Clough, Matthew, Fleming, Matthew and Dixon, Steve M. (2017) Circumferential guided wave EMAT system for pipeline screening using shear horizontal ultrasound. NDT & E International, 86 . pp. 20-27. doi:10.1016/j.ndteint.2016.11.010 ISSN 0963-8695.

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Abstract

The use of guided waves is now widespread in industrial NDT for locating metal loss in pipelines, that manifests as pitting, corrosion and general wall thinning. In this paper, a screening technique is assessed in terms of defect detection and defect sizing capability. Shear Horizontal (SH) guided waves propagate circumferentially around the pipe whilst the scanner is moved axially along the length. This type of tool is preferable to other methods, being applied to the exterior of the pipe, without requiring full circumferential access, and is able to operate through thin coatings (up to 1 mm thick). It is designed to provide a pipe screening tool for petrochemical pipelines both topside and subsea, particularly for detecting defects at pipe support areas. The system's efficacy in terms of detection and sizing of defects is considered via experimental measurements on artificially induced defects and in service corrosion patches, with results compared to finite element modelling of the interaction of the guided waves with artificial defects. Finite element modelling has been used to better understand the behaviour of different wave modes when they interact with defects, focusing on the mode conversions and reflections that occur.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Nondestructive testing, Electromagnetic testing , Petroleum pipelines
Journal or Publication Title:	NDT & E International
Publisher:	Elsevier Ltd.
ISSN:	0963-8695
Official Date:	March 2017
Dates:	Date Event March 2017 Published 24 November 2016 Available 23 November 2016 Accepted 18 March 2016 Submitted
Volume:	86
Page Range:	pp. 20-27
DOI:	10.1016/j.ndteint.2016.11.010
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	29 November 2016
Date of first compliant Open Access:	24 November 2017
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	EP/F017332/1

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