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Alaska Pipeline, Fairbanks, AK: Pigs in the Pipeline: Devices called "Pigs" improve the flow of oil through the trans Alaskan pipeline, and monitor the condition of the pipeline. Pigs are launched and retrieved at stations and flow through the pipeline with the oil. This is a cleaning and flow improvement pig. Other, more sophisticated pigs use magnetic fields and ultrasonic signals to detect small changes in the pipe wall's thickness and shape.