Analyses of magnetic field in spiral steel pipe

Huang, Xinjing; Chen, Shili; Guo, Shixu; Jin, Shijiu

doi:10.1016/j.jmmm.2014.10.006

Cited by 3 publications

(4 citation statements)

References 16 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%

“…In addition, the prior condition that the period of weld arising is fixed and known can be used to further eliminate the interference signal. For the previous larger SD, because its magnetometer fluctuates and is far from the bottom of the pipeline and none of its sensitive axes overlaps the horizontal axis to measure the lateral magnetic component, the spiral weld cannot be magnetically detected [30]. Rotate the pipe…”

Section: A Magnetic Signals At Spiral Welds Mesured By the Small Sdmentioning

confidence: 99%

“…It is convenient to launch and retrieve the SD. The SD is not easy to get blocked and has high signal-to-noise ratio, so it is a promising new quasi real-time detection tool for pipelines [28][29][30]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…The SD is not easy to get blocked and has high signal-to-noise ratio, so it is a promising new quasi real-time detection tool for pipelines [28][29][30]. 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].…”

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: A Magnetic Signals At Spiral Welds Mesured By the Small Sdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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A 3D Localization Approach for Subsea Pipelines Using a Spherical Detector

et al. 2017

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Inversion of magnetic fields inside pipelines: Modeling, validations, and applications

Huang

Chen

Zhang

et al. 2017

Structural Health Monitoring

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Spherical detector is a novel and promising approach for pipeline inspections with high signal-to-noise ratio and low risk of blockage. As the magnetic signals are recorded in a rotating frame by the rolling spherical detector, it is difficult to directly deploy the raw periodic signals for magnetic inspections, such as pipeline orientation calculations and the identifications of girth welds, turning points, and other pipe features. Against this backdrop, a magnetic inversion approach for transforming the measured magnetic signals from the rotating sensor frame into the stationary pipe frame is developed and demonstrated both analytically and experimentally. By comparing the transformed values with that measured by a sensor moving on a straight route, the inversion approach is proven to hold for an arbitrary fixed rotation axis, with the average and maximum errors mostly less than 1 and 2 µT, respectively. Field experiments demonstrate that the magnetic inversion can expose and enhance hidden or imperceptible magnetic anomalies and pipeline turning points and improve pipeline route calculation accuracy via secondary alignments. The results will promote the spherical detector to play a greater role in pipeline inspections.

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Analyses of magnetic field in spiral steel pipe

Cited by 3 publications

References 16 publications

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

Crosspoint Localization of Spiral and Girth Welds of Spiral Steel Pipelines

A 3D Localization Approach for Subsea Pipelines Using a Spherical Detector

Inversion of magnetic fields inside pipelines: Modeling, validations, and applications

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