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51312-01318-In-Line Inspection EMAT Utilizing an Oblique Field

Picture for In-Line Inspection EMAT Utilizing an Oblique Field
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Product Number: 51312-01318-SG
ISBN: 01318 2012 CP
Author: James Simek
Publication Date: 2012
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In-line inspection tools have continued to mature with additional techniques and methods being evaluated for both laboratory conditions and in-line service. In order to achieve adequate detection and quantification for a broad range of features that may represent an integrity threat to operating pipelines several technologies with variants of each have been placed into service. More recently tools employing Electromagnetic acoustic transducers (EMAT) have been introduced for use in measuring wall thickness and for crack detection applications. This paper will discuss the development of an EMAT system using an oblique field arrangement to enhance the system performance by exploiting the increased magnetostrictive effect due to the oblique bias field. Laboratory tests are conducted in samples prepared specifically for EMATS development in addition to samples used in pull tests for a (Magnetic Flux Leakage) MFL development program incorporating both planar or crack like and volumetric features. Response of the EMATS system to a broad category of feature classes is discussed providing insight into the data and results obtained from the modular prototype system highlighting aspects of an EMATS system response to all of the feature types one might expect to encounter in a typical pipeline survey.
In-line inspection tools have continued to mature with additional techniques and methods being evaluated for both laboratory conditions and in-line service. In order to achieve adequate detection and quantification for a broad range of features that may represent an integrity threat to operating pipelines several technologies with variants of each have been placed into service. More recently tools employing Electromagnetic acoustic transducers (EMAT) have been introduced for use in measuring wall thickness and for crack detection applications. This paper will discuss the development of an EMAT system using an oblique field arrangement to enhance the system performance by exploiting the increased magnetostrictive effect due to the oblique bias field. Laboratory tests are conducted in samples prepared specifically for EMATS development in addition to samples used in pull tests for a (Magnetic Flux Leakage) MFL development program incorporating both planar or crack like and volumetric features. Response of the EMATS system to a broad category of feature classes is discussed providing insight into the data and results obtained from the modular prototype system highlighting aspects of an EMATS system response to all of the feature types one might expect to encounter in a typical pipeline survey.
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