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Pigging refers to the practice of using devices known as "pigs" to perform various maintenance operations on a pipeline. This is done without stopping the flow of the product in the pipeline. This can include cleaning and inspecting the pipeline. This is accomplished by inserting the pig into a 'launcher'. The launcher / launching station is then closed and the pressure-driven flow of the product in the pipeline is used to push it along down the pipe until it reaches the receiving trap.