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Title: Combined metal loss and crack inspection of a gas pipeline using ultrasound technology
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2100
Date of Publication: March, 2007
Price: $25.00 US
Authors: Roger Vogel et al.
Abstract: ULTRASOUND TECHNOLOGY provides the means to obtain quantitative, highly-accurate, and reliable inspection data for pipelines. Surveying a pipeline for metal loss or cracks has in the past always required the use of different in-line inspection tools and therefore separate runs, including all the associated preparatory work and operational issues. This paper introduces a new in-line inspection tool, based on a special configuration of the modular LineExplorer range of intelligent pigs using ultrasound technology. This configuration enables a pipeline section to be inspected for metal loss and cracks in a single run, incorporating true quantitative wall-thickness measurement. Major advantages are increased efficiency regarding pipeline preparation and cleaning as well as operations during the inspection run.

A major added value to customers is the enhanced data quality, based on the optimized correlation of metal-loss and crack-inspection measurements. The data obtained is ideally suited for advanced integrity assessment and defect-growth analysis.

The paper introduces a case study related to the inspection of a gas pipeline in Canada using this tool. As ultrasound requires a liquid couplant, it was necessary to run the inspection in a suitable liquid batch. This paper describes the related operational procedures. Finally the paper discusses the advantages of using combined inspection technologies and provides an outlook on further developments.

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