Vibration Detection of Spanning Subsea Pipelines by Using a Spherical Detector

Guo, Lin; Zeng, Zhoumo; Huang, Xinjing; Li, Jian; Chen, Shili

doi:10.1109/access.2018.2890024

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…This method also has some drawbacks that are not related to spiral weld localization, but related to pipeline defect detection. The SD can only detect the existence of spiral weld and girth weld, as well as large deformation and vibration of pipeline [30][31][32], but cannot detect weld defects and local corrosion defects of pipe wall, especially the upper side, left side, and right side which are far away from the SD. This is because that the diameter of the SD is smaller than the diameter of the pipe, the SD cannot contact the pipe wall.…”

Section: Further Discussionmentioning

confidence: 99%

“…The SD has been used in the detection of magnetic anomalies in pipelines, and can identify girth welds from the measured magnetic signals, but cannot identify spiral welds [30]. Afterwards, the structure of SD was optimized to achieve fixed-axis rotation by adding a tungsten disc as counterweight to improve the quality of detected signals [31][32]. However, the existing SD is still unable to locate the crosspoint of spiral and girth welds.…”

Section: Introductionmentioning

confidence: 99%

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Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

Huang

et al. 2020

IEEE Access

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Crosspoint of spiral and girth welds of spiral steel pipelines transporting high-pressure oil and gas is easy to crack due to welding defects and corrosion, so routine excavation and careful inspection are required. In order to reduce the workload and cost of excavation, it is necessary to determine the crosspoint's angular position on the girth weld. This paper proposes a low-cost and high-efficiency method for locating the spiral-girth weld crosspoint based on the inner Spherical Detector (SD). Theoretical analysis and experiments demonstrate that the magnetometer with a smaller lift-off could detect more noticeable magnetic valley of the spiral welds at the pipe bottom, so a smaller SD should be used; the spiral direction can be determined by the phase difference of the dual-channel magnetic signals, when dual magnetometers are symmetrically fixed about the median vertical plane on the rotation axis of the SD. When the girth weld, at least one spiral weld and the spiral direction are detected and determined, the crosspoint's angular position can be calculated. The maximum localization error of the crosspoint is less than 30° and the average error is less than 20°, that is, no more than one hour's angle, whose accuracy is sufficient for excavation and maintenance in the field, because it will reduce the amount of excavation by nearly half.

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Section: Further Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

Huang

et al. 2020

IEEE Access

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“…At present, pipeline trajectory measurements based on PIG and INS were only tested on pipelines no more longer than 2km [20]- [23]. INS based method is only applicable by PIGs that have high risk of blockage, but not suitable for the spherical detector (SD) [24]- [26] that has low risk of blockage and is capable of performing quasi real-time detection.…”

Section: Introductionmentioning

confidence: 99%

Lateral Pipeline Buckling Detection via Demagnetization and Interior Magnetic Measurement

Huang

et al. 2020

IEEE Access

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Thermal buckling of subsea pipelines often occurs and seriously threatens pipeline safety. The spherical detector (SD) can realize quasi real-time detection of pipeline buckling owing to its low blockage risk and convenient launch-retrieval deployment. Vertical buckling can be judged by the rolling speed of the SD, while lateral buckling can only be judged by the interior magnetic fields. However, irregular magnetic remanence of the pipeline seriously hinders the magnetic detection of lateral buckling. To against this problem, this paper proposes a method of detecting the lateral pipeline buckling via demagnetization and interior magnetic measurement. It is experimentally demonstrated that demagnetization can remove most of the remanence of the pipeline and make the interior magnetic fields more regular and uniform; After the pipe is demagnetized, both severe and weak lateral bucklings can be sensitively indicated by the single or double peaks of the interior magnetic fields measured by the SD. The interior magnetic fields are also experimentally demonstrated capable of indicating the first and recurring weak buckling through comparing with the previous detection data.

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“…Through simulations and many field experiments, the passing ability of the SD, especially the ability to pass through vertical pipes, has been adequately verified [21]. In addition, versatile pipeline detection applications, such as 3D pipeline localization [22], pipeline inflection point and magnetic anomaly detection [23], pipeline inclination measurement [24], and vibration detection [25] for spanning pipelines, have fully demonstrated the robust detection ability of SDs and their advantage of quasi real-time detection. Therefore, the SD shows promise in the field of subsea pipeline detection.…”

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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Vibration Detection of Spanning Subsea Pipelines by Using a Spherical Detector

Cited by 11 publications

References 25 publications

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

Lateral Pipeline Buckling Detection via Demagnetization and Interior Magnetic Measurement

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

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