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Title: Development of a dual-diameter 10/12-inch high-res. ultrasonic tool
Category: Technical papers from Pipeline World
Downloadable: Yes 
Catalog No.: 889
Date of Publication: June 2005
Price: $25.00 US
Authors: Patrick Viltart and Francois Jacquiot
Abstract: Trapil, one Europe’s leading refined product pipeline operators, has approximately 4,700km of pipeline in three networks in France. The Le Havre-Paris network has a number of dual-diameter 10-in and 12.75-in seamless lines in the Paris region. Built in the 1950s and 1960s, they are now located in heavily-populated areas where excavation to assess defects or perform repairs is difficult. Best in-line inspection practice for this type of line recommends the use of ultrasonic tools because of their depth-sizing accuracy and detection capabilities. The need for a dual-diameter, high-resolution, ultrasonic tool to survey six 10-12.75-in lines prompted Trapil to develop its own tool offering a variety of benefits, such as using the RSTRENG effective-area method to perform fitness-for-purpose calculations prior to excavation, and determining the shape of dents.
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