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Demonstration of ECDA Applicability and Reliability for Demanding Situations
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Demonstration of ECDA Applicability and Reliability for Demanding Situations
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    Final Report
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    On June 2, 2005, PHMSA issued the fifth Broad Agency Announcement, #DTPH56- 05-BAA-0001, which included research to improve the understanding of Direct Assessment (DA) methods and practices in challenging situations. This project received support from a group of over two dozen gas company participants, some of which contributed pipeline segments for assessment, pipe inspection resources, and excavation and examination costs to demonstrate the assessment technologies (i.e., case study segments/locations). The objective of this project was to support the identification and demonstration of External Corrosion Direct Assessment (ECDA) specific technologies for demanding pipeline situations (e.g., bare pipe, cased and non-cased crossings, and crowded right of ways such as city gate stations). Project emphasis was placed on the use of guided wave ultrasonic testing (GWUT) for these circumstances at the request of all the stakeholders involved in these efforts. The project stakeholder group volunteered the following three high priority situations to focus on for potential case studies: (1) Multiple Pipes (Structures) in Congested Right of Way; (2) Bare Pipe Segments; and (3) Cased Crossings. The following tools were used during the integrity assessments performed during this project: GWUT (GUL and Teletest): torsional and longitudinal signals, pitch-catch and pulse-echo, C-scan, and multiple frequency ranges; magnetic tomography inspection; visual inspection; manual and Porta-Scan UT; radiography (X-ray); Magnetic Particle Inspection (MPI); Close Interval Surveys (CIS); Direct Current Voltage Gradient (DCVG); Pipeline Current Mapper (PCM), native potential and side-drain surveys; and soil resistivity. These three situations resulted in 30 excavations for GWUT application and when combined with the in kind data, included a total of approximately 100 dig sites with fifty-five confirmed (a 100% validation) indications for analysis.

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