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PROPER REPORTING OF GUIDED WAVE STRUCTURAL HEALTH MONITORING:PER-INDICATION DOCUMENTATION, CALIBRATED REFLECTION COEFFICIENT, AND MODE CONFIRMATION IN MAGNETOSTRICTIVE SENSOR PIMS REPORTS
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1  Guided Wave Analysis LLC, San Antonio, Texas, USA
Academic Editor: Fabio Tosti

Abstract:

Magnetostrictive sensor (MsS) permanently-installed monitoring systems (PIMS) provide long-range guided wave structural health monitoring for buried, insulated, and inaccessible pipelines using the nondispersive T(0,1) torsional mode. While the physical performance of MsS PIMS — including high spatial resolution, multi-frequency operation, and calibrated signal amplitude — represents a significant technical advantage over competing technologies, the reporting of GWT monitoring data has not kept pace with the technical capabilities of the method. Three systematic reporting gaps are identified and examined: (1) the absence of per-indication report pages, which leaves clients without dedicated documentation for each monitored feature; (2) the presentation of monitoring amplitude data without a physically calibrated y-axis in units of reflection coefficient; and (3) the absence of spectrogram evidence for T(0,1) mode confirmation and dispersion curve analysis on a per-indication basis. This paper describes the extension of the per-indication reporting framework introduced in GIM (Guided Wave Inspection and Monitoring) software v7.0 for pipeline inspection to the GWT structural health monitoring workflow. A three-phase field installation on a 12.75-inch-OD, 0.700-inch-wall buried FBE-coated pipeline demonstrates both the current GIM v6 reporting practice and the specific elements that remain outside the report under that practice: dead zone artifact identification, mirror reflection analysis, and the T(0,2) cut-off frequency analysis (91.39 kHz for the 0.700-inch wall) that explains frequency selection. The post-installation baseline report was assessed by a senior technical reviewer as excellent — yet none of the physically essential per-indication elements are embedded in it. The improvements enabled by GIM v7.0 are argued to be a necessary step toward the documentation standards expected from structural health monitoring programs in the pipeline industry.

Keywords: guided wave testing; structural health monitoring; MsS PIMS; pipeline monitoring; T(0,1) mode; per-indication documentation; spectrogram; reflection coefficient; GIM software; pipeline integrity; buried pipeline

 
 
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