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RESEARCH PAPERS

Small Diameter Remote Field Eddy Current Inspection for Unpiggable Pipelines

[+] Author and Article Information
Albert Teitsma, Stephen Takach, Julie Maupin, Jennifer Fox, Paul Shuttleworth, Paul Seger

Distribution & Pipeline Technology Center,  Gas Technology Institute, 1700 South Mount Prospect Road, Des Plaines, IL 60018-1804

J. Pressure Vessel Technol 127(3), 269-273 (Feb 22, 2005) (5 pages) doi:10.1115/1.1991878 History: Received February 10, 2005; Revised February 22, 2005

In-line inspection tools cannot inspect most of the natural gas transmission pipelines and distribution mains due to restrictions in the pipelines that will not allow a tool equipped with current inspection technologies to pass. Remote field eddy current (RFEC) inspection is an excellent candidate for inspecting a pipeline with multiple diameters, valve and bore restrictions and tight or miter bends. The results of this paper show that the RFEC technique can inspect pipeline materials, and that all of the components needed for RFEC inspection can be made much smaller that the pipe diameter. RFEC inspection is commercially available for inspecting small diameter piping without restrictions, several hundred feet at a time. The prototype design described in this paper shows this technology will work in a free-swimming tool that can inspect miles of pipeline at time and bypass restrictions.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Principle of the RFEC technique

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Figure 3

Sensitivity as a function of defect size

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Figure 4

Test jig. The green cylinder is the exciter coil and the sensor carrier is at the back.

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Figure 5

Sensor coils mounted on the sensor carrier of the inspection jig

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Figure 6

Natural corrosion in a 12 in. seamless pipe as measured by the RFEC method

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Figure 7

Photograph of natural corrosion in 12 in. seamless pipe

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