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How Pipeline Pigs Actually Work
Pipeline "pigs" started as straw bundles shoved down lines to sweep them clean — the squealing noise gave them the name. Today's instrumented pigs weigh several tons, carry magnetic and ultrasonic sensors, and find corrosion and cracks in pipe walls buried four feet underground. This episode walks through the whole picture: cleaning pigs versus smart pigs, magnetic flux leakage versus ultrasonic testing, why tight axial cracks defeat standard tools, how inertial navigation tells you which kilometre of buried pipe holds the defect, and what happens when one stops moving. Plus the uncomfortable…
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