ASME B31G, RSTRENG 0.85, SHELL92, DNV, PCORRC, Chell limit, Sims pressure and Ritchie, etc. to assess the durability condition of corroded pipelines [6][7][8][9][10][11]. The basic assumption of an empirical model is that the reduction of strength due to corrosion is corresponding to the amount of material loss measured along the length of the pipe.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the burst pressure for defective pipelines using different semi-empirical models

Budhe

Barros

2020

Frattura Ed Integrità Strutturale

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The main aim of this work is to predict the theoretical burst pressure of defective pipelines using different semi-empirical models and compare them with the hydrostatic test results. A new methodology was formulated with accounting for a minimum thickness (weakest section of the pipe) over the length of the pipe to predict the most conservative burst pressure. With a simple analytical expression, a reasonable accuracy and more conservative burst pressure can be obtained for any arbitrary defect shapes. A variation of burst pressure was found between theoretical prediction and hydrostatic burst test results with respect to the different semi-empirical models even for the same corroded defects. Different defect geometry shape and pipe material conditions are the possible causes for variation in the burst pressure between the semi-empirical models, so a careful selection of these parameters is necessary. The proposed methodology predicted a more conservative burst pressure for all arbitrary defects shapes and can predict reasonably accurate values if it accounts for the axial stress.

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Section: Introductionmentioning

confidence: 99%

Prediction of the burst pressure for defective pipelines using different semi-empirical models

Budhe

Barros

2020

Frattura Ed Integrità Strutturale

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“…The total length of subsea pipelines has rapidly increased while the seabed fossil energy resources have been highly explored. Subsea pipelines have a very high risk of fracture and leak due to the deformation and displacement caused by seabed moving, thermal expansion buckling, and spanning when the sediment below the pipeline is washed away by ocean currents [1]- [3]. Pipeline fracture and leakage will lead to substantial economic losses, serious environmental pollution, and even ecological disasters.…”

Section: Introductionmentioning

confidence: 99%

Low-Cost and High-Efficiency Method for Detecting Vertical Bends of Subsea Pipelines

et al. 2020

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Subsea pipelines often bend upward due to vertical buckling or downward due to spanning and seabed settling. Typically, harsh environments and the difficulty of accessing underwater pipelines make the inspection and monitoring of subsea pipeline bends a challenging task. This paper demonstrates a lowcost, high-efficiency, and quasi-real-time method for detecting the vertical bends of subsea pipelines by using an in-pipe spherical detector (SD) with rolling features and a low blockage risk. When the SD rolls forward inside a bent pipeline, its rolling speed will change as it moves uphill and downhill, which can be indicated by the centripetal acceleration-the DC component of the recorded rolling acceleration signals. To achieve a high bend detection performance, the mass of the SD should be distributed in a centered disc area to make the SD capable of stably rolling around one of the sensitive axes of the accelerometer, and the accelerometer should be kept as far from the rotation axis as possible. It is experimentally demonstrated that a convex/concave DC component indicates that the pipe is bent downward/upward, and the bend detection resolution can reach 1 cm for a 12 m pipeline.

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“…On the other hand, it is extremely expensive and complicated to maintain and repair damaged subsea pipelines. There are many factors that can cause subsea pipeline to fatigue, [1]- [3] including chemical corrosion, scour erosion by the internal and external flows, and large external force or deformation, such as trawl and anchor dragging, spanning and vibration due to ocean current scouring, earthquake, and seabed displacement. Among those external force damages, the spanning vibration often occurs and occupies a large proportion.…”

Section: Introductionmentioning

confidence: 99%

Vibration Detection of Spanning Subsea Pipelines by Using a Spherical Detector

et al. 2019

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This paper proposes a method for detecting the vibration of subsea spanning pipelines by using a spherical detector (SD) equipped with a triaxial accelerometer. The mathematical analyses and experiments demonstrate that the acceleration modulus square (AMS) and the AMS of the ac components (AMS_AC) of the acceleration signals recorded by the SD have one characteristic component whose frequency is equal to and can be used to determine the pipeline vibration frequency. As the amplitude of this component is immune to the rotation noises of the SD, its signal-to-noise ratio is higher than that of other components whose frequencies are the mixture of the vibration and rotation frequencies. Removing the dc bias along the three sensitive axes can eliminate other characteristic frequencies to make the AMS_AC having the unique frequency to indicate the pipeline vibration. The vibration frequency can be accurately and sensitively identified by using the AMS_AC. The detection thresholds of 5-, 10-, and 15-Hz vibrations are 0.6, 0.4, and 0.2 mm with regard to the amplitude, respectively.

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Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Cited by 34 publications

References 71 publications

Prediction of the burst pressure for defective pipelines using different semi-empirical models

Prediction of the burst pressure for defective pipelines using different semi-empirical models

Low-Cost and High-Efficiency Method for Detecting Vertical Bends of Subsea Pipelines

Vibration Detection of Spanning Subsea Pipelines by Using a Spherical Detector

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