Method and apparatus inspecting pipelines using magnetic flux sensors
First Claim
1. A method for detecting stress corrosion cracking (SCC) of pipelines, comprising:
- identifying pipeline locations and pipeline conditions that are amenable to inspection by a magnetic flux tool;
performing two inspections on the pipeline, one inspection is performed to collect the magnetic flux inline (MFL) data and a separate inspection is performed to collect transverse magnetization flux lines (TFI) data, wherein the MFL data and TFI data are distinct;
after collection of the TFI data and the MFL data, aligning separate signals descriptive of pipeline features generated from each of the MFL data and the TFI data, wherein the alignment includes presenting the separate signals simultaneously to show the same pipeline feature;
evaluating a number of pipeline features indicated by the aligned separate signals from the MFL data and TFI data, the features including potential crack field features and potential corrosion features, andbased upon results of the evaluation identifying potential crack fields for physical inspection.
1 Assignment
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Accused Products
Abstract
The method for detecting stress corrosion cracking (SCC) of pipelines, comprising the steps of: identifying pipeline locations and pipeline conditions that are amenable to inspection by a magnetic flux inline tool and by a TFI tool; performing two inspections on the pipeline, one inspection performed using the magnetic flux inline (MFL) tool and an other inspection performed using the TFI tool; aligning signal features resulting from the two inspections; identifying TFI signals occurring above a specified threshold; identifying MFL signals for a section of pipeline corresponding to the identified TFI signals; for the identified TFI signals, determining whether the MFL signals are below a second threshold level; designating the sections of the pipeline corresponding to identified TFI signals above the threshold and below the second threshold as a potential corrosion feature; identifying TFI signals that exceed a defined metal loss percentage; measuring a width and length of the signal features, and if the width and length of the signal feature exceed threshold crack width and length values, designating as a potential corrosion feature section of pipeline corresponding to the identified TFI signals.
51 Citations
20 Claims
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1. A method for detecting stress corrosion cracking (SCC) of pipelines, comprising:
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identifying pipeline locations and pipeline conditions that are amenable to inspection by a magnetic flux tool; performing two inspections on the pipeline, one inspection is performed to collect the magnetic flux inline (MFL) data and a separate inspection is performed to collect transverse magnetization flux lines (TFI) data, wherein the MFL data and TFI data are distinct; after collection of the TFI data and the MFL data, aligning separate signals descriptive of pipeline features generated from each of the MFL data and the TFI data, wherein the alignment includes presenting the separate signals simultaneously to show the same pipeline feature; evaluating a number of pipeline features indicated by the aligned separate signals from the MFL data and TFI data, the features including potential crack field features and potential corrosion features, and based upon results of the evaluation identifying potential crack fields for physical inspection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting stress corrosion cracking (SCC) of pipelines, comprising:
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identifying pipeline locations and pipeline conditions that are amenable to inspection by a magnetic flux inline tool and by a TFI tool; performing two inspections on the pipeline, one inspection performed using the magnetic flux inline (MFL) tool and an other inspection performed using the TFI tool; aligning signal features resulting from the two inspections; identifying TFI signals occurring above a specified threshold; identifying MFL signals for a section of pipeline corresponding to the identified TFI signals; for the identified TFI signals, determining whether the MFL signals are below a second threshold level; designating the sections of the pipeline corresponding to identified TFI signals above the threshold and below the second threshold as a potential corrosion feature; identifying TFI signals that exceed a defined metal loss percentage; measuring a width and length of the signal features, and if the width and length of the signal feature exceed threshold crack width and length values, designating as a potential corrosion feature section of pipeline corresponding to the identified TFI signals. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A computer program product stored on a computer readable medium for detecting stress corrosion cracking (SCC) of pipelines, the computer program product including instructions for performing:
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identifying pipeline locations and pipeline conditions that are amenable to inspection by a magnetic flux inline tool and by a transverse magnetization flux lines (TFI) tool; performing two separate inspections on the pipeline, one inspection performed using the magnetic flux inline tool and an other inspection performed using the TFI tool; aligning signal features resulting from the two inspections, wherein the alignment includes presenting simultaneously the signal features from the two inspections that show the same features of the pipeline; evaluating the aligned signal features, wherein the evaluation comprises; using the aligned signal features to identify pipeline features detected by the two inspections, the features including potential crack field features and potential corrosion features; and based upon results of the evaluating, performing at least one of;
excavating and inspecting all identified pipeline features and excavating and inspecting a selected group of the identified pipeline features. - View Dependent Claims (18, 19, 20)
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Specification