PIPELINE INSPECTION-1: Line tests confirm ILI tool for SCC detection in gas lines

In summer 1998, TransCanada PipeLines Ltd., Calgary, inspected two sections of a 914-mm (36 in.) OD gas transmission pipeline (predominantly 9.14 mm WT) using an ultrasonic liquid-coupled, crack detection in-line inspection (ILI) tool.One objective of the inspection was to establish the condition of these pipeline sections that had a history of stress-corrosion cracking (SCC).Also under test was the practicability of inspecting a gas line with a liquid-coupled ILI tool, specifically its ability to detect and size defects deeper than 1 mm and distinguish cracks and crack-like defects from other types of anomalies, such as inclusions and laminations.Both sections were inspected in two indep...

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