Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Reexamination Certificate
2006-12-26
2006-12-26
Lefkowitz, Edward (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
C324S238000
Reexamination Certificate
active
07154264
ABSTRACT:
The system and method provides a means for inspecting pipelines that have obstructions which prevent conventional inspection pigs from passing the obstructions. The invention uses remote-field eddy current inspection techniques and a uniquely configured excitation coil for inline inspection of pipelines having valves and other fittings that severely restrict or prevent the use of conventional inspection pigs. A unique collapsible excitation coil and a collapsible sensor array enables an inspection pig using these features to pass pipeline obstructions that prevent passage by conventional inspection pigs. The collapsible coil and sensor array provide means for reducing the diameter of an inspection pig to enable it to pass obstructions in the pipeline.
REFERENCES:
patent: 4769598 (1988-09-01), Krieg et al.
patent: 5623203 (1997-04-01), Hosohara et al.
“Application of Remote-field Eddy Current Testing to Inspection of Unpiggable Pipelines”, James Merritt, http://primis.rspa.dot.gov/rd/success.htm listed on document, publication date not available, two pages.
“Application of Remote-Field Eddy Current (RFEC) Testing to Inspection of Unpiggable Pipelines”, Gary L. Burkhardt, Quarterly status and progress report for period ending Mar. 31, 2003, publication date not availble, one page.
Burkhardt Gary L.
Crouch Alfred E.
Fisher Jay L.
Lefkowitz Edward
Schindler David M.
Southwest Research Institute
Taylor Russell & Russell P.C.
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