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Title: A case study of the crack sizing performance of the GE ultrasonic phased-array inspection tool
Category: Pigsource Papers
Downloadable: Yes 
Catalog No.: pg3517
Date of Publication: Feb 1 2010 12:00AM
Price: $25.00 US
Authors: T Hrncir, S Turner, S J Polasik, P Vieth, D Allen, I Lachtchouk, P Senf, and G Foreman
Abstract: GE introduced the first Phased Array Inspection tool to the oil and gas pipeline inspection market in 2005. Since its introduction, the Phased Array inspection tool has inspected 2920 miles (4700 km) of pipelines: a portion of this work has been conducted in Crack Detection mode only, another in a combined ultrasonic wall thickness measurement (UTWM) and ultrasonic crack detection (DUO) mode. This paper focuses on the ultrasonic crack detection (DUO) results.

The case study presented herein involves the ILI survey of a 675 mile (1086km) products pipeline system that was assessed for SCC. Upon review of the ILI survey results, 76 crack-like features were identified and subsequently excavated. Since all anomalies were located on the pipeline’s external surface, the defect sizing capability could be confirmed through an accurate method involving incrementally grinding out the defects. The evaluations were necessary to support the development of an improved sizing algorithm thereby increasing the confidence in reported depths and lengths required for integrity management decisions.

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