Full Content is available to subscribers

Subscribe/Learn More  >

Improved Lateral Focusing for Thin-Walled Gas Pipelines Girth Welds Using Phased Arrays

[+] Author Affiliations
Jinchi Zhang, Simon Labbé

Olympus NDT, Québec, PQ, Canada

Michael Moles

Olympus NDT, Toronto, ON, Canada

Paper No. IPC2006-10238, pp. 209-214; 6 pages
  • 2006 International Pipeline Conference
  • Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
  • Calgary, Alberta, Canada, September 25–29, 2006
  • Conference Sponsors: Pipeline Division
  • ISBN: 0-7918-4263-0
  • Copyright © 2006 by ASME


With the arrival of high strength, thinner walled pipe steels, improved defect sizing is becoming more critical. Repairs become more detrimental to the pipe material properties, and Engineering Critical Assessment requires better sizing as the pipes become thinner. Improved focusing is particularly relevant in the horizontal (circumferential) direction, to both minimize repairs and to more accurately characterize intermittent defects. This paper describes the development of an ultrasonic phased array specifically to improve focusing. Extensive computer modeling was performed to determine the optimum array for thin-walled pipes with mechanical focusing (i.e. a curved array) and various curvatures. The modeling showed that a 60 element, 1 mm pitch array with a 100 mm curvature in the passive aperture gave significant improvements over a standard array (60 elements, 1 mm pitch, unfocused). This curved array was manufactured and tested on a commercial calibration block with flat bottomed holes. The experimental results showed that the curved 1D array had significantly better focusing than the standard (unfocused) array, as expected. The curved array oversized flat-bottom hole reflectors by only ∼ 1 mm, instead of the 4–6 mm from the standard array. These curved arrays can be used on standard AUT systems with no modifications to the general mechanics or software.

Copyright © 2006 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In