Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Reexamination Certificate
2006-03-27
2008-08-19
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
C324S228000, C324S238000
Reexamination Certificate
active
07414395
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.
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Gao Ming
Limon Sergio
McNealy Richard Clark
Sherstan Ron
Aurora Reena
General Electric Company
Nixon & Vanderhye P.C.
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